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  Subjects -> BIOLOGY (Total: 2982 journals)
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BIOLOGY (1420 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 18)
Achievements in the Life Sciences     Open Access   (Followers: 4)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 20)
Acta Biologica Colombiana     Open Access   (Followers: 6)
Acta Biologica Hungarica     Full-text available via subscription   (Followers: 4)
Acta Biologica Sibirica     Open Access  
Acta Biomaterialia     Hybrid Journal   (Followers: 25)
Acta Biotheoretica     Hybrid Journal   (Followers: 5)
Acta Chiropterologica     Full-text available via subscription   (Followers: 6)
acta ethologica     Hybrid Journal   (Followers: 4)
Acta Limnologica Brasiliensia     Open Access   (Followers: 3)
Acta Médica Costarricense     Open Access   (Followers: 2)
Acta Musei Silesiae, Scientiae Naturales : The Journal of Silesian Museum in Opava     Open Access  
Acta Parasitologica     Hybrid Journal   (Followers: 9)
Acta Scientiarum. Biological Sciences     Open Access   (Followers: 2)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Actualidades Biológicas     Open Access   (Followers: 1)
Advanced Health Care Technologies     Open Access   (Followers: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Bioinformatics     Open Access   (Followers: 18)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4)
Advances in Biology     Open Access   (Followers: 8)
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 6)
Advances in Cell Biology     Open Access   (Followers: 23)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Ecological Research     Full-text available via subscription   (Followers: 39)
Advances in Ecology     Open Access   (Followers: 13)
Advances in Environmental Sciences - International Journal of the Bioflux Society     Open Access   (Followers: 20)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Genome Biology     Full-text available via subscription   (Followers: 12)
Advances in High Energy Physics     Open Access   (Followers: 20)
Advances in Human Biology     Open Access  
Advances in Life Science and Technology     Open Access   (Followers: 14)
Advances in Life Sciences     Open Access   (Followers: 4)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 21)
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3)
Advances in Regenerative Biology     Open Access   (Followers: 1)
Advances in Structural Biology     Full-text available via subscription   (Followers: 7)
Advances in Virus Research     Full-text available via subscription   (Followers: 5)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 6)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 1)
Ageing Research Reviews     Hybrid Journal   (Followers: 7)
Aging Cell     Open Access   (Followers: 9)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
AJP Cell Physiology     Full-text available via subscription   (Followers: 13)
AJP Endocrinology and Metabolism     Full-text available via subscription   (Followers: 22)
AJP Lung Cellular and Molecular Physiology     Full-text available via subscription   (Followers: 3)
Al-Kauniyah : Jurnal Biologi     Open Access  
Alasbimn Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Biology Teacher     Full-text available via subscription   (Followers: 12)
American Fern Journal     Full-text available via subscription   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 10)
American Journal of Bioethics     Hybrid Journal   (Followers: 10)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Human Biology     Hybrid Journal   (Followers: 12)
American Journal of Medical and Biological Research     Open Access   (Followers: 5)
American Journal of Plant Sciences     Open Access   (Followers: 20)
American Journal of Primatology     Hybrid Journal   (Followers: 14)
American Malacological Bulletin     Full-text available via subscription   (Followers: 3)
American Naturalist     Full-text available via subscription   (Followers: 63)
Amphibia-Reptilia     Hybrid Journal   (Followers: 6)
Anaerobe     Hybrid Journal   (Followers: 4)
Analytical Methods     Full-text available via subscription   (Followers: 7)
Anatomical Science International     Hybrid Journal   (Followers: 2)
Animal Cells and Systems     Hybrid Journal   (Followers: 4)
Annales de Limnologie - International Journal of Limnology     Hybrid Journal   (Followers: 1)
Annales françaises d'Oto-rhino-laryngologie et de Pathologie Cervico-faciale     Full-text available via subscription   (Followers: 3)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Biologia     Open Access   (Followers: 1)
Annals of Applied Biology     Hybrid Journal   (Followers: 8)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18)
Annals of Human Biology     Hybrid Journal   (Followers: 4)
Annual Review of Biomedical Engineering     Full-text available via subscription   (Followers: 17)
Annual Review of Biophysics     Full-text available via subscription   (Followers: 25)
Annual Review of Cell and Developmental Biology     Full-text available via subscription   (Followers: 37)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
Annual Review of Genomics and Human Genetics     Full-text available via subscription   (Followers: 18)
Annual Review of Phytopathology     Full-text available via subscription   (Followers: 10)
Anthropological Review     Open Access   (Followers: 23)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antibiotics     Open Access   (Followers: 8)
Antioxidants     Open Access   (Followers: 4)
Antioxidants & Redox Signaling     Hybrid Journal   (Followers: 8)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apidologie     Hybrid Journal   (Followers: 4)
Apmis     Hybrid Journal   (Followers: 1)
APOPTOSIS     Hybrid Journal   (Followers: 8)
Applied Bionics and Biomechanics     Open Access   (Followers: 8)
Applied Vegetation Science     Full-text available via subscription   (Followers: 9)
Aquaculture Environment Interactions     Open Access   (Followers: 2)
Aquaculture International     Hybrid Journal   (Followers: 22)
Aquaculture Reports     Open Access   (Followers: 3)
Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society     Open Access   (Followers: 6)
Aquatic Biology     Open Access   (Followers: 4)
Aquatic Ecology     Hybrid Journal   (Followers: 30)
Aquatic Ecosystem Health & Management     Hybrid Journal   (Followers: 13)
Aquatic Science and Technology     Open Access   (Followers: 3)
Aquatic Toxicology     Hybrid Journal   (Followers: 19)
Archaea     Open Access   (Followers: 3)
Archiv für Molluskenkunde: International Journal of Malacology     Full-text available via subscription   (Followers: 3)
Archives of Biomedical Sciences     Open Access   (Followers: 7)
Archives of Microbiology     Hybrid Journal   (Followers: 8)
Archives of Natural History     Hybrid Journal   (Followers: 7)
Archives of Oral Biology     Hybrid Journal   (Followers: 2)
Archives of Virology     Hybrid Journal   (Followers: 5)
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arquivos do Museu Dinâmico Interdisciplinar     Open Access  
Arthropod Structure & Development     Hybrid Journal   (Followers: 2)
Arthropods     Open Access   (Followers: 1)
Artificial DNA: PNA & XNA     Hybrid Journal   (Followers: 2)
Artificial Photosynthesis     Open Access   (Followers: 1)
Asian Bioethics Review     Full-text available via subscription   (Followers: 1)
Asian Journal of Biodiversity     Open Access   (Followers: 5)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Cell Biology     Open Access   (Followers: 5)
Asian Journal of Developmental Biology     Open Access   (Followers: 2)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 2)
Asian Journal of Nematology     Open Access   (Followers: 3)
Asian Journal of Poultry Science     Open Access   (Followers: 4)
Australian Life Scientist     Full-text available via subscription   (Followers: 2)
Australian Mammalogy     Hybrid Journal   (Followers: 5)
Autophagy     Hybrid Journal   (Followers: 2)
Avian Biology Research     Full-text available via subscription   (Followers: 3)
Avian Conservation and Ecology     Open Access   (Followers: 7)
Bacteriology Journal     Open Access   (Followers: 2)
Bacteriophage     Full-text available via subscription   (Followers: 3)
Bangladesh Journal of Bioethics     Open Access  
Bangladesh Journal of Plant Taxonomy     Open Access  
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Berita Biologi     Open Access   (Followers: 1)
Between the Species     Open Access   (Followers: 1)
Bio Tribune Magazine     Hybrid Journal  
BIO Web of Conferences     Open Access  
BIO-Complexity     Open Access  
Bio-Grafía. Escritos sobre la Biología y su enseñanza     Open Access  
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
Biochemistry and Cell Biology     Full-text available via subscription   (Followers: 14)
Biochimie     Hybrid Journal   (Followers: 7)
BioControl     Hybrid Journal   (Followers: 5)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 5)
Biodemography and Social Biology     Hybrid Journal   (Followers: 1)
Biodiversidad Colombia     Open Access  
Biodiversity : Research and Conservation     Open Access   (Followers: 26)
Biodiversity and Natural History     Open Access   (Followers: 5)
Biodiversity Data Journal     Open Access   (Followers: 3)
Biodiversity Informatics     Open Access  
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 2)
Bioelectromagnetics     Hybrid Journal   (Followers: 1)
Bioenergy Research     Hybrid Journal   (Followers: 2)
Bioengineering and Bioscience     Open Access   (Followers: 1)
BioEssays     Hybrid Journal   (Followers: 10)
Bioethics     Hybrid Journal   (Followers: 14)
BioéthiqueOnline     Open Access  
Biofabrication     Hybrid Journal   (Followers: 3)
Biogeosciences (BG)     Open Access   (Followers: 9)
Biogeosciences Discussions (BGD)     Open Access   (Followers: 1)
Bioinformatics     Hybrid Journal   (Followers: 233)
Bioinformatics and Biology Insights     Open Access   (Followers: 14)
Bioinspiration & Biomimetics     Hybrid Journal   (Followers: 6)
Biointerphases     Open Access   (Followers: 1)
Biojournal of Science and Technology     Open Access  
Biologia     Hybrid Journal  
Biologia on-line : Revista de divulgació de la Facultat de Biologia     Open Access  
Biological Bulletin     Partially Free   (Followers: 4)
Biological Control     Hybrid Journal   (Followers: 5)
Biological Invasions     Hybrid Journal   (Followers: 16)
Biological Journal of the Linnean Society     Hybrid Journal   (Followers: 14)
Biological Letters     Open Access   (Followers: 4)
Biological Procedures Online     Open Access  
Biological Psychiatry     Hybrid Journal   (Followers: 41)
Biological Psychology     Hybrid Journal   (Followers: 6)
Biological Research     Open Access  
Biological Rhythm Research     Hybrid Journal   (Followers: 2)
Biological Theory     Hybrid Journal   (Followers: 1)
Biological Trace Element Research     Hybrid Journal  
Biologicals     Full-text available via subscription   (Followers: 9)
Biologics: Targets & Therapy     Open Access   (Followers: 1)
Biologie Aujourd'hui     Full-text available via subscription  
Biologie in Unserer Zeit (Biuz)     Hybrid Journal   (Followers: 44)
Biologija     Open Access  
Biology     Open Access   (Followers: 5)
Biology and Philosophy     Hybrid Journal   (Followers: 16)
Biology Bulletin     Hybrid Journal   (Followers: 1)
Biology Bulletin Reviews     Hybrid Journal  
Biology Direct     Open Access   (Followers: 7)
Biology Letters     Full-text available via subscription   (Followers: 35)
Biology Methods and Protocols     Hybrid Journal  

        1 2 3 4 5 6 7 8 | Last

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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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