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Publisher: Springer-Verlag   (Total: 2329 journals)

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Showing 1 - 200 of 2329 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 19, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 9, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 18, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 5, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 2, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 22, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 7, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 10, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 5, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 14, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 3)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 6, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 10, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 5, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 18, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 4, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 6, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 3, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 9, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 20, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 14, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 34, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 2)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 52, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 23, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 40, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 1, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 8, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 14, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agriculture and Human Values     Hybrid Journal   (Followers: 12, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 20, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 10, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 7, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 3, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 2, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 7, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 4, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 14, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 10, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 24, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 7, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 11, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 21, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 11, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 7, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 5, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 4, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal  
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 4)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 28, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 15, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 12, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 8)
Annals of Dyslexia     Hybrid Journal   (Followers: 9, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 4, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 13, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 9, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 8, SJR: 1.186, h-index: 78)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 11, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 7, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.267, h-index: 26)
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 46, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 2, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 7, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 14, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 4, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 61, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 7, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 23, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 6, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 15, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 22, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 30, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 3, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 12, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 21, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 52, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4, SJR: 0.865, h-index: 40)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 6, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 10, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 16, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 9, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 16, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 13, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 1, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 15, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 4, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 9, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 11, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 11, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 7, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 7)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 21, SJR: 4.511, h-index: 44)
Astronomy Letters     Hybrid Journal   (Followers: 19, SJR: 0.58, h-index: 30)
Astronomy Reports     Hybrid Journal   (Followers: 12, SJR: 0.473, h-index: 23)
Astrophysical Bulletin     Hybrid Journal   (Followers: 2, SJR: 0.469, h-index: 11)

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Journal Cover Aquaculture International
  [SJR: 0.613]   [H-I: 40]   [22 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1573-143X - ISSN (Online) 0967-6120
   Published by Springer-Verlag Homepage  [2329 journals]
  • Technical efficiency measurement of mussel aquaculture in Greece
    • Authors: Alexandros Theodoridis; Christos Batzios; Athanasios Ragkos; Panagiotis Angelidis
      Pages: 1025 - 1037
      Abstract: In this study, the non-parametric data envelopment analysis was applied in a sample of 66 mussel aquaculture farms for the estimation of the level of technical efficiency. The differences in this estimated level of efficiency were investigated through the application of a Tobit regression model and a technical and economic descriptive analysis provided an indicative picture of the structure and the economic performance of the efficient farms. The results indicated significant inefficiencies in the utilization of the existing production technology. The estimated mean technical efficiency was 0.761, indicating that the mussel farms could increase their production by 23% given the level of inputs. Moreover, the results of the Tobit regression model showed that socio-demographic variables, such as farmer’s age, experience in aquaculture, vocational training, and level of education, can partly explain the efficiency differentials. The technical and economic analysis showed that the efficient mussel farms compared to the inefficient farms are larger in size, use less labor per hectare of sea area, and achieve higher net profit.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0092-z
      Issue No: Vol. 25, No. 3 (2017)
       
  • An economic analysis of hard clam ( Meretrix meretrix ) farmer polyculture
           with milkfish ( Chanos chanos ), silver sea bream ( Rhabdosargus sarba ),
           and shrimps at different hard clam stocking densities: a case study of
           Yunlin County, Taiwan
    • Authors: Chun-Yuan Yeh; Jung-Fu Huang; Jie-Min Lee; Christian Schafferer
      Pages: 1039 - 1055
      Abstract: This study uses a translog cost function model based on two different hard clam stocking densities to estimate the cost and price elasticity of input factors to evaluate whether the hard clam polycultures in Yunlin County, Taiwan, have economies of scale and economies of scope and to assess the substitutability between inputs. The study found that farmers with hard clam stocking densities higher than 1,500,000 individuals/ha (high-density farmers) generated more profit than farmers with stocking densities below 1,500,000 individuals/ha (low-density farmers), because they experienced lower average costs and higher production outputs. Moreover, the own price elasticity of labor input (−1.162) was more responsive to price changes for high-density farmers than for low-density farmers. That is, wage increases have a significant effect on reducing labor demand for high-density farmers. For these farmers, the Allen partial cross-price elasticities of the variable inputs labor-seed and labor-feed were 1.973 and 2.326, respectively. These positive elasticities indicate that labor-seed and labor-feed are substitutes. That is, increases in seed and feed prices could be compensated for by increasing labor inputs for high-density farmers. This study established the existence of constant overall scale economies and economies of scope for high- and low-density farmers. In addition, the study suggests that hard clam farmers with fish and shrimp polycultures consider cost complementarities and product-specific economies of scope at various levels of production. Low-density farmers are also advised to increase the milkfish population in their polycultures, whereas high-density farmers might increase silver sea bream and shrimp densities.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0094-x
      Issue No: Vol. 25, No. 3 (2017)
       
  • Effect of dietary green tea supplementation on growth, fat content, and
           muscle fatty acid profile of rainbow trout ( Oncorhynchus mykiss )
    • Authors: Thomas L. Welker; Xiao-chun Wan; Yi-bin Zhou; Yan-ou Yang; Ken Overturf; Frederic Barrows; Keshun Liu
      Pages: 1073 - 1094
      Abstract: Improved fat metabolism and reduced body fat have been observed in aquatic and terrestrial animals fed diets supplemented with green tea. Rainbow trout cultured commercially often contain high levels of body and visceral fat, which is linked to reduced yield and added difficulties in processing. Reducing fat levels is of interest to commercial trout producers. In this study, three varieties of green tea were supplemented into feed at 0, 1, 2, and 4% of diet and fed to rainbow trout (34.4 ± 1.5 g initial weight) in triplicate tanks containing 50 fish each. At the end of 60 days, fish were sampled to determine effects on growth performance, fat content (whole body and intraperitoneal (IP)), and muscle fatty acid (FA) profile. Trout fed the highest level (4%) of green tea had an improved muscle FA profile (lower saturated FA and higher polyunsaturated FA) and reduced IP fat content (1.5 ± 0.13% whole body weight) compared to the basal diet (2.0 ± 0.17). However, these fish also had lower weight gain (71.9 ± 11.3 versus 93.2 ± 4.28 g for the basal diet). These effects did not appear to be caused by reduced feed intake, which was significantly higher for trout fed the 4% tea diet (2.21% body weight day−1) in contrast to the other diets (approximately 1.9% body weight day−1). It is unclear why the IP fat content and growth performance declined, but it may be related to lower fat digestibility in the gut or increased fat metabolism from dietary supplementation of green tea.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0099-5
      Issue No: Vol. 25, No. 3 (2017)
       
  • An overview of motile Aeromonas septicaemia management
    • Authors: Deyan Stratev; Olumide A. Odeyemi
      Pages: 1095 - 1105
      Abstract: Motile Aeromonas septicaemia is most commonly caused by Aeromonas hydrophila. It is an opportunistic pathogen causing disease in fish under stress. The bacterium produces a number of pathogenic factors, and the most important among them are the haemolysin and the aerolysin, provoking the disease. Freshwater and saltwater fish species are susceptible. The disease is manifested clinically with haemorrhages, ulcerations, abscesses, ascitic fluid and anaemia. Mortality rates are high, and they incur substantial economic losses, thereby necessitating timely measures of control for prevention and treatment. Therefore, the aim of this overview was to provide up-to-date information related to the control of motile Aeromonas septicaemia in fish through application of chemotherapeutic drugs, phytobiotics, probiotics, yeast extracts, vaccines and disinfectants.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0100-3
      Issue No: Vol. 25, No. 3 (2017)
       
  • Effect of Cynodon dactylon extract on white spot virus-infected
           Litopenaeus vannamei
    • Authors: O. Tomazelli Junior; F. Kuhn; P. J. Mendonça Padilha; L. R. Mota Vicente; S. Winckler da Costa; B. Corrêa da Silva; D. Dias Schleder; A. A. Boligon; J. Scapinello; C. Nunes Nesi; J. Dal Magro; S. De Lamo Castellví
      Pages: 1107 - 1122
      Abstract: The objectives of this research were to study the phytochemical composition of Cynodon dactylon and investigate if the oral administration of this plant extract adsorbed on the pellet feed was capable of protecting L. vannamei challenged with white spot syndrome virus (WSSV). The shrimps were distributed into five batches, and experiments were run by triplicate: uninfected shrimps fed with pelleted feed without ethanolic extract of C. dactylon (ECDE, TC), infected shrimps fed with pelleted feed without ECDE (T1), infected shrimps fed with 1% of ECDE (T2), infected shrimps fed with 2% of ECDE (T3), and infected shrimps fed with 4% of ECDE (T4). The phytochemical screening of ECDE showed several compounds such as with important biological activities consistent with the results observed in vivo. Treatment with 2% ECDE showed a protective effect against WSSV and survival of 62% with no clinical signs of infection.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0101-2
      Issue No: Vol. 25, No. 3 (2017)
       
  • Lipidomic profiling of juvenile yellow head catfish ( Pelteobagrus
           fulvidraco ) in response to Fucoidan diet
    • Authors: Panpan Xu; Yajun Wang; Juanjuan Chen; Rui Yang; Qicun Zhou
      Pages: 1123 - 1143
      Abstract: Yellow head catfish, Pelteobagrus fulvidraco, with delicious meat and high commercial value has relatively high lipid accumulation which is considered to be a major problem in aquaculture. It was found that fucoidan has the functions in reducing lipid concentration and enhancing the immunity capability. The purpose of this study is to understand the role of fucoidan in juvenile yellow head catfish and the underlying comprehensive lipid metabolic regulation. The overall changes of significant lipid biomarkers in juvenile yellow head catfish fed on 0.1% fucoidan at different time points were studied by ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-ESI-Q-TOF-MS) and multivariate statistical analysis. At the eighth week, the lipid profile had the largest difference between the two groups, with 10 lipids identified as potential lipid biomarkers. Lysophosphatidylcholine (Lyso-PC), phosphatidylcholine (PC), and phosphatidylethanolamine (PE) were elevated, while triglycerides (TAGs) were reduced in SF group compared to C group. Overall, the content of free fatty acids (FFAs), derived from TAG, was decreased, whereas that of total fatty acids (TFAs) derived from FFAs showed the opposite tendency. Fucoidan can reduce the content of triglyceride perhaps by altering the activities of related enzymes and improve immunity capability of the juvenile yellow head catfish through increasing the whole levels of related fatty acids, which may be useful for facilitating efficient development and scientific improvement of fishery.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0102-1
      Issue No: Vol. 25, No. 3 (2017)
       
  • Enclosure experiment of effects of dietary phosphorus level on water
           quality, phosphorus budget, and plankton composition in intensive culture
           of crucian carp
    • Authors: Yiyi Sun; Minghai Chen; Chongmin Kong; Huijuan Tang; Lian Gan; Min Zhang
      Pages: 1145 - 1158
      Abstract: Enclosure experiment was carried out to evaluate the effects of dietary phosphorus levels on water quality, phosphorus budget, and plankton composition in intensive culture of crucian carp (Carassius auratus). Monocalcium phosphate was used to formulate extruded feed containing total phosphorus of 8.7 (D1), 11.4 (D2), 13.5 (D3), and 18.4 (D4) g kg−1. Twelve polyethylene enclosures (each 4 × 4 × 1.5 m depth) were assigned to four groups with each one stocked with 120 juveniles (44.08 ± 1.36 g). Fish was fed twice daily at a rate of 3% body weight in the experiment. After 70 days of feeding, growth and survive rate of crucian carp were not affected by diet of different P level. It was found that physiochemical factors in all the enclosures did not show obvious threat on fish. Diets of different P level did not affect dissolved oxygen (DO), secchi depth (SD), total ammonium nitrogen (TAN), and total nitrogen (TN) concentration in enclosures. However, increased diet P level seemed to increase averaged pH, soluble reactive phosphorus (SRP), and total phosphorus (TP) concentration and decrease nitrite concentration and TN/TP. During later period of experiment, treatments with high diet P level (D3 and D4 treatments) had very high cyanobacterial biomass dominated by Microcystis spp., while phytoplankton in D1 and D2 treatments was mainly composed of edible algae. Composition and density of zooplankton in different treatments varied in similar pattern. Peak density of cladocerans (mainly Moina spp.) seemed to be related to diet P level. The present study indicated that changing P level in diets might bring complicated changes to the intensive crucian carp culture ecosystem.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0103-0
      Issue No: Vol. 25, No. 3 (2017)
       
  • A molecular tool for parentage analysis in Indian major carp, Labeo rohita
           (Hamilton, 1822)
    • Authors: L. Sahoo; P. K. Meher; K. Das Mahapatra; J. N. Saha; P. Jayasankar; P. Das
      Pages: 1159 - 1166
      Abstract: Determination of genealogical relationship between broodstock and progeny is important to estimate selection response in aquaculture breeding programs. Currently, the application of microsatellite markers for parentage determination is gaining popularity in aquaculture. In the present study, 17 simple sequence repeat markers were evaluated for parentage assignment on rohu. The allele frequencies, exclusion probabilities and polymorphic information contents (PIC) were calculated using Cervus. The polymorphic information content values showed that most of the microsatellite markers were highly informative (PIC > 0.7). Based on the exclusion power, eight microsatellite markers were chosen for parentage assignment. The robustness of this suite was assessed in five full-sib and four half-sib families using two contrasting methods, a pair-wise likelihood comparison approach in Cervus and a full-pedigree likelihood method in the COLONY program. Using real data set, the correct matching rate was more than 98%, comparable to the simulated study (99.9%) in the case of Cervus 3.0 and 100% in the case of COLONY. The result of the present study implies that this set of microsatellites would be an effective tool for parentage and sibship identification, testing performance of families and estimating genetic parameters in the ongoing selective breeding program of rohu.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0104-z
      Issue No: Vol. 25, No. 3 (2017)
       
  • Biopotentiality of Bacillus cereus PB45 for nitrogenous waste
           detoxification in ex situ model
    • Authors: Prasenjit Barman; Ahmet Kati; Amit Kumar Mandal; Partha Bandyopadhyay; Pradeep Kumar Das Mohapatra
      Pages: 1167 - 1183
      Abstract: A bacterial strain PB45 was isolated from an intensive shrimp culture pond, and its nitrification capability was studied. On the basis of 16S ribosomal DNA (rDNA) analysis, strain PB45 was identified as Bacillus cereus PB45. PB45 has the potential to remove \( {NH}_4^{+}-\mathrm{N} \) , \( {\mathrm{NO}}_3^{-}-\mathrm{N} \) , and \( {\mathrm{NO}}_2^{-}-\mathrm{N} \) at the rates of 66.6, 79.4, and 50%, respectively. The optimum pH, temperature, and dissolved oxygen for the highest nitrification process of the PB45 were 8.0, 30 °C, and 6.68 mg/l (200 rpm), respectively. PB45 could express periplasmic nitrate reductase (napA), hydroxylamine oxidoreductase (hao), and nitrite reductase (nirS) which are essential to complete heterotrophic nitrification and aerobic denitrification process. Removal of \( {NH}_4^{+}-\mathrm{N} \) , \( {\mathrm{NO}}_3^{-}-\mathrm{N} \) , and \( {\mathrm{NO}}_2^{-}-\mathrm{N} \) in an aquarium base shrimp wastewater system was recorded to be 99.76, 99.37, and 99.72%, respectively, by PB45. This result indicated that PB45 has the prospect for future full-scale application in commercial shrimp culture.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0105-y
      Issue No: Vol. 25, No. 3 (2017)
       
  • Biofloc technology: an emerging avenue in aquatic animal healthcare and
           nutrition
    • Authors: Irshad Ahmad; A. M. Babitha Rani; A. K. Verma; Mudasir Maqsood
      Pages: 1215 - 1226
      Abstract: Biofloc is a conglomeric aggregation of microbial communities such as phytoplankton, bacteria, and living and dead particulate organic matter. Biofloc technology involves manipulation of C/N ratio to convert toxic nitrogenous wastes into the useful microbial protein and helps in improving water quality under a zero water exchange system. It may act as a complete source of nutrition for aquatic organisms, along with some bioactive compounds that will enhance growth, survival, and defense mechanisms, and acts as a novel approach for health management in aquaculture by stimulating innate immune system of animals. Nutritionally, the floc biomass provides a complete source of nutrition as well as various bioactive compounds that are useful for improving the overall welfare indicators of aquatic organisms. Beneficial microbial bacterial floc and its derivative compounds such as organic acids, polyhydroxy acetate and polyhydroxy butyrate, could resist the growth of other pathogens, thus serves as a natural probiotic and immunostimulant. The technology is useful in maintaining optimum water quality parameters under a zero water exchange system, thus prevents eutrophication and effluent discharge into the surrounding environment. Moreover, the technology will be useful to ensure biosecurity, as there is no water exchange except sludge removal. The technology is economically viable, environmentally sustainable, and socially acceptable.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0108-8
      Issue No: Vol. 25, No. 3 (2017)
       
  • Effect of dietary phytase on phosphorus use efficiency and dynamics in
           aquaponics
    • Authors: Brunno da Silva Cerozi; Kevin Fitzsimmons
      Pages: 1227 - 1238
      Abstract: Phytase is a phosphatase enzyme used as dietary supplement when significant portions of plant-based ingredients are used in fish feed formulations. This work thus assessed the effects of a phytase-supplemented diet on the P dynamics, P availability, P budget, fish and plant growth parameters, and carcass composition of Nile tilapia and phosphorus content of lettuce plants in aquaponic systems. The diet supplemented with phytase at the concentration of 1000 FTU kg−1 showed a significant increase in released phosphorus compared to the control in an in vitro assay. Phytase supplementation increased accumulation of phosphorus in fish carcass compared to the control, but did not affect growth performance. The addition of phytase to fish diets improved phosphorus utilization by fish, reducing phosphorus excretion. The lower amount of phosphorus excreted in the water caused by phytase did not impair the growth or phosphorus content of lettuce grown using the aquaponic nutrient solution. It is recommended that, even though the use of phytase in fish feeds increased the overall utilization of phosphorus in the present study, a small portion of inorganic phosphorus must be supplemented to meet minimum fish requirements.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-016-0109-7
      Issue No: Vol. 25, No. 3 (2017)
       
  • Use of agar-bound microparticulate diet as alternative food for tropical
           abalone, Haliotis asinina (Linnaeus 1758) post-larvae in large-scale
           cultures
    • Authors: MN Bautista-Teruel; JRH Maquirang; MR dela Peña; VT Balinas
      Pages: 1239 - 1252
      Abstract: The efficacy of using agar-bound microparticulate diet (A-MPD) as alternative food for abalone Haliotis asinina Linne post-larvae in large-scale culture was investigated. Larvae sourced from the hatchery-bred (HB) and wild-sourced (WS) broodstock were fed with either diatoms (TMT1-NF), agar-bound microparticulate diet (TMT2-A-MPD), or a combination of both feeds (TMT3-NF + A-MPD) in six 2-m3 tanks replicated over time. Three hundred thousand veliger larvae were stocked/tank containing 80 corrugated plates with mucus trails hanging on bamboo poles. Feeds were given at 0900 h starting at day 3 with seawater flow through introduced every 1400 h starting day 5. Two-way analysis of variance determined significant differences (p < 0.05) in survival and shell length between larval sources and feed types. Tukey’s post hoc test established differences among treatment means. At day 30, survival for HB- and WS-sourced larvae was significantly higher (42%) in TMT3 compared with TMT2 having 35% for HB and 38% for WS (p < 0.05). Larvae fed with TMT1 had significantly lowest survival among the three treatments. Survival at 60 and 90 days did not show significant difference for TMT2 and TMT3 regardless of broodstock source. Post-larval shell growth (90 days), from both sources fed with TMT2 and TMT3, was significantly higher than TMT1 (p < 0.05). Larval performance did not show any significant interactions between HB and WS broodstock. The use of A-MPD alone or in combination may elicit improvement in survival and shell length growth in abalone larvae regardless of larval sources. A-MPD may be used as full or partial replacements to diatoms as alternative food for abalone post-larvae in large-scale culture.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0110-9
      Issue No: Vol. 25, No. 3 (2017)
       
  • Economic profitability of tilapia farming in China
    • Authors: Yuan Yuan; Yongming Yuan; Yunyun Dai; Yunchong Gong
      Pages: 1253 - 1264
      Abstract: Tilapia is an internationally farmed trade species recommended by the United Nations Food and Agriculture Organization, which is promoted and farmed in more than 100 countries and regions. In China, tilapia culture is a promising aquaculture business and it occupies an important position in global tilapia culture. In this study, profitability analysis was used to analyze the production costs and economic benefits of different farming sizes among the main tilapia-producing areas of China. Sensitivity analysis was conducted to analyze the impact of uncertainty factors on net profit of tilapia farming. Details of the costs and benefits of tilapia culture in China could support financial planning by fish farmers. The economic profit indices measured in this study comprised the total profit, gross income, profit margin, and benefit-cost ratios. The results indicated that large farms has the highest cost and the highest cost-profit margin among the three categories, and the small farms has the lowest cost and profit margin, while the cost and profit margin of medium size are between the large and small sizes. Sensitivity analysis shows that the net profit of tilapia is very flexible to the change of price, feed, rent, and fixed cost, of which price elasticity was the highest, followed by the feed, rent, and fixed cost. According to the problems existing in the tilapia farming, some policy suggestions were put forward for sustainable tilapia culture.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0111-8
      Issue No: Vol. 25, No. 3 (2017)
       
  • Influence of low molecular weight chitooligosaccharides on growth
           performance and non-specific immune response in Nile tilapia Oreochromis
           niloticus
    • Authors: Xiao Meng; Jiting Wang; Wenju Wan; Mengmeng Xu; Tingting Wang
      Pages: 1265 - 1277
      Abstract: A 50-day feeding trial was conducted to evaluate the effects of five different levels of low molecular weight chitooligosaccharides (LMW-COS) (0, 0.1, 0.2, 0.4, and 0.8 g kg−1) on growth performance, serum parameters, body composition, and non-specific immunity in Nile tilapia (Oreochromis niloticus). A total of 600 fish were divided into 5 treatments with 4 replicates of 30 fish per tank. The results showed that dietary supplementation with 0.4 or 0.8 g kg−1 COS significantly improved the final body weight, specific growth rate, feed efficiency rate, and protein efficiency ratio of fish (P < 0.05). The supplementation of COS did not significantly affect the content of blood albumin, globin, and glucose, but the trend of enhancing blood total protein and lowering cholesterol and triglyceride was observed with the gradient levels of COS. Immune responses assay showed that dietary supplementation with 0.4 or 0.8 g kg−1 COS significantly improved the phagocytic activity, serum bactericidal activity, and lysozyme activity in tilapia (P < 0.05); there were no significant differences between 0.4 and 0.8 g kg−1 of COS (P > 0.05). In one word, the supplementation of 0.4 and 0.8 g kg−1 COS significantly increased the growth performance and non-specific immunity of Nile tilapia; the recommended COS supplementation in diet is 0.4 g kg−1 diet.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0112-7
      Issue No: Vol. 25, No. 3 (2017)
       
  • Cultivation of green algae Platymonas helgolandica in rearing water
           enhances the growth performance and resistance of Litopenaeus vannamei
           against Vibrio parahaemolyticus infection
    • Authors: Hongxing Ge; Jian Li; Ping Chen; Zhiqiang Chang; Mingming Shen; Fazhen Zhao
      Pages: 1279 - 1290
      Abstract: Platymonas helgolandica Kylin var. tsingtaoensis, a unicellular free-swimming marine green alga, is widely distributed in certain areas of Asia and frequently used in larvae rearing in marine animal hatchery. To investigate the potential regulatory roles of P. helgolandica in white shrimp (Litopenaeus vannamei) culture, P. helgolandica was seeded in water for rearing white shrimp at three different doses of 1 × 104 (T1), 5 × 104 (T2) and 1 × 105 (T3) cell mL−1 and control without any microalgae for 40 days, and water quality, innate non-specific immune responses (including total hemocyte count (THC), phenoloxidase activity (PO), lysozyme (LSZ), and superoxide dismutase (SOD) activity), shrimp growth performance and shrimp survival rate under Vibrio parahaemolyticus exposure were examined. All the three treatments seeded with P. helgolandica showed a significant reduction of ammonia, nitrite and nitrate. Water pH in each tanks seeded with P. helgolandica tended to increase during the experiment, whereas water pH in the control tanks tended to fluctuate over time. Compared with the control group, final weight, average weight gain and feed conversion ratio (FCR) were significantly greater in T1, T2 andT3. The THCs of the T3 group were significantly higher than that of the control. SOD activities of the shrimp in T2 and T3 groups were significant higher than those of the shrimp in the control. The PO activity of the T3 group was significantly higher than those of the control and the T1 group. On day 10, the survival rate (percent) of L. vannamei under V. parahaemlyticus exposure were 66.67, 81.11 and 91.11% in T1, T2 and T3 respectively, whereas, it was 43.33% in the positive control. These results suggest that seeded P. helgolandica in the rearing water of white shrimp confers positive effects for shrimp aquaculture, considering water quality, growth performance, innate non-specific immune responses and disease resistance. Among the three doses of P. helgolandica, 1 × 105 cell mL−1 had the best effect on shrimp growth performance and resistance against V. parahaemolyticus infection.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0113-6
      Issue No: Vol. 25, No. 3 (2017)
       
  • Evaluation of different hydroponic media for mint ( Mentha arvensis ) with
           common carp ( Cyprinus carpio ) juveniles in an aquaponic system
    • Authors: A.P. Shete; A.K. Verma; N. K. Chadha; Chandra Prakash; M.H. Chandrakant; K. K. T. Nuwansi
      Pages: 1291 - 1301
      Abstract: Three hydroponic media crushed stones (T1), river stones (T2), and floating raft (T3) were compared in an aquaponic system with common carp (Cyprinus carpio) and mint (Mentha arvensis). Fish effluents were used as plant nutrients while plants filtered water by stripping off the nutrients before returning to the fish tank. Fish growth, plant growth, and water quality parameters were used to evaluate the suitability of three different media. Growth performance of common carp and mint followed the relationship of crushed stones > floating raft > river stones with significant difference observed among all treatments. Total ammonia nitrogen (TAN) removal varied significantly among different treatments. The maximum TAN removal was observed in T1 (77.13%) followed by T3 (69.65%), and the minimum removal was observed in T2 (48.82%). Nitrate removal varied significantly among different treatments. The highest removal was observed in T1 (82.95%) followed by T3 (68.04%) and T2 (59.51%). Removal of phosphate was significantly lower in T2 (50.12%) when compared to T1 (67.85%) and T3 (70.71%). Biofilter performance (g m−3 day−1) of T2 (4.80) was significantly lower compared to T1 (7.13) and T3 (7.37). Crushed stone and floating raft were significantly efficient when compared to river stone medium in terms of nutrient removal and water quality maintenance for the fish culture. Considering all growth parameters, crushed stone media proved to be better when compared to other two media. Thus, medium selection could be a considerable factor when designing an aquaponic system.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0114-5
      Issue No: Vol. 25, No. 3 (2017)
       
  • Effects of Astragalus polysaccharides on antioxidant abilities and
           non-specific immune responses of Chinese mitten crab, Eriocheir sinensis
    • Authors: Longlong Fu; Gang Zhou; Jianlin Pan; Yuehua Li; Quanping Lu; Jun Zhou; Xuguang Li
      Pages: 1333 - 1343
      Abstract: This study assessed the effects of Astragalus polysaccharides (APS) on antioxidant abilities, non-specific immune responses, and immune protective efficacy (attacked by Aeromonas hydrophila) of Eriocheir sinensis, the most important Chinese freshwater crabs. A total of 720 crabs (initial mean weight 10.27 ± 1.58 g) were fed 60 days with six kinds of experimental diets containing graded dosages of APS (0, 300, 600, 900, 1200, 1500 mg/kg diets) in 18 outdoor cement tanks. The results showed that superoxide dismutase (SOD), catalase (CAT), total antioxidant capacity (T-AOC), lysozyme (LZM), and phenoloxidase (PO) activities of serum significantly increased (P < 0.05) with increasing APS dosages (0–900 mg/kg diets), but alkaline phosphatase (AKP) and acid phosphatase (ACP) activities of serum did not significantly changed (P > 0.05); SOD, CAT, T-AOC, LZM, AKP, and ACP activities of hepatopancreas significantly increased (P < 0.05) with increasing APS dosages (0–1200 mg/kg diets); the increased maximal multiples of LZM and PO activities were higher than SOD, CAT, and T-AOC which increased. The results of A. hydrophila attack test showed that mortality rates significantly decreased (P < 0.05) with increasing APS dosages (0–600 mg/kg diets), and the highest immune protective rate was 49.4%. In short, APS could help E. sinensis to improve immune responses and may reduce the risk of disease attacks as one kind of effective immunopotentiator in diets, and the best additive dosage was 1200 mg/kg.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0117-2
      Issue No: Vol. 25, No. 3 (2017)
       
  • Analysis of monthly variation of biological conditions, metabolic
           parameters and antioxidative capacities in sea-based farmed Pacific
           abalone during summer days
    • Authors: Siheng Lin; Fucun Wu; Guofan Zhang
      Pages: 1345 - 1359
      Abstract: Pacific abalone, Haliotis discus hannai, has become the predominant farmed abalone species in Fujian, southern China, since 2006. As an introduced abalone species from northern China, mass mortality of the farmed Pacific abalones in Fujian often occurred during summer in recent years. However, this phenomenon of summer mortality still lacks thorough investigation. We conducted a field investigation to monitor biological conditions of the 2-year-old animals, including monthly survival rates; visual gonad index; monthly variation in metabolic parameters including protein, glycogen, and nonesterified fatty acid (NEFA) content; and enzyme activities of lactate dehydrogenase (LDH) and antioxidative capacities including superoxide dismutase (SOD) and total antioxidative capacity (T-AOC) from April to October 2014. A range of environmental parameters were assessed and correlated against biological indicators for abalone conditions, metabolic parameters, and antioxidative capacities. Results showed a total mortality rate of 58.58% over the sampled period. Visual gonad index assessment showed that the sampled animals had similar gonad development levels during each sampling date. Environmental parameters and abalone mortality monitored during the study showed significant positive correlation between seawater temperature and mortality of abalones. All energy resources tended to be depleted at the end of summer. Results also showed that both SOD and T-AOC increased in the first few months and then decreased in September and October. The variations of metabolic parameters and antioxidative capacities indicated an insufficient energy supply and peroxidative damage in the farmed animals during summer. This study provided the biological data of farmed Pacific abalone by field investigation in terms of summer mortality for the first time in southern China. These findings that might be applicable to the management and development of Pacific abalone aquaculture in sea-based farms of southern China were also discussed in the study.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0118-1
      Issue No: Vol. 25, No. 3 (2017)
       
  • Effects of different feeding rates of extruded and pelleted feeds on
           growth and nutrient retention in channel catfish ( Ictalurus punctatus )
    • Authors: Huaibing Xu; Xiaoqin Li; Wentong Sun; Jianan Chen; Qipin Gao; Ke Shuai; Xiangjun Leng
      Pages: 1361 - 1372
      Abstract: Extruded and pelleted feeds were fed with different amounts (100, 90, 80, and 70% of satiation) to channel catfish (42 g initial weight) and the effects on growth, nutrient retention, and serum biochemistry were examined. The two feeds were designed with the same formula (containing 308 g kg−1 crude protein and 53 g kg−1 crude lipid), and were fed to eight treatments of fish (pelleted feed with a satiation of 100, 90, 80, 70% and extruded feed with a satiation of 100, 90, 80, 70%) with triplicate cage per treatment (20 fish per cage) for 10 weeks. The results indicated that weight gain (WG) of the eight groups were 371.1, 328.1, 302.1, 281.1 and 370.5, 334.0, 311.0, 285.3%, respectively. The fish fed extruded and pelleted feed at the same feeding rate showed no significant differences in growth performance, whole-body composition, and nutrient retention (P > 0.05). In both extruded and pelleted feeds, WG, feed conversion ratio (FCR), intraperitoneal fat ratio (IFR), whole-body lipid content, lipid retention (LR), and serum triglyceride (TG) content decreased (P < 0.05), but protein retention (PR) increased from 35.3 to 39.4% in pelleted feeds and from 35.9 to 39.7% in extruded feeds with the decrease of feeding rate from satiation (100%) to 70% of satiation (P < 0.05). The above results demonstrated that channel catfish fed extruded feed had the similar growth to that fed pelleted feed with the same formula. The utilization of protein and feed could be improved by the reduced feeding rate from satiation (100%) to 70% of satiation.
      PubDate: 2017-06-01
      DOI: 10.1007/s10499-017-0119-0
      Issue No: Vol. 25, No. 3 (2017)
       
  • Hormonal sex reversal in red tilapia ( Oreochromis niloticus and
           Oreochromis mossambicus ) and inheritance of body colour in O. mossambicus
           and red tilapia: implications for commercial farming
    • Authors: N. Basavaraja; C. H. Raghavendra
      Abstract: The present investigation was conducted with a view to produce a female-free population and to test the heredity of body colour in tilapia. In this study, 6-day-old red tilapia were fed diets incorporated with 0, 25, 50, 75 and 100 mg/kg diet of a synthetic androgen, 17α-methyltestosterone (17α-MT), for 30 days. Administration was followed by 120 days of rearing in nylon hapas where hormone-free diet was given. At the end of the 120-day rearing, 17α-MT at 50 ppm induced 100% sex reversal, whereas 25, 75 and 100 mg/kg resulted in incomplete sex reversal. Immersion of newly hatched red tilapia fry in an aqueous solution of 17α-MT at 200 μg/L for 1 h produced 73% males; however, when given to 2-day-old fry, it yielded 78% males. The results indicate that oral administration of 17α-MT is more effective than treatment by immersion to produce male dominant red tilapia populations. Treatment of red tilapia with the androgen did not indicate any definite trend in the gonado-somatic index of both males and females. The results of progeny testing indicate that red tilapia does not belong to either XX-XY or WZ-ZZ sex determination systems, the two most common sex determination systems that exist in fish. When mating, Oreochromis mossambica (black tilapia) and red hybrid tilapia produced F1 progeny with a brown colour, the intermediate colour between the two parental body colours. When F1 hybrids were interbred, the three phenotypes got separated in the F2 generation with a 1 black/2 brown/1 red phenotypic ratio as expected of a single autosomal gene with incomplete dominant gene action. The importance of monosex male red tilapia farming and body colour inheritance is also discussed.
      PubDate: 2017-04-07
      DOI: 10.1007/s10499-017-0116-3
       
 
 
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