Subjects -> BIOLOGY (Total: 3447 journals)
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BIOLOGY (1643 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 30)
Achievements in the Life Sciences     Open Access   (Followers: 8)
ACS Pharmacology & Translational Science     Hybrid Journal   (Followers: 2)
ACS Synthetic Biology     Hybrid Journal   (Followers: 31)
Acta Biologica Colombiana     Open Access   (Followers: 7)
Acta Biologica Hungarica     Full-text available via subscription   (Followers: 5)
Acta Biologica Sibirica     Open Access   (Followers: 2)
Acta Biologica Turcica     Open Access   (Followers: 1)
Acta Biologica Venezuelica     Open Access  
Acta Biomaterialia     Hybrid Journal   (Followers: 30)
Acta Biotheoretica     Hybrid Journal   (Followers: 3)
Acta Chiropterologica     Full-text available via subscription   (Followers: 6)
acta ethologica     Hybrid Journal   (Followers: 4)
Acta Fytotechnica et Zootechnica     Open Access   (Followers: 1)
Acta Limnologica Brasiliensia     Open Access   (Followers: 4)
Acta Médica Costarricense     Open Access   (Followers: 2)
Acta Musei Silesiae, Scientiae Naturales     Open Access   (Followers: 2)
Acta Neurobiologiae Experimentalis     Open Access  
Acta Parasitologica     Hybrid Journal   (Followers: 12)
Acta Scientiae Biological Research     Open Access   (Followers: 1)
Acta Scientiarum. Biological Sciences     Open Access   (Followers: 2)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis     Open Access   (Followers: 1)
Actualidades Biológicas     Open Access   (Followers: 1)
Advanced Biosystems     Hybrid Journal  
Advanced Health Care Technologies     Open Access   (Followers: 10)
Advanced Journal of Graduate Research     Open Access   (Followers: 1)
Advanced Nonlinear Studies     Hybrid Journal  
Advanced Quantum Technologies     Hybrid Journal  
Advanced Studies in Biology     Open Access   (Followers: 1)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Bioinformatics     Open Access   (Followers: 20)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4)
Advances in Biology     Open Access   (Followers: 12)
Advances in Cell Biology/ Medical Journal of Cell Biology     Open Access   (Followers: 30)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 14)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 14)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 7)
Advances in Ecological Research     Full-text available via subscription   (Followers: 44)
Advances in Environmental Sciences - International Journal of the Bioflux Society     Open Access   (Followers: 19)
Advances in Enzyme Research     Open Access   (Followers: 11)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 9)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in High Energy Physics     Open Access   (Followers: 22)
Advances in Human Biology     Open Access   (Followers: 5)
Advances in Life Science and Technology     Open Access   (Followers: 20)
Advances in Life Sciences     Open Access   (Followers: 7)
Advances in Marine Biology     Full-text available via subscription   (Followers: 21)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 26)
Advances in Organ Biology     Full-text available via subscription   (Followers: 2)
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 7)
Advances in Structural Biology     Full-text available via subscription   (Followers: 6)
Advances in Tropical Biodiversity and Environmental Sciences     Open Access   (Followers: 3)
Advances in Virus Research     Full-text available via subscription   (Followers: 6)
Adversity and Resilience Science : Journal of Research and Practice     Hybrid Journal   (Followers: 1)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 12)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Ageing Research Reviews     Hybrid Journal   (Followers: 12)
Aging Cell     Open Access   (Followers: 26)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
AJP Cell Physiology     Hybrid Journal   (Followers: 18)
AJP Endocrinology and Metabolism     Hybrid Journal   (Followers: 25)
AJP Lung Cellular and Molecular Physiology     Hybrid Journal   (Followers: 3)
Al-Kauniyah : Jurnal Biologi     Open Access  
Alasbimn Journal     Open Access   (Followers: 2)
Alces : A Journal Devoted to the Biology and Management of Moose     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Biology Teacher     Full-text available via subscription   (Followers: 14)
American Fern Journal     Full-text available via subscription   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 9)
American Journal of Bioethics     Hybrid Journal   (Followers: 16)
American Journal of Human Biology     Hybrid Journal   (Followers: 18)
American Journal of Medical and Biological Research     Open Access   (Followers: 10)
American Journal of Plant Sciences     Open Access   (Followers: 21)
American Journal of Primatology     Hybrid Journal   (Followers: 16)
American Malacological Bulletin     Full-text available via subscription   (Followers: 3)
American Naturalist     Full-text available via subscription   (Followers: 81)
Amphibia-Reptilia     Hybrid Journal   (Followers: 6)
Anadol University Journal of Science and Technology B : Theoritical Sciences     Open Access  
Anadolu University Journal of Science and Technology : C Life Sciences and Biotechnology     Open Access   (Followers: 2)
Anaerobe     Hybrid Journal   (Followers: 4)
Anales de Biología     Open Access   (Followers: 2)
Analytical Methods     Full-text available via subscription   (Followers: 13)
Anatomical Science International     Hybrid Journal   (Followers: 3)
Animal Cells and Systems     Hybrid Journal   (Followers: 5)
Animal Models and Experimental Medicine     Open Access  
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 Universitatis Mariae Curie-Sklodowska, sectio C – Biologia     Open Access   (Followers: 1)
Annals of Applied Biology     Hybrid Journal   (Followers: 8)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 19)
Annals of Human Biology     Hybrid Journal   (Followers: 6)
Annals of Science and Technology     Open Access  
Annual Research & Review in Biology     Open Access   (Followers: 2)
Annual Review of Biomedical Engineering     Full-text available via subscription   (Followers: 15)
Annual Review of Biophysics     Full-text available via subscription   (Followers: 26)
Annual Review of Cancer Biology     Full-text available via subscription   (Followers: 4)
Annual Review of Cell and Developmental Biology     Full-text available via subscription   (Followers: 42)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Annual Review of Genomics and Human Genetics     Full-text available via subscription   (Followers: 27)
Annual Review of Phytopathology     Full-text available via subscription   (Followers: 13)
Anthropological Review     Open Access   (Followers: 24)
Antibiotics     Open Access   (Followers: 9)
Antioxidants     Open Access   (Followers: 5)
Antioxidants & Redox Signaling     Hybrid Journal   (Followers: 9)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apidologie     Hybrid Journal   (Followers: 5)
Apmis     Hybrid Journal   (Followers: 2)
APOPTOSIS     Hybrid Journal   (Followers: 9)
Applied Biology     Open Access   (Followers: 2)
Applied Bionics and Biomechanics     Open Access   (Followers: 7)
Applied Vegetation Science     Full-text available via subscription   (Followers: 10)
Aquaculture Environment Interactions     Open Access   (Followers: 4)
Aquaculture International     Hybrid Journal   (Followers: 26)
Aquaculture Reports     Open Access   (Followers: 3)
Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society     Open Access   (Followers: 7)
Aquatic Biology     Open Access   (Followers: 8)
Aquatic Ecology     Hybrid Journal   (Followers: 38)
Aquatic Ecosystem Health & Management     Hybrid Journal   (Followers: 16)
Aquatic Science and Technology     Open Access   (Followers: 4)
Aquatic Toxicology     Hybrid Journal   (Followers: 24)
Archaea     Open Access   (Followers: 4)
Archiv für Molluskenkunde: International Journal of Malacology     Full-text available via subscription   (Followers: 3)
Archives of Biological Sciences     Open Access  
Archives of Microbiology     Hybrid Journal   (Followers: 10)
Archives of Natural History     Hybrid Journal   (Followers: 8)
Archives of Oral Biology     Hybrid Journal   (Followers: 3)
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: 3)
Asian Bioethics Review     Full-text available via subscription   (Followers: 3)
Asian Journal of Biodiversity     Open Access   (Followers: 5)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Biology     Open Access   (Followers: 2)
Asian Journal of Biotechnology and Bioresource Technology     Open Access   (Followers: 1)
Asian Journal of Cell Biology     Open Access   (Followers: 6)
Asian Journal of Developmental Biology     Open Access   (Followers: 3)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 5)
Asian Journal of Nematology     Open Access   (Followers: 4)
Asian Journal of Poultry Science     Open Access   (Followers: 5)
Atti della Accademia Peloritana dei Pericolanti - Classe di Scienze Medico-Biologiche     Open Access  
Australian Life Scientist     Full-text available via subscription   (Followers: 2)
Australian Mammalogy     Hybrid Journal   (Followers: 8)
Autophagy     Hybrid Journal   (Followers: 4)
Avian Biology Research     Full-text available via subscription   (Followers: 6)
Avian Conservation and Ecology     Open Access   (Followers: 15)
Bacterial Empire     Open Access   (Followers: 1)
Bacteriology Journal     Open Access   (Followers: 1)
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)
Batman Üniversitesi Yaşam Bilimleri Dergisi     Open Access  
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  
Bio-Lectura     Open Access  
BIO-SITE : Biologi dan Sains Terapan     Open Access   (Followers: 1)
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
BioCentury Innovations     Full-text available via subscription   (Followers: 2)
Biochemistry and Cell Biology     Hybrid Journal   (Followers: 17)
Biochimie     Hybrid Journal   (Followers: 6)
BioControl     Hybrid Journal   (Followers: 6)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 8)
Biodemography and Social Biology     Hybrid Journal  
BIODIK : Jurnal Ilmiah Pendidikan Biologi     Open Access   (Followers: 1)
BioDiscovery     Open Access   (Followers: 2)
Biodiversidade e Conservação Marinha : Revista CEPSUL     Open Access  
Biodiversitas : Journal of Biological Diversity     Open Access  
Biodiversity Data Journal     Open Access   (Followers: 4)
Biodiversity Informatics     Open Access   (Followers: 1)
Biodiversity Information Science and Standards     Open Access   (Followers: 2)
Biodiversity: Research and Conservation     Open Access   (Followers: 27)
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 2)
Bioelectromagnetics     Hybrid Journal   (Followers: 2)
Bioenergy Research     Hybrid Journal   (Followers: 4)
Bioengineering and Bioscience     Open Access   (Followers: 3)
BioEssays     Hybrid Journal   (Followers: 11)
Bioethics     Hybrid Journal   (Followers: 18)
BioéthiqueOnline     Open Access  
Biofabrication     Hybrid Journal   (Followers: 5)
Biofilms     Full-text available via subscription   (Followers: 2)
Biogeosciences (BG)     Open Access   (Followers: 12)
Biogeosciences Discussions (BGD)     Open Access   (Followers: 3)

        1 2 3 4 5 6 7 8 | Last

Similar Journals
Journal Cover
Aquaculture International
Journal Prestige (SJR): 0.591
Citation Impact (citeScore): 2
Number of Followers: 26  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-143X - ISSN (Online) 0967-6120
Published by Springer-Verlag Homepage  [2626 journals]
  • Isolation and identification of pathogenic Vibrio spp. retrieved from
           diseased Litopenaeus vannamei and beneficial role of some functional
           probiotic bacteria for control
    • Abstract: Abstract The hepatopancreatic disease in shrimp has caused great economic losses in recent years, and it is necessary to identify the responsible pathogen and establish control methods. The present study aimed to identify the primary pathogenic bacteria in diseased Litopenaeus vannamei hepatopancreas (HP) and to explore the protective effects of functional bacteria on shrimp. Four pathogenic Vibrio spp. were isolated and identified from shrimp with hepatopancreatic disease, of which Vibrio harveyi HAH could be the primary pathogen causing higher rates of mortality (~ 73%) with observed symptoms. In addition, HAH had five virulence-related genes: luxR, flaB, toxR, vhhA, and vhhB. Anti-Vibrio bacterium M146 and quorum quenching (QQ) bacterium W1B were screened and used as a feed supplement. The results showed that M146 and W1B (dosed at 1.0 × 107 CFU/g) decreased the mortality of shrimp after challenge with HAH. Supplementation with M146 significantly increased the activities of alkaline phosphatase (AKP) and lysozyme (LZM), whereas supplementation with W1B had no significant effect. AKP and acid phosphatase (ACP) activities of shrimp supplemented with W1B showed a significant increase after infection with HAH, whereas a decrease in the activities of AKP and superoxide dismutase (SOD) was observed in the negative control (NC). Supplementation with M146 and W1B significantly decreased the relative messenger RNA expression of Relish and TRAF6. However, after infection with HAH, the M146 and W1B groups exhibited a different pattern of gene expression regulation compared with that in the NC group, which might suggest weakening of the virulence of the pathogen. The results suggest that these two bacteria can protect L. vannamei and that M146 not only inhibited the growth of HAH but also had an immunostimulatory effect on shrimp. On contrast, W1B did not improve the immunity of shrimp, so it is speculated that it may protect the host by affecting the quorum sensing (QS) system of pathogenic bacteria.
      PubDate: 2020-04-02
       
  • Effect of the total replacement of fishmeal with plant proteins and
           supplemental essential amino acids in the extruded diet on antioxidants
           genes, enzyme activities, and immune response in juvenile blunt snout
           bream
    • Abstract: Abstract Four diets were formulated with or without fishmeal (FM) and essential amino acid (EAA) supplementation fed to the blunt snout bream throughout 8 weeks. The results showed that total cholesterol level (TC) was decreased significantly against FM reduction (P < 0.05). Aspartate aminotransferase (AST), alanine transaminases (ALT), and alkaline phosphatase (ALP) activities were affected neither by FM reduction nor EAA supplementation (P > 0.05). Catalase (CAT) activity and glutathione (GSH) content were significantly augmented and diminished in the group fed diet 3 respectively (P < 0.05). Superoxide dismutase (SOD) activity and malondialdehyde (MDA) content did not alter either by FM reduction or EAA supplementation (P > 0.05). Glutathione peroxidase (GPx) activity was elevated significantly either by reducing FM or supplementing EAA (P < 0.05). The relative expression of nuclear factor erythroid 2-related factor 2 (Nrf2), Kelch-like-ECH-associated protein 1 (Keap1), and GPx was significantly augmented (P < 0.05) in the EAA-supplemented groups. Neither FM reduction nor EAA supplementation altered the relative expression of SOD (P > 0.05), whereas the relative expression of copper-zinc superoxide dismutase (Cu/Zn-SOD) decreased against FM reduction (P < 0.05). The relative expressions of Interleukin 8 (IL-8), tumour necrosis factor-α (TNF-α), interleukin 10 (IL10), and nuclear factor-kappa B (NF-κB) were diminished significantly in FM-reduced groups (P < 0.05). The supplementation of EAA significantly increased the relative expression of signal transducer and activator of transcription 4 (STAT4) (P < 0.05). In conclusion, the results revealed that dietary plant proteins with EAA supplementation significantly affected the physiological status and immune responses in blunt snout bream.
      PubDate: 2020-04-01
       
  • Outbreak of carp edema virus disease in cultured ornamental koi in a lower
           temperature in China
    • Abstract: Abstract Carp edema virus (CEV) is the pathogen of carp edema virus disease (CEVD), an emerging infectious disease with high morbidity and mortality worldwide. In the winter of 2016, a disease outbreak occurred in a koi pond in Chengdu, located in the southwest of China. The water temperature at that time was 11–13 °C. The clinical signs of the diseased koi were lethargy, unresponsiveness, enophthalmos, swollen gills, and hemorrhagic skin. Histopathological changes were observed in moribund fish, such as significant cell hyperplasia in the gill lamellae, and swelling and vacuolar degeneration in epithelial cells of the renal tubules and hepatocytes. Electron microscopy of renal tissues showed virions of a pox-like virus (200–235 nm diameter). The presence of specific 528 bp and 478 bp fragments was detected by nested PCR. An experimental infection demonstrated cumulative mortality of 15% (3/20) at a water temperature of 13 ± 2 °C. Furthermore, sequence analysis of the partial 4a genes showed that the CEV isolate (MG189372) in this study had 100% homology with a UK strain (KX254027). The evidence showed that the pathogen involved in this outbreak was CEV. To the best of our knowledge, this is the first report of carp disease caused by CEV at low temperature in China, demonstrating that CEV disease should be monitored in the cold season and at low temperatures. The findings are of profound significance to reducing the risk of CEVD outbreaks in carp aquaculture.
      PubDate: 2020-04-01
       
  • Enhancing the production of astaxanthin by mixotrophic cultivation of
           Haematococcus pluvialis in open raceway ponds
    • Abstract: Abstract Mixotrophic cultivation of Haematococcus is efficient to increase astaxanthin productivity. However, application of this technique in open bioreactors is restricted because of bacterial contamination. In this study, mixotrophic cultivation of Haematococcus was carried out successfully in an outdoor raceway pond. The Haematococcus cells grew on light first, and then acetate/acetic acid was supplemented when nitrate was depleted from the culture media. Under such conditions, Haematococcus cells grew on intracellular nitrogen pool, while bacterial reproduction was limited. The average astaxanthin productivity reached 140 mg m−2day−1, which is about 1.2 times that of the simple phototrophic cultivation. This study explores a potential way to enhance astaxanthin productivity, and the results are helpful to the development of the Haematococcus industries.
      PubDate: 2020-04-01
       
  • Comparative efficacy of mannan-oligosaccharides from two yeast species fed
           alone or in combination with probiotic Bacillus subtilis ATCC 6633 to
           Catla ( Catla catla ) juveniles
    • Abstract: Abstract Saccharomyces cerevisiae is the most commonly used source for mannan-oligosaccharides (MOS) in the animal feed industry. Recently, we proposed Wickerhamomyces anomalus SZ1 isolated and characterized from home-made curd that yield 33% higher MOS than S. cerevisiae as an alternative to the latter (Gupta et al. 2018). This report details the results of a 60-day performance feeding trial in Catla (Catla catla) fish aimed at evaluating comparative efficacy of MOS from W. anomalus (W-MOS) and S. cerevisiae (S-MOS) when fed at 0.4% rate solely or in combination with probiotic (PB) bacteria, Bacillus subtilis ATCC 6633 (106 CFU g−1 feed). One hundred and fifty juveniles were equally distributed in five groups, in triplicates, and were fed one of the five isocaloric and isonitrogenous diets viz. control, 0.4% S-MOS, 0.4% W-MOS, 0.4% S-MOS + PB and 0.4% W-MOS+ PB. Percent weight gain, specific growth rate (SGR) and food conversion ratio (FCR) at the end of experiment indicated that the growth performance of Catla fingerlings with dietary supplementation of 0.4% MOS (4 g kg−1) from either source was significantly better (P < 0.05) than control fish, but further potentiation of effects was observed in W-MOS only indicating species-specific synergistic complementation of pre-probiotics. Packed cell volume was increased with 0.4% MOS feeding, which was further augmented when probiotic was co-fed (P < 0.05). The modulation of activities of digestive (intestinal protease and amylase) (P < 0.01) and metabolic (liver and muscle ALT, AST, LDH, MDH) enzymes (P < 0.05) further supported the improved growth performance of fish. Body composition of fingerlings, at the end of feeding trial, fed 0.4% MOS from either source, alone or in combination with probiotic, was unaffected. It was concluded that MOS from W. anomalus is superior alternative to that from Saccharomyces cerevisiae (W-MOS) and can be used in feed industry along with probiotic in promoting better growth performances.
      PubDate: 2020-04-01
       
  • Revealing the profile of economically efficient mussel farms: a restricted
           data envelopment analysis application
    • Abstract: Abstract The level of technical efficiency (TE) of farms is a complex issue largely connected to the efficient use of available resources, which in turn determines their economic performance. Data envelopment analysis (DEA) is an established method to estimate TE; however, it is subject to drawbacks which sometimes reduce its ability to account differences in production scales. Indeed, the conventional DEA model allows total flexibility in the weights that a decision-making unit attaches to inputs and outputs, while in some cases, zero weights are attached to variables that are totally omitted in the efficiency analysis. Restricting efficiency weights in the DEA model, without of course eliminating the total weight flexibility assumption, guarantees zero weights, and prevents large differences in weights. In this study, an assurance region (AR) weight restricted model is applied on 66 mussel farms in order to calculate more comprehensive efficiency estimates and to obtain a meaningful and consistent picture of the efficient farm structure in economic terms, which could be potentially used for managerial suggestions, identification of best practices and innovations, and effective decision-making tool concerning mussel farm aquaculture. The cost share of the main production factors is used for imposing weight restrictions on the conventional DEA model, and a comparative descriptive technical and economic analysis of the efficient farms of the restricted and unrestricted DEA models is implemented. The results indicate that the structure of the efficient farm under the restricted DEA model is substantially diversified, formulating a new pattern of production system that achieves a higher economic performance.
      PubDate: 2020-04-01
       
  • Correction to: Behavior and physiological status of pond-cultured
           pikeperch ( Sander lucioperca ) broodstock effected by sexual interactions
           throughout semi-artificial reproduction
    • Abstract: The original article unfortunately contains interchanged first and family name of the authors.
      PubDate: 2020-04-01
       
  • Correction to: Extraction and recovery response of Penaeus indicus
           chitosan against Aeromonas hydrophila Ah17 infected snakehead murrel
           Channa striata
    • Abstract: The original version of this article unfortunately contains incorrect equation under the material and method section, in chitosan yield methods part of the formula.
      PubDate: 2020-04-01
       
  • An overview of the immunomodulatory effects exerted by probiotics and
           prebiotics in grouper fish
    • Abstract: Abstract While health benefits imparted by probiotics and prebiotics in various finfish have been extensively researched over the past few decades, little emphasis has been given to its role in immunomodulation in grouper fish health. From this billion-dollar aquaculture industry, the production of an estimated 100,000 tons per annum of grouper fish is required to fulfill the needs of the global market by 2020. Thus, this huge demand has resulted in a rapid rise of grouper fish farms, especially in the Asia-Pacific region. Unfortunately, grouper farming is often blighted by viral and bacterial diseases, which consequently devastate yields, resulting in economic losses. This review provides an overview of the functional role of probiotics and prebiotics, with specific emphasis on their immunomodulatory effects toward the advancement of grouper fish farming as one of the rising aquaculture commodities in the near future. Types of grouper-related diseases, probiotic strains, prebiotic types, dietary manipulations, immunological functions, and immunomodulatory mechanisms are reviewed and discussed in this article.
      PubDate: 2020-04-01
       
  • Competitiveness of Chinese and Indonesian tilapia exports in the US market
    • Abstract: Abstract In this study, we investigated the export performance and competitiveness of Chinese and Indonesian tilapia in the US market. We analyzed the factors that influence exports by using the constant market share model according to data from the USDA aquaculture database between 1996 and 2017. The results showed that the changes in the US market demand had a great impact on the tilapia industry in China and Indonesia but especially the latter. During 2014–2017, the product structures in China and Indonesia were not suitable to meet the demands of the US market, but Indonesian tilapia products exhibited stronger export performance compared with those from China. Changing the current status requires efforts to promote the transformation of Chinese tilapia into low supply, high quality, and high price products.
      PubDate: 2020-04-01
       
  • Effects of diet α-ketoglutarate (AKG) supplementation on the growth
           performance, antioxidant defense system, intestinal digestive enzymes, and
           immune response of grass carp ( Ctenopharyngodon idellus )
    • Abstract: Abstract This study was conducted to investigate the effects of diet 7.5 g/kg α-ketoglutarate (AKG) on the growth performance, antioxidant defense system, digestive enzymes, and immune response of grass carp (Ctenopharyngodon idellus). A total of 400 grass carp with an average body weight 10.81 ± 0.68 g was randomly allocated into 2 groups with 4 replicates of 50 fish respectively. The experiment was conducted in net cages (1.5 m × 1.5 m × 1.5 m) suspended in an indoor cement pool. Fish were fed a basic diet containing either 0 (control) or 7.5 g/kg AKG (supplemented diet). The experiment lasted for 8 weeks (56 days). Results indicated that compared with the control group, the final weight (FW), weight gain rate (WGR), specific growth rate (SGR), and protein efficiency ratio (PER) in the AKG group were increased significantly (P < 0.05). However, the feed conversion ratio (FCR) was decreased significantly (P < 0.05). The 7.5 g/kg AKG supplementation significantly increased the activities of glutamine synthetase (GS), glutathione peroxidase (GSH-Px), catalase (CAT), total superoxide dismutase (T-SOD), and hexokinase (HK), as well as the concentrations of glutathione (GSH), total antioxidant capacity (T-AOC), and complement 3 (C3) in blood (P < 0.05), while significantly decreased the concentrations of malondialdehyde (MDA) and hemoglobin (Hb) (P < 0.05). The GS activity and GSH concentration in hepatopancreas were increased significantly (P < 0.05), whereas the glycogen concentration in hepatopancreas, and the glycogen concentration and GS activity in the muscle were significantly decreased (P < 0.05). In addition, 7.5 g/kg AKG supplementation significantly increased the concentration of GSH and the activities of amylase, protease, and lipase in fore-gut, alkaline phosphates (ALP) in the mid-gut, and Na-ATP and Ca-ATP in the gill (P < 0.05), as well as γ-glutamyl transpeptidase (γ-GT) both in fore-gut and mid-gut (P < 0.05), whereas the activity of acid phosphatase (ACP) in the mid-gut was decreased significantly (P < 0.05). In conclusion, diet 7.5 g/kg AKG supplementation in grass carp may improve the growth performance and immune response and play crucial roles in regulating the activities of GS, antioxidant defense system, and digestive enzymes.
      PubDate: 2020-04-01
       
  • Genetic evaluation of Chinese shrimp ( Fenneropenaeus chinensis ) stock
           enhancement in the Yellow Sea and Bohai Sea based on mitochondrial DNA
           control region
    • Abstract: Abstract Stock enhancement is a fishery management approach involving the release of hatchery organisms to increase the abundance of natural fish or invertebrate population. In this study, genetic evaluation of Fenneropenaeus chinensis stock enhancement was carried out based on the mitochondrial DNA control region. The haplotype diversity (Hd) and nucleotide diversity (π) of broodstock populations were generally higher than that of recaptured populations. The molecular variance analysis (AMOVA) results demonstrated that genetic variance was in connection with the time of releasing and recapture. A significant pairwise FST value was only obtained between L1CY and C2LZ. But there was no obvious correlation between their geographical distance and genetic difference, confirming that time factor might be the leading cause of differences. Haplotypes shared by more than three individuals all could be recaptured, which indicated that the enhancement experiment was relatively successful. In general, the enhancement effect in 2012 was better than that of in 2013.
      PubDate: 2020-04-01
       
  • Fractal dimension of hepatopancreas of white shrimp Litopenaeus vannamei
           infected with Hepatobacter penaei bacteria (NHPB)
    • Abstract: Abstract In the present work, fractal geometry is applied to histological sections of the hepatopancreas tissue of white shrimp (L. vannamei) experimentally infected with Hepatobacter penaei bacteria (NHPB), in order to perform an analysis of the morphology adopted by the different cellular components damaged by this intracellular-type pathogen bacteria. The fractal dimension of the digital images of the histological sections was obtained by using a code written in Matlab, which uses the box counting method to determine the differences between areas infected with NHPB and without infection. The fractal dimension of histological sections of the uninfected hepatopancreas was less than the fractal dimension of the hepatopancreas infected by NHPB, generating novel information about the fractal morphological characterization of this type of biological systems in relation to this pathology.
      PubDate: 2020-04-01
       
  • Artificial reproduction of Anguilla anguilla : evaluation of biometrics
           characteristics of a population from Valle Campo Lagoon, Comacchio (Italy)
           
    • Abstract: Abstract One of the major problems in artificial eel reproduction is identification of broodstock with high performance reproductive characteristics. The aim of this study was to study population characteristics and the reproductive potential of eels (Anguilla anguilla) located in Valle Campo valley (Comacchio, Italy). A total of 200 eels/period (spring–summer and autumn–winter) were measured to obtain an external indicator of their maturation state. Morphometric parameters were used to calculate condition factor (K), eye index (EI) and pectoral fin length index (PFLI). Silver index analyses showed the lack of silver males and of fully mature females. Most represented females were yellow females at stage II. Silver females represented 27.9% of the population. Seasonal analysis shows how temperature reduction favoured the presence of silver females versus yellow females. Statistical analysis of EI, cranial (CI), PFLI and gonadosomatic (GSI) indexes showed that significant differences were found for EI, CI, PFLI and GSI between yellow and silver eels. No significant difference was found between stage III and IV silver eels, while a significant difference for EI was found between stage I and II yellow eels and for IC at stage II with respect to all other stages. The present study defined how Valle Campo could present environmental and trophic conditions which could favour precocious development of a population of silver females with a noticeable reproductive potential, to be used in open sea release or in artificial reproduction programmes. On the contrary, the valley seems to present unfavourable conditions for both development and sexual maturation of male eels.
      PubDate: 2020-04-01
       
  • Effect of hydraulic loading rate on the growth of koi carp ( Cyprinus
           carpio var. koi .) and Gotukola ( Centella asiatica (L.)) using
           phytoremediated aquaculture wastewater in aquaponics
    • Abstract: Abstract The study evaluates optimum hydraulic loading rate (HLR) based on the fish and plant production performance and nutrient removal percentage in aquaponics. The growth of Gotukola (Centella asiatica (L.))—a leafy vegetable as well as traditional medicinal plant—and koi carp (Cyprinus carpio var. koi.)—a high demand ornamental fish—were evaluated at three different HLRs, viz. 2.6 m day−1 (T1), 7.8 m day−1 (T2), and 13.0 m day−1 (T3). Treated aquaculture wastewater was utilized in a combination of the freshwater in 1:1 ratio with 2.1 kg m−3 fish stocking density. The highest fish mean length; weight; feed conversion ratio; specific growth rate; NH3, NO2−, and NO3− removal percentage; and plant growth parameters were observed. Considering fish (koi carp) and plants (Gotukola) growth parameters as well as nutrient removal percentages, a HLR of 7.8 m day−1 was found to be the optimum in aquaponics.
      PubDate: 2020-04-01
       
  • Pixelar index: a new quantitative approach for the assessment of
           reproductive condition in the purple sea urchin, Paracentrotus lividus ,
           by image analysis
    • Abstract: Abstract The assessment of the gametogenic cycle and gonadal stage in commercial species relevant for shellfisheries and aquaculture is essential for the optimal management of the resource. However, currently this assessment frequently relies on the subjective classification of the specimens into discrete stages of development, with a strong dependence on the observer. The present study developed a quantitative, continuous, and observer-independent method for the analysis of the gonadal stage of the edible sea urchin, Paracentrotus lividus. This new approach takes advantage of image analysis to assess in histological preparations of the gonads the cellular growth of germ cells and calculate a Pixelar index (PI). The PI can be calculated taking into account just the proportion of the area covered by germinal vs somatic cells in the gonad follicle (PI1) or computing also the empty space created in the follicle lumen after spawning (PI2), which reduces the variability of the index. In both cases, PI showed a bell-shaped dependence on the traditional gametogenic stage that could be fitted to a Gaussian model, providing a tool that can be used for the quantitative evaluation of effects on sea urchin gonads of any kind of environmental factors, from aquaculture rearing conditions to ecotoxicological effects of pollutants on wild stocks. Further assessment of intraindividual—both among gonads and within gonads—variability in this index will be necessary for refinement of this quantitative tool.
      PubDate: 2020-04-01
       
  • Growth enhancement of tropical abalone, Haliotis asinina L, through
           probiotic supplementation
    • Abstract: Abstract The use of probionts has been considered to be an effective technology in enhancing growth performances and survival rate of aquaculture species. This study examined the effect of three probiotic candidates (Bacillus amyloliquefaciens MA228, Enterobacter ludwigii MA208, and Pediococcus acidilactici MA160) on the growth and survival rates of juvenile abalone, Haliotis asinina L). The three probionts were incorporated as a mixture of two or three onto Gracilaria sp. and fed to juvenile abalone for 62 days. Then, specific growth rate (SGR), feed conversion ratio (FCR), and survival rate (SR) were measured. The results showed that the increments in weight and length were significantly higher (P < 0.05) in the abalone that received a mixture of probionts. While feed conversion ratio (FCR) was significantly lower than the control. The supplementation of B. amyloliquefaciens MA228 and E. ludwigii MA208 (2P) in the Gracilaria sp. resulted in an increase of 9% SGR in terms of weight and decreased FCR value 0.2 unit, compared with the control. However, there was no difference in the survival rates between the mix of 2 and 3 probionts, > 72% among the treatments and control. Our study shows that the growth of juvenile abalone could be improved through probiotic supplementation. Thus, E. ludwigii MA208 and B. amyloliquefaciens MA228 are considered potential probionts which can be used to shorten culture period of abalone aquaculture.
      PubDate: 2020-04-01
       
  • Development of the new microsatellite multiplex PCR panel and genetic
           variation of farmed snakeskin gourami, Trichopodus pectoralis
    • Abstract: Abstract Genetically distinct populations have been used to found genetically diverse base populations, which are a prerequisite for successful selective breeding programs. Genetic markers are very useful in this regard as a tool for characterization of genetic diversity. In the present study, a panel of eight multiplex microsatellite primers was developed and seven of them were used to assess genetic diversity of farmed snakeskin gourami, which have been domesticated for more than 30 years. The microsatellites developed showed number of alleles per locus (A) of 3 to 22 alleles, expected heterozygosity (He) range of 0.328–0.923, and Polymorphic Information Content (PIC) range of 0.227–0.915. Four farmed populations of snakeskin gourami (n = 50 fish/population) possessed moderate genetic diversity (FST = 0.056; pairwise FST = − 0.047–0.041; genetic distance = 0.034–0.087), with all but one population pair significantly different as revealed by pairwise FST. Population structuring assigned the studied populations to two clusters. Genetic variation within populations was characterized, with average number of alleles/locus of 6.7–8.0 and expected heterozygosity of 0.65–0.68. Effective population size ranged from 13.2 to 37.7. Our study was the first to report a multiplex microsatellite panel for snakeskin gourami, and it showed genetic distinction among farmed stocks of this species.
      PubDate: 2020-04-01
       
  • Temporal change in the spatial distribution of visual organic enrichment
           indicators at aquaculture sites in Newfoundland, Canada
    • Abstract: Abstract Growing salmon in sea cages results in the deposition of uneaten feed and wastes which can smother organisms, increase biological oxygen demand, and alter seafloor communities. At some sites with mainly hard-bottom substrates, opportunistic annelids and mat-forming bacteria are used as visual indicators of aquaculture waste and are monitored via drop camera imaging. Additionally, high organic matter sedimentation rates can result in the proliferation of microbes that release gas; this offgassing could also serve as a useful visual enrichment indicator. Little is known of how the distribution of opportunistic annelids, microbial mats, and offgassing might change over time and space, although coverage has important repercussions in some regulatory schemes. Here, we explore spatiotemporal distributions of offgassing, bacterial mats, annelids, and epibenthic taxon richness based on existing video-monitoring data collected along transects at four Newfoundland aquaculture sites in 2011–2012. A high degree of spatial and temporal patchiness was observed at both fallow and production sites, and combinations of time, transect, and distance to cage explained the distribution of bacterial mats, annelids, and taxon richness. Expected successional patterns resulting from organic enrichment or remediation were evident in some patches. Offgassing was observed only at fallow sites and may signal a distinct and persistent phase in organic matter degradation. Results highlight the spatial heterogeneity of benthic organic enrichment indicators across transects at Newfoundland aquaculture sites, with indicators appearing to form a mosaic of patches undergoing different stages of enrichment or recovery.
      PubDate: 2020-04-01
       
  • Acute toxicity of the pesticide trichlorfon and inhibition of
           acetylcholinesterase in Colossoma macropomum (Characiformes:
           Serrasalmidae)
    • Abstract: Abstract In Brazilian fish farms, trichlorfon has been widely used to control acanthocephalan infections in Colossoma macropomum. Toxicity tests were conducted to estimate the median lethal concentration (LC50–96 h) and evaluate the effects of trichlorfon on acetylcholinesterase (AChE) and glutathione S-transferase (GST) from different tissues of C. macropomum. The LC50–96 h of trichlorfon was estimated to be 0.87 mg L−1. In the sublethal toxicity tests, concentrations of 0.26 mg L−1 (30% of LC50–96 h) and 0.43 mg L−1 (50% of LC50–96 h) were used. AChE and GST activities were measured in the brain, muscle, intestine, and liver. In vitro studies were conducted to estimate the kinetic properties and half-maximal inhibitory concentration (IC50) values of AChE in the brain and muscle for trichlorfon. In the sublethal toxicity experiments, inhibition of more than 90% of AChE in the brain, muscle, and intestine was observed. However, the activity of GST did not vary in any of the tissues studied. This finding suggests that trichlorfon is not metabolised by this enzyme. The in vitro assay results suggest that trichlorfon tends to be a classic uncompetitive inhibitor of AChE in both the brain and muscle, since Km and Vmax values decrease, while the slope remains unchanged. The IC50 values ​of muscle AChE are lower than those of the brain. All these results show that C. macropomum has low tolerance to this pesticide and suggest that brain AChE can be used as a biochemical biomarker, while muscle AChE may be used as an indicator of mortality in toxicological studies.
      PubDate: 2020-04-01
       
 
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