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Showing 1 - 200 of 2353 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: 20, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, 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: 11, 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: 4)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, 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: 19, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, 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: 5, 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)
Activitas Nervosa Superior     Hybrid Journal  
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: 15, 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: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 54, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 9, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 22, 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: 41, 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: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 15, 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: 3, 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: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 13, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 23, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 6, 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: 12, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, 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: 3, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
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: 16, 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: 11, 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: 9)
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: 14, 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: 10, 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 Ophthalmology     Hybrid Journal   (Followers: 10)
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: 13, 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 Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, 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: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, 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: 62, 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: 8, 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: 17, 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: 4, 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: 53, 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 and Museum Informatics     Hybrid Journal   (Followers: 122)
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: 17, 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: 17, 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: 14, 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: 12, 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  

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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  [2353 journals]
  • Seaweed aquaculture in Norway: recent industrial developments and future
    • Authors: Pierrick Stévant; Céline Rebours; Annelise Chapman
      Pages: 1373 - 1390
      Abstract: Abstract The use of cultivated seaweeds as a feedstock for multiple industrial applications has gained increasing interest in the Western World over the past decades. Norway has an extensive coastline and a well-established aquaculture sector offering suitable preconditions for developing large-scale cultivation of seaweed biomass both in monoculture and in Integrated Multi-Trophic Aquaculture (IMTA) systems. Recent efforts from research, industry and public authorities have been committed to develop a Norwegian bio-economy based on cultivated seaweed, focusing on cultivation and processing of the biomass. This review reports on the status of seaweed aquaculture in Norway, supported by production data collected since the delivery of the first commercial cultivation permits at sea in 2014. Although novel product developments are currently limited, future industrial perspectives based on cultivated biomass are being discussed. Upscaling from experimental cultivation schemes to commercial production requires a thorough assessment of the risks and benefits associated with seaweed aquaculture, as well as the development of a regulative framework adapted to this industry. Issues associated with upscaling the macroalgal production that needs to be addressed includes (i) genetic interactions between cultivated and wild crops, (ii) impacts of seaweed cultivation on surrounding ecosystems, (iii) epiphytes and diseases, (iv) area utilization and (v) threats from climate change. Addressing these issues and adapting production practices will ensure the environmental and economic sustainability of an emerging industry based on cultivated seaweed biomass in Norway.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0120-7
      Issue No: Vol. 25, No. 4 (2017)
  • Effect of molasses addition at C:N ratio of 20:1 on the water quality and
           growth performance of giant freshwater prawn ( Macrobrachium rosenbergii )
    • Authors: Shuyan Miao; Longsheng Sun; Hongyi Bu; Jinyu Zhu; Guohong Chen
      Pages: 1409 - 1425
      Abstract: Abstract A 90-day experiment consisting of two groups, a biofloc treatment and a control treatment, was performed in six indoor cement ponds to investigate the effectiveness of biofloc technology (BFT) for maintaining water quality and growth performance of Macrobrachium rosenbergii in a zero-exchange water system. Molasses was added to the biofloc ponds with the C/N ratio of 20:1 based on the amount of daily feed. The floc volume in the biofloc group increased gradually (28.72 mL L−1) along with molasses addition, but the value in the relative control group remained at low levels (0.40–4.97 mL L−1) (P < 0.05). A total of 4.97% Bacillus, 4.20% Lactococcus, and 9.65% Nitrospira were determined in the biofloc water, and these values were significantly higher than that in the control water (P < 0.05). Ammonia-N, nitrite-N, nitrate-N, and total nitrogen concentrations in the biofloc water were significantly lower than that in the relative control group (P < 0.05). Potassium orthophosphate (PO4 −-P) and total phosphorous (TP) concentrations increased consistently in both groups. The same-day value of PO4 −-P concentration in the control group (6.37–12.96 mg L−1) was 1.5 higher than that of the biofloc group (4.66–7.99 mg L−1) from day 60 to day 90 (P < 0.05). Significant differences in TP concentration (P < 0.05) were noted between the control and biofloc groups from the 15th day to the 30th day and from the 60th day to the 90th day. The biofloc treatment resulted in a 10.62% higher survival rate, a 27.55% higher weight gain rate, and a 7.13% higher specific growth rate (P < 0.05). The findings of the present study demonstrated that BFT effectively promoted water quality, as well as growth and survival of M. rosenbergii, by regulating the inorganic nitrogen and phosphorus dynamics.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0124-3
      Issue No: Vol. 25, No. 4 (2017)
  • Can bacterial biofiltration be replaced by autotrophic organisms in
           recirculating fresh water aquaculture'
    • Authors: Suvi Ojanen; Esa Tyystjärvi; Henrik Holmberg; Mikko Kouhia; Pekka Ahtila
      Pages: 1427 - 1440
      Abstract: Abstract In recirculating aquaculture, a bacterial biofilter is applied to convert ammonium, excreted by the fish, to the non-toxic nitrate. Unfortunately, nitrifying bacteria produce off-flavor compounds that lower fish quality. We investigated, by calculations and estimations, possibilities to replace the biofilter by autotrophic organisms that incorporate ammonium in biomass, consume other mineral nutrients and produce marketable biomass and oxygen. The capacity of microalgae, macroalgae, duckweed, strawberry, and tomato to assimilate ammonium was calculated, using data from an existing Finnish fresh water fish farm. Microalgae were found to be the most effective for ammonium removal, and they would be able to consume the ammonium produced by a fish farm if the algae were grown in a facility with approximately twice the area of the fish farm itself. Macroalgae and duckweed appeared to be the second best option for ammonium removal, and strawberry and tomato were predicted to have a somewhat smaller capacity for ammonium removal. Due to low ammonium content, microalgae cannot be cultivated in the recirculating water, but rather the nutrients should be allowed to diffuse through a semipermeable membrane to microalgae.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0126-1
      Issue No: Vol. 25, No. 4 (2017)
  • Effect of dietary supplementation of Agrimos® on growth performance, feed
           utilization and immunological parameters of Macrobrachium rosenbergii
    • Authors: Khaled Mohamed; Mohamed E. Megahed; Mervat A.M. Ali
      Pages: 1441 - 1452
      Abstract: Abstract The present study was conducted to investigate the impact of adding commercial feed additives Agrimos® (combined yeast, Saccharomyces cerevisiae mannan oligosaccharides, and β-glucan) in the diet of Macrobrachium rosenbergii during the juvenile stage on growth performance, feed utilization, and immunological parameters. Four hundred and fifty juveniles of average weight 2.2 ± 0.02 g were divided into five experimental groups with three replicates each. The experiment was conducted for 56 days. Five isocaloric and isonitrogenous diets were formulated to be contain 350 g kg−1 crude protein and 19.4 MJ GE; four diets contain different levels of Agrimos® (1.5, 2, 2.5, and 3 g kg−1) in addition to control diet without Agrimos®. Final body weight, weight gain, and specific growth rate of Agrimos® fed groups were significantly higher (p < 0.05) than the control group. Survival rate of the Agrimos® fed groups and control was not significantly different (p > 0.05). In addition, the feed conversion ratio and protein efficiency ratio in treatments supplemented by Agrimos® were significantly better (p < 0.05) than those fed the control diet. Concerning the influence of the Agrimos® on proximate composition of carcass, no significant differences (p > 0.05) were observed among different treatments. Increased immune response was observed in experimental groups with the 2.5 g kg−1 Agrimos® concentration yielding the significantly higher (p < 0.05) total hemocyte count and phenoloxidase. In conclusion, the additions of Agrimos® in the diet 3 at a concentration of 2.5 g kg−1 improved and enhanced the growth performance and feed utilization of M. rosenbergii juveniles.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0123-4
      Issue No: Vol. 25, No. 4 (2017)
  • Feminization strategies in crustacean aquaculture
    • Authors: Muzaffer Mustafa Harlıoğlu; Ardavan Farhadi
      Pages: 1453 - 1468
      Abstract: Abstract Crustacean aquaculture production has developed rapidly in recent years because there has been an increase in crustacean market demands in different regions of the world. The growth rate of the most cultured crustacean species depends on genders. Therefore, monosex crustacean aquaculture, all male or all female, is more suitable for achieving higher yields, with the ecological benefits of reducing the risk of cannibalism. In addition, feminization is also appropriate for increasing individual number in populations because males are able to copulate with more females. For this reason, sexual manipulations are important in crustacean reproduction units. This review focuses on the sex differentiation mechanism and the use of different strategies for feminization of economically important crustaceans. In this review, feminization strategies are divided into two main methods: direct feminization and indirect feminization (masculinization). Direct feminization includes (1) ablation of androgenic gland (AG), (2) silencing and suppression AG and androgenic gland hormones (AGHs), (3) hormone therapy (i.e., 17β-estradiol), and (4) polyploidy induction. This review also emphasizes how feminization is carried out for crustaceans belonging to the different sex determination systems (ZW or XY) by using indirect method. The intension of controlling sexual differentiation for crustaceans will continue to increase in the next a few years, either for basic research or for its utilization to crustacean aquaculture; hence, this review will be profitable for crustacean farmers and researches.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0128-z
      Issue No: Vol. 25, No. 4 (2017)
  • Effect of temperature and nitrogen concentration on the growth and lipid
           content of Spirulina platensis and biodiesel production
    • Authors: Safak Seyhaneyildiz Can; Edis Koru; Semra Cirik
      Pages: 1485 - 1493
      Abstract: Abstract In this study, Spirulina platensis (Cyanophyceae) was cultured at five mediums with different amounts of sodium nitrate and three different temperatures. The study was conducted at 1600 lx light intensity and a pH value of 9. The influences of nitrate amounts and temperature on biomass growth and lipid amount were studied during 20 days. The best biomass growth (1.039 ± 0.668 g L−1 dry weight and 0.780 ± 0.501 optical density) for S. platensis was obtained from the group with the temperature value of 35 °C and 2.5 g L−1 of sodium nitrate. The highest lipid production (4.70 ± 0.067% dry weight) was in the nitrate-free medium at 15 °C. The best results for biomass growth and lipid production were obtained from the group at 35 °C and 1.25 g L−1 of sodium nitrate (P < 0.05). At the end of the study, it was determined that algal biomass increased with increasing the nitrate amount but the produced lipid by the algae decreased. Intensive production was performed in accordance with the culture conditions of the most productive groups and biodiesel was obtained from the algae. The density, viscosity, and flash point of the biodiesel were calculated as 0.78, 4.67, and 107 °C, respectively.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0121-6
      Issue No: Vol. 25, No. 4 (2017)
  • Replacement of fish meal with corn gluten meal in feeds for Asian seabass
           ( Lates calcarifer )
    • Authors: Sambasivam Nandakumar; Kondusamy Ambasankar; Sajjad Syed Raffic Ali; Jagabatula Syamadayal; Kumaraguru Vasagam
      Pages: 1495 - 1505
      Abstract: Abstract A 45-day feeding trial was conducted to study the effect of replacing dietary fish meal (FM) with corn gluten meal (CGM) on diet digestibility and growth and proximate body composition of Asian seabass (Lates calcarifer) fingerlings (21.1 ± 0.95 g). Five isonitrogenous and isocaloric diets, formulated to contain 40% protein and 10% lipid, were prepared with fish meal replacement at 0 (control), 5, 10, 15, and 20% (w/w basis) using CGM. The trial was carried out in 1000-L fiber-reinforced polymer (FRP) tanks with three replicates (each containing 20 fish) for each treatment, and fish were hand fed in excess twice daily at 10.00 and 16.00 h. There was no significant difference in final body weight, average daily gain, and survival for fish fed the CGM0, CGM5, and CGM10 diets, with fish in these treatments performing better than the others. Feed conversion ratios for fish fed CGM0 (1.73 ± 0.05 g feed /g gain), CGM5 (1.65 ± 0.06 g feed g−1 gain), and CGM10 (1.84 ± 0.07 g feed g−1 gain) were better than for the other treatments. Protein retention (28.85 ± 0.65%) and energy retention (20.60 ± 0.39%) were better in the group fed with CGM5 than the other treatments. Apparent digestibility coefficients of dry matter (65.1 ± 0.3, 64.7 ± 0.2%), protein (91.6 ± 0.5, 91.7 ± 0.3%), and energy (79.0 ± 0.27, 8.4 ± 0.1%) were highest for the CGM5 and CGM10 diets. Highest crude lipid (7.29 ± 0.09%) and gross energy (7.19 ± 0.05 kJ g−1) were observed in fish fed the CGM 20 diet. The results indicate that CGM is a potential feed ingredient for seabass and can be included at 10% of the diet without compromising digestibility and growth.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0133-2
      Issue No: Vol. 25, No. 4 (2017)
  • Research on China’s mariculture efficiency evaluation and influencing
           factors with undesirable outputs—an empirical analysis of China’s ten
           coastal regions
    • Authors: Pingping Wang; Jianyue Ji
      Pages: 1521 - 1530
      Abstract: Abstract Based on the data of China’s ten coastal regions from 2003 to 2012, this paper conducts a data envelopment analysis (DEA) model to evaluate China’s mariculture efficiency with undesirable outputs using Seiford’s linear converting method. The result shows the average efficiency is about 0.714, relatively low and without ascending over time. The efficiency of different provinces differing obviously, ones of Tianjin and Guangxi are high while Hebei and Jiangsu’s are low. Efficiency-influencing factors are analyzed with the Tobit model, revealing that technology extension convenience and technology level have positive influence, while training intensity factor has negative one. The species structure factor and regional factor have also been found to have significant impact on the efficiency.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0131-4
      Issue No: Vol. 25, No. 4 (2017)
  • A comparison of the fatty acid profiles of newly hatched, fed, and starved
           juveniles of Amphioctopus fangsiao (d’Orbigny 1839)
    • Authors: Vasiliki Tziouveli; Saichiro Yokoyama
      Pages: 1531 - 1542
      Abstract: Abstract The paper provides a first look into the fatty acids (FA) of young Amphioctopus fangsiao. Laboratory-hatched, 1-day-old juveniles (NH) were analyzed to identify the basal FA profile. To determine dietary effects on FA, individually kept juveniles (FD) were fed mysids once daily. Others were subjected to starvation (ST) to examine which FA may be used and which would be conserved. Treatments run for 25 days post-hatch, at which time ST and FD were analyzed to record FA changes. The dominant FA were 16:0, eicosapentaenoic (EPA), and docosahexaenoic (DHA), overall accounting for 40–60%. Monounsaturated FA (MUFA) were the highest in FD at 24.2% whereas highly unsaturated FA (HUFA) were most prominent in ST at 45.5%, followed by NH at 40.2%. Among n-3 HUFA, DHA was dominant in ST at 22.9 mg g−1 dry weight (DW), the role assumed by EPA in FD at 11.5 mg g−1 DW. Consequently, the DHA/EPA ratio was the lowest in FD. Arachidonic was the most abundant n-6 HUFA, representing >5% in total FA. However, n-6 FA were not prevalent, resulting in high n-3/n-6 in all juveniles. It could be argued that young A. fangsiao require n-3 HUFA, particularly DHA and EPA at a ratio of ideally >1.5 and to a lesser extent n-6 HUFA. Juveniles fed on a low lipid, high n-3 diet increased their MUFA content while maintaining high HUFA. Despite changes in the FA of ST individuals, it appears food-deprived A. fangsiao do not depend on FA mobilization for energy production.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0130-5
      Issue No: Vol. 25, No. 4 (2017)
  • Betanodavirus infection in reared marine fishes along the Arabian Gulf
    • Authors: Singaiah NaveenKumar; Mohamed A Hassan; Mahmoud A. Mahmoud; Adly Al-Ansari; Waleed K Al-Shwared
      Pages: 1543 - 1554
      Abstract: Abstract Betanodavirus or nervous necrosis virus (NNV) is responsible for viral nervous necrosis (VNN) of fishes and is associated with mass mortalities of various fish species throughout the world. Here, we report for the first time Betanodavirus infection in Arabian Gulf region of the Kingdom of Bahrain. The present study is also the first report of mortality due to NNV infection in sobaity seabream Sparidentex hasta. NNV was detected in reared fry of gilthead seabream Sparus aurata and adults of sobaity seabream and brown-spotted grouper Epinephelus chlorostigma using nested PCR. In the present study, the rearing unit recorded 100% mortality in fry of gilthead seabream and 24 and 63% mortalities were recorded in different age groups of adult sobaity seabream due to VNN. Classical clinical signs of VNN such as body discoloration, loss of appetite and abnormal swimming behaviour were observed in fry of gilthead seabream. Histopathological studies revealed characteristic vacuolation and degeneration of brain and ocular tissues of sobaity seabream. However, brown-spotted grouper carried subclinical NNV infection, and there was no mortality in the group. Sequencing of nested PCR products and real-time PCR further confirmed the presence of the virus.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0134-1
      Issue No: Vol. 25, No. 4 (2017)
  • Multiplex PCR assay for the simultaneous detection of bacterial pathogens
           in rainbow trout
    • Authors: Nadia Rajabzadeh; Mohsen Naeemipour; Mohsen Seyedabadi
      Pages: 1569 - 1575
      Abstract: Abstract Accurate, rapid, and specific methods are required to identify pathogens for controlling bacterial diseases in fish. Various microbiological and biochemical methods are used to isolate and identify pathogens, but they are not adequately efficient and/or accurate. For example, distinguishing between Streptococcus iniae and Lactococcus garvieae is difficult via microbiological tests. Moreover, these bacteria often cause concurrent infections. Therefore, early and accurate identification of bacterial pathogens in trout is of utmost importance to prevent possible damage. Because of this, the multiplex polymerase chain reaction (multiplex PCR) method was optimized for simultaneous identification of bacterial infections caused by Yersinia ruckeri, S. iniae, and L. garvieae, three harmful bacteria of great importance in aquaculture. Multiplex PCR reaction was optimized on control samples, and the sensitivity and specificity of the test were evaluated. Multiplex PCR reaction was then performed on DNA isolated from samples collected from fish-breeding farms and transported to the laboratory. Multiplex PCR was found to be an accurate and sensitive method to identify simultaneously different species of bacteria.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0135-0
      Issue No: Vol. 25, No. 4 (2017)
  • Effects of temperature, salinity, diet and stocking density on development
           of the veined Rapa whelk, Rapana venosa (Valenciennes, 1846) larvae
    • Authors: Tao Zhang; Hao Song; Yu-Cen Bai; Jing-Chun Sun; Xiao-Fang Zhang; Shao-Jun Ban; Zheng-Lin Yu; Mei-Jie Yang; Hai-Yan Wang
      Pages: 1577 - 1590
      Abstract: Abstract The veined rapa whelk Rapana venosa (Valenciennes, 1846) is an important and valuable fishery resource but has not been cultured on a large scale. We studied the effects of environmental factors, temperature, salinity, diet, and stocking density, on growth and survival of larvae to determine optimal artificial culture conditions. The optimal temperature was 25–31 °C at 30 ppt at densities of about 200 veligers per liter, under which the mean shell length (737–1006 μm) and survival rate (36–45%) were higher than those held at other temperatures. When cultured under a salinity of 25 ppt at 25 °C with densities of about 200 veligers per liter, larvae had the highest mean shell length (878.45–917.88 μm) and survival rate (29.75%). Larvae were fed a mixed diet, Pseudoisochrysis paradoxa + Tetraselmis chui + Chlorella vulgaris. Optimal stocking density was 300 veligers per liter for the first 5 days and was 100 veligers per liter afterward at 25 °C and 30 ppt.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0140-3
      Issue No: Vol. 25, No. 4 (2017)
  • Interaction effects of dietary lipid and lysine on growth feed utilization
           and body composition of juvenile grass carp ( Ctenopharyngodon idella )
    • Authors: Xiaoxia Li; Liliu Zhou; Huangyan Mo; Qing Pan; Lian Gan
      Pages: 1591 - 1606
      Abstract: Abstract An 8-week feeding trial was designed to investigate the effects of varying dietary lipid and lysine levels on the growth, feed utilization, and blood characteristics of juvenile grass carp (Ctenopharyngodon idella). Six diets were formulated to contain one of three lysine levels (1.5, 1.7, and 2.0%) and one of two lipid levels (2.4 and 5.4%). Each diet was randomly assigned to triplicate tanks of 30 juvenile fish (initial body weight, 3.00 ± 0.02 g). The results showed that the weight gain, specific growth rate, feed efficiency, protein efficiency ratio, nitrogen retention, and lipid retention were significantly affected by dietary lipid and lysine levels (P < 0.05). However, no significant difference was observed in survival among the treatments (P > 0.05). All growth and feed efficiency indices decreased with an increasing dietary lipid level and significantly improved with lysine supplementation (P < 0.05). The dietary lipid levels significantly influenced the moisture and lipid contents of the whole body and muscle: the lipid content of tissue significantly increased with increasing dietary lipid and was inversely correlated with tissue moisture content (P < 0.05). The hepatosomatic index, intraperitoneal fat index (IPF), and serum cholesterol and triacylglycerol contents were significantly higher in fish that were fed the high-lipid diet (P < 0.05). Fish fed the low-lipid diet showed significantly higher amino acid concentrations compared to those fed the high-lipid diet, and the amino acid content improved with lysine supplementation (P < 0.05). Furthermore, dietary lipid, lysine, and their interaction had significant effects on growth performance, IPF, and tissue lipid content (P < 0.05). The results of the present study suggest a positive effect of dietary lysine supplementation on the growth and feed efficiency, serum lipid metabolism improvement, and reduction of IPF in juvenile grass carp.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0132-3
      Issue No: Vol. 25, No. 4 (2017)
  • Modern greenhouse culture of juvenile soft-shelled turtle, Pelodiscus
    • Authors: Jing Zhang; Fen Wang; Ye-Lin Jiang; Guan-Jun Hou; Yun-Sheng Cheng; Hong-Lian Chen; Xiang Li
      Pages: 1607 - 1624
      Abstract: Abstract Chinese soft-shelled turtle (Pelodiscus sinensis) is a favorite food for the Asian because of its high nutritional and medicinal value. Based on an estimate production of 350,000 MT in 2015, soft-shelled turtle culture industry in China values US$5.22 billion. In central China, overwinter in greenhouse is necessary for the juvenile turtle. The use of coal boiler to heat up the water to 30 °C is a common practice, however, brings in air pollution and CO2 emission too. A modern greenhouse equipped with ground source heat pump was built in 2010 and operated during 2014–2015 for 10 months to culture juvenile turtle. Besides heating system, the other innovative features such as skirt-shaped 3-D shelter, underwater feeding platform wok-shaped tank bottom with central drainage, and semi-homemade soft shell-shaped pellet together achieved excellent rearing performance, such as high turtle productivity of 23.7 kg m−2, high survival 86%, low feed efficiency-feed conversion rate 1.26 and good water quality-dissolved oxygen >5 mg L−1, and nitrite and ammonia concentration all time within safe range. Moreover, it is a lucrative business which brought in an estimated net profit of 76%.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0137-y
      Issue No: Vol. 25, No. 4 (2017)
  • Bdellovibrio and like organisms promoted growth and survival of juvenile
           abalone Haliotis discus hannai Ino and modulated bacterial community
           structures in its gut
    • Authors: Yanbiao Guo; Qi Pan; Shiqi Yan; Yuhong Chen; MingJia Li; Dan Chen; Hongcao Han; Bing Wu; Junpeng Cai
      Pages: 1625 - 1643
      Abstract: Abstract In this study, Bdellovibrio and like organisms (BALOs) strain BDH12 that possessed a wide lysis spectrum was tested in coldwater abalone (Haliotis discus hannai Ino) juvenile rearing, and its effect on survival and growth and on gut bacterial communities was investigated. A 90-day rearing experiment at the production level was performed. At the end, juvenile abalone grew from the initial shell length of 4.0 ± 1.0 to 12.63 ± 2.12 mm in control and 14.89 ± 1.27 mm in test (p < 0.05). With the addition of BDH12, abalone survival rate, percentage weight gain, shell length gain, and average daily growth in test reached 63.3 ± 1.87%, 6834 ± 39%, 272 ± 15%, and 4.56 ± 1.18 mg day−1, respectively, significantly (p < 0.05) higher than those in control, viz., 41.8 ± 3.36%, 4168 ± 47%, 216 ± 17%, and 2.78 ± 1.37 mg day−1, respectively. Total cultivable Vibrio counts (TCVC) and bacterial counts (TCBC) were enumerated by conventional culturing. Compared to control, TCVC and TCBC in test were reduced by 2.39 and 4.07 log colony forming units·mL−1, respectively, in rearing water (p < 0.05), and by 3.54 and 4.11 log CFU·g−1, respectively, in abalone guts (p < 0.05). Strong negative correlations were found between abalone shell length/weight with TCBC/TCVC in rearing water/guts (p < 0.01). Additionally, 16S rDNA-PCR and denaturing gradient gel electrophoresis profiles revealed that of the 27 species/strains sequenced, 51.85% (14) were shared by both control and test and 22.22% (6) reduced, of which 33.33% (2) were Vibrio. The results of this study demonstrated that BDH12 can be beneficially applied in coldwater abalone rearing.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0138-x
      Issue No: Vol. 25, No. 4 (2017)
  • Effects of strain and body weight on low-oxygen tolerance of channel
           catfish ( Ictalurus punctatus )
    • Authors: Xiaozhu Wang; Shikai Liu; Rex Dunham; Zhanjiang Liu
      Pages: 1645 - 1652
      Abstract: Abstract Low-oxygen tolerance is important for aquaculture species, because exposure to hypoxia can result in heavy mortalities. This study evaluated the effects of strain, body weight, and gender on low-oxygen tolerance in channel catfish (Ictalurus punctatus) exposed to a lethal concentration of dissolved oxygen (0.1 mg/L). The variation in low-oxygen tolerance, assessed as the time to loss of equilibrium, of channel catfish from six strains (103KS, Kansas, KMix, Marion, Marion S, and Thompson) was examined. Catfish (15–179 g) showed a large variation in resistant time to hypoxia, ranging from 8 to 104 min, and both strain and body weight contributed significantly to this variation (P < 0.05). 103KS and Marion S strains had higher low-oxygen tolerance than the other strains, while the Marion strain had the poorest low-oxygen tolerance (P < 0.05). In addition to genetic background, body weight positively correlated with low-oxygen tolerance, but there were no significant differences between female and male catfish in low-oxygen tolerance. The results indicate that genetic background and body weight are important factors that contribute variations in low-oxygen tolerance.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0125-2
      Issue No: Vol. 25, No. 4 (2017)
  • The immunostimulatory effect of saponin immersion against Vibrio
           alginolyticus in swimming crab Portunus trituberculatus
    • Authors: Jonas Wiza Ng’ambi; Ronghua Li; Changkao Mu; Weiwei Song; Chunlin Wang
      Pages: 1667 - 1678
      Abstract: Abstract Swimming crab Portunus trituberculatus immersed in 1 mg L−1 saponin showed a significant increase in total hemocyte, hyaline, and granular cell counts compared to the control (p < 0.05). Superoxide dismutase, glutathione peroxidase, and phagocytic activities increased significantly compared to the control. Heat shock protein (HSP) 60 and immune gene transcripts (crustin, lectin, prophenoloxidase, and CuZnSOD) increased significantly (p < 0.05) to the highest levels by 48 h of immersion and then declined sharply at 72 h. Although immersion of P. trituberculatus in 1 mg L−1 saponin may enhance its immune response and resistance against Vibrio alginolyticus infection, the results of this study suggest that immunosuppression may take place when the crabs are immersed longer than 48 h.
      PubDate: 2017-08-01
      DOI: 10.1007/s10499-017-0139-9
      Issue No: Vol. 25, No. 4 (2017)
  • Nocardia seriolae infection in cultured jade perch, Scortum barcoo
    • Authors: Fang Wang; Xuguang Wang; Chun Liu; Ouqin Chang; Yongyong Feng; Lang Jiang; Kaibin Li
      Abstract: Abstract Nocardiosis is a chronic infectious disease that afflicts multiple fish species and poses a growing threat to the aquaculture. In this study, Nocardia sp. infection was identified in jade perch, Scortum barcoo, from a pond culture in Guangzhou, China. The infected fish were characterized by dark body color, occasional skin ulcerations, and nodular lesions in the kidney, liver, heart, and other organs with typical granuloma structure under light microscopy. Ziehl–Neelsen staining revealed a large quantity of bacterial aggregates within lesions. Histological examination of the kidney, liver, and spleen demonstrated typical granuloma accompanied by histopathological changes. A bacterial strain with consistent morphology was isolated from multiple tissues. Symptoms of nocardiosis were also observed in healthy fish after artificial infection with the isolated strain. Physiological and biochemical experiments suggested that the isolated strain shared the basic characteristics of Nocardia, and the causative pathogen was subsequently confirmed as Nocardia seriolae by sequencing of 16S ribosomal RNA and the gyrB gene. To our knowledge, this is the first report of nocardiosis in jade perch; it may pose a serious risk to the aquaculture of jade perch due to prolonged incubation prior to symptom emergence and the low efficacy of current treatments in china.
      PubDate: 2017-08-14
      DOI: 10.1007/s10499-017-0184-4
  • Comparison of growth and survival among selected population, inbreeding
           population, and wild population in Fenneropenaeus chinensis
    • Authors: Kun Luo; Jie Kong; Xianhong Meng; Sheng Luan; Baolong Chen; Baoxiang Cao
      Abstract: Abstract In this study, inbreeding population was constructed by full-sib mating of “Huang Hai No. 2” core population in Fenneropenaeus chinensis. Growth and survival of three different stages were studied in three populations, including selected population, inbreeding population, and wild population. The growth experimental results show that body weight of selected population in all the three growth stages was significantly higher than those of inbreeding population and wild population (P < 0.05). At day 90, body weight of the selected population increased by 13.1 and 19.4%, compared with those of inbreeding population and wild population and the specific growth rate (SGR) for body weight of three populations were 2.24, 2.16, and 2.11. Coefficient of variation of body weight among the three populations were different; the highest was 23.75% in the selected population and the lowest was 16.76% in the wild population, which showed that there is potentiality for further selection. The survival results indicated that the difference of survival of the three populations were significant (P < 0.05), that of the selected population increased by 10.78 and 14.20%, compared with those of inbreeding population and wild population, and the average survival rate of the three populations were 74, 66.8, and 64.8%, respectively. Full-sib matings revealed that the amount of inbreeding depression of body weight varied from −7.68 to −11.53%, and the estimated average inbreeding depression coefficient was −4.61 per 10% increase of inbreeding coefficient of F. For survival trait, the estimated average inbreeding depression coefficient ranged from −2.62–3.81%, and the inbreeding depression was −1.05 per 10% increase of inbreeding coefficient of F, lower than the estimate obtained for growth. These results suggest that selection works well in the breeding program of F. chinensis, and inbreeding especially full-sib matings should be avoided in the following breeding programs.
      PubDate: 2017-08-07
      DOI: 10.1007/s10499-017-0177-3
  • Genetic evaluation of feed efficiency in the breeding population of
           Fenneropenaeus chinensis “Huanghai No. 2” using phenotypic, pedigree
           and genomic information
    • Authors: Ping Dai; Sheng Luan; Xia Lu; Kun Luo; Baoxiang Cao; Xianhong Meng; Jie Kong
      Abstract: Abstract Genetic evaluation of feed efficiency for Fenneropenaeus chinensis was implemented in the breeding population of “Huanghai No. 2” using phenotypic, pedigree and genomic information via a single-step genomic best linear unbiased prediction method (ssGBLUP). Feed efficiency ratio (FER) and average daily gain (ADG) were recorded individually during the grow-out period in 51 full-sib families from the breeding population. High level of inter-individual variation (0.055–0.593) existed in FER. Marginal means of families for FER (0.115–0.388) displayed large inter-family variation. A total of 123 individuals in the pedigree were genotyped with 14,165 single nucleotide polymorphism (SNP) markers, which were used to construct a genomic relationship matrix. Heritability estimate of FER based on pedigree and genomic information reached a moderate level (0.259 ± 0.101), which was not significantly different from that based on only pedigree (P > 0.05). FER exhibited strong and positive genetic and phenotypic correlations (> 0.80) with ADG. ssGBLUP and the pedigree-based method were found to be consistent in predicting breeding values. No clear differences in accuracy were observed between the two methods through cross-validation. Although the heritability estimate of FER highlights the potential to implement breeding programs for feed efficiency in Huanghai No. 2, indirect selection for FER through increased growth may be a better choice considering the difficulty of measuring individual FER in shrimps.
      PubDate: 2017-08-07
      DOI: 10.1007/s10499-017-0182-6
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