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Publisher: Springer-Verlag (Total: 2574 journals)

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Showing 1 - 200 of 2574 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 4)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 11, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 29, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 8, SJR: 0.752, CiteScore: 3)
Abdominal Radiology     Hybrid Journal   (Followers: 18, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
Academic Psychiatry     Full-text available via subscription   (Followers: 30, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 9, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 31, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (Followers: 1, SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 19, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 7, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 3, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 11, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 25, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 2, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 4, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 4, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 19, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
Adaptive Human Behavior and Physiology     Hybrid Journal  
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 28, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 19, SJR: 1.005, CiteScore: 2)
Adolescent Research Review     Hybrid Journal  
Adsorption     Hybrid Journal   (Followers: 5, SJR: 0.703, CiteScore: 2)
Advanced Composites and Hybrid Materials     Hybrid Journal  
Advanced Fiber Materials     Full-text available via subscription  
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Astronautics Science and Technology     Hybrid Journal  
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 40, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 21, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 58, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 35, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.475, CiteScore: 2)
Advances in Neurodevelopmental Disorders     Hybrid Journal  
Advances in Polymer Science     Hybrid Journal   (Followers: 49, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 3, SJR: 0.673, CiteScore: 2)
Aerosol Science and Engineering     Hybrid Journal  
Aerospace Systems     Hybrid Journal  
Aerotecnica Missili & Spazio : J. of Aerospace Science, Technologies & Systems     Hybrid Journal  
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 11, SJR: 0.825, CiteScore: 1)
African Archaeological Review     Hybrid Journal   (Followers: 21, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.235, CiteScore: 0)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 6, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Open Access   (Followers: 15, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Open Access   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Open Access   (Followers: 15, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 9, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 16, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 7, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 2)
AMBIO     Hybrid Journal   (Followers: 10, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 17, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 29, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 9, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 18, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 6, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 3, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 16, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 7, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 10, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 6, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 6)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 3, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 23, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 19, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 13)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 35, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 11, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 11, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 13)
Annals of PDE     Hybrid Journal  
Annals of Regional Science     Hybrid Journal   (Followers: 9, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 11, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 15, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 9, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 3, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 18, SJR: 0.21, CiteScore: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 4, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 53, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 7, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 9, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 15, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 10, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (Followers: 1, SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 67, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 10, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 26, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 22, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 26, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 37, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 3, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 14, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 22, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 68, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 169, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 18, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 9, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 9, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 11, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 18, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 17, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 6, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 3, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.766, CiteScore: 1)
arktos : The J. of Arctic Geosciences     Hybrid Journal  
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 12, SJR: 0.937, CiteScore: 2)
Artificial Intelligence Review     Hybrid Journal   (Followers: 21, SJR: 0.833, CiteScore: 4)
Artificial Life and Robotics     Hybrid Journal   (Followers: 10, SJR: 0.226, CiteScore: 0)
Asia Europe J.     Hybrid Journal   (Followers: 4, SJR: 0.504, CiteScore: 1)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.479, CiteScore: 1)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 17, SJR: 1.185, CiteScore: 2)

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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  [2574 journals]
  • The role of live fish trade in the translocation of parasites: the case of
           Cystidicola farionis in farmed rainbow trout ( Oncorhynchus mykiss )
    • Abstract: Cystidicola farionis is a nematode of the swim bladder that parasitizes Salmonidae and Osmeridae families, with a range of diffusion in Europe, Asia, and North America. During a fish health monitoring performed in July 2017 in a trout farm located in northwest Italy, a prevalence of 70% for C. farionis was recorded in rainbow trout from a unique tank. In order to clarify the first occurrence of this parasite in northwest Italy, a total of 180 specimens were analysed in different seasons to obtain prevalence, mean intensity, and mean abundance of infestation. Moreover, amphipods were also sampled during each fish sampling campaign. Only fish sampled in August 2017 were positive for C. farionis, since fish were then sold and replaced with a new batch. All isolated nematodes were identified by morphological criteria as subadults (L4), but not sexually matured. All examined amphipods (genus Gammarus) resulted negative for the presence of the parasite. The most probable explanation of this report was due to the movement of a single fish batch from northeast Italy, previously described as an endemic area for this parasite. The absence of the parasite in the amphipods and consequently in other fish batches from other tanks are due to the lifetime cycle of the parasite that had no time to infect new hosts.
      PubDate: 2019-12-01
  • Autogenous bacterins cross-protection as a trial for Streptococcosis
           control in Oreochromis niloticus
    • Abstract: The present work investigated experimentally a rapid, effective and inexpensive control to streptococcosis, and the role of Streptococcus iniae as a major cause for mass mortalities of cultured Oreochromis niloticus in Kafrelsheikh, Egypt, in the summer of 2017; mass mortality was associated with poor water quality, and cultured naturally infected O. niloticus showed corneal opacity, congestion, and deep haemorrhagic ulceration in the dorsal region. S. iniae was identified as a causative agent by traditional and PCR techniques. The highest incidence of S. iniae was in the liver. Choosing vaccination as a control was experimentally investigated; the superiority of Streptococcus agalactiae FKC bacterin was related to the antibody titre, which was higher than S. iniae bacterin. The relative level of protection values were 79% and 23% in fish challenged with S. agalactiae and vaccinated with FKC of either S. agalactiae or S. iniae, respectively. These values were 56% and 74% in fish challenged with S. iniae and vaccinated with FKC of either S. agalactiae or S.i niae, respectively. In conclusions, autogenous bacterins of S. agalactiae or S.iniae induced cross-protection against S. agalactiae and S. iniae, in O. niloticus. The protection was superior to a S. agalactiae FKC vaccine, which could be a useful means for the prevention and control of streptococcosis.
      PubDate: 2019-12-01
  • Predicting uptake of aquaculture technologies among smallholder fish
           farmers in Kenya
    • Abstract: In Africa, many governments and development agencies have promoted aquaculture as a panacea for household food security, rural development, and poverty reduction. However, aquaculture production in the continent remains low despite significant investments in research and technology development. While numerous initiatives have been directed at technological innovation and transfer, their present scale of uptake is very slow and therefore inadequate to achieve transformational change envisaged in the 2030 Agenda for sustainable development. In this paper, we aim to (1) critically analyze the factors that influence fish farmer’s perceptions, attitudes, and behaviors toward technology adoption; and (2) to determine the impacts of technology adoption on farmer’s livelihoods. Primary data were collected using a self-administered digitized questionnaire to 331 randomly selected farmers in Kenya. Multivariate logistic regression models were used to analyze data. Results revealed that variables including secondary education, diversified on-farm activities, farm size, production levels, attendance of extension training, ease of understanding, and ease of handling technologies were positive and significant predictors of aquaculture technology adoption. However, 30% of fish farmers were categorized as high adopters of novel aquaculture technologies, implying that there are gaps in technical skills hindering adoption of innovative technologies and best management practices. To facilitate learning and uptake of technologies and good practices by farmers, a range of aquaculture-related extension and communication materials, including posters, hard copy information leaflets and brochures of recipes in appropriate languages, short video presentations, and radio features, should be commissioned to support the smallholder farmers.
      PubDate: 2019-12-01
  • β-Carotene-enriched Artemia as a natural carotenoid improved skin
           pigmentation and enhanced the mucus immune responses of platyfish
           Xiphophorus maculatus
    • Abstract: The present study investigated the effects of enriched Artemia franciscana with β-carotene of Dunaliella salina on color, skin carotenoid, and mucosal immune responses of platyfish, Xiphophorus maculatus. To this end, one hundred and eighty platyfish with an initial weight of 0.9 ± 0.03 g were randomly assigned into four groups in triple and were daily fed on three times. The first and second groups were fed with commercial food (control) and unenriched A. franciscana (Un-EA), respectively. In addition, the third and fourth groups were fed with enriched A. franciscana with castor oil (oil-EA) and enriched A. franciscana with β-carotene (β-carotene EA) for 8 weeks, respectively. Based on results, the highest amount of carotenoids (112.4 ± 22.79 μg g−1) was significantly observed in the group fed with β-carotene EA while the lowest amount (24.31 ± 2.36 μg g−1) was found in the group fed Un-EA. As regards lysozyme, total immunoglobulin, and alkaline phosphatase activity of the mucus, the highest amounts were detected in fish with β-carotene EA as 84.5 ± 19.09 mg dL−1, 6.4 ± 0.41 mg dL−1, and 477 ± 39.59 U L−1, respectively. Based on skin colorization results, the group fed with β-carotene EA had no significant difference regarding the transparency, yellow color, and opacity, while a* index significantly increased in this group in comparison with the control group. However, the Hue index significantly decreased in the β-carotene EA group compared with the control group. In conclusion, A. franciscana enriched with β-carotene of D. salina enhanced the mucosal immune responses and improved the skin carotenoids as well as a* index in platyfish X. maculatus.
      PubDate: 2019-12-01
  • Study of the requirements of dietary cholesterol at two different growth
           stages of Pacific white shrimps, Litopenaeus vannamei
    • Abstract: Two 8-week feeding experiments were conducted to investigate the cholesterol requirements of Litopenaeus vannamei at two different growth stages—with initial body weights of 0.61 ± 0.00 g (juvenile) and 4.25 ± 0.00 g (subadult). Six diets containing cholesterol (C) 0.03% (FM-fish meal), 0.09% (0.05% C), 0.14% (0.1% C), 0.27% (0.2% C), 0.47% (0.4% C), and 0.90% (0.8% C) were prepared with red fish meal, dehulled soybean meal and peanut meal as the protein source, and fish oil as the fat source. Two levels of phytosterol (P) substitutes—0.05% (0.05% P) and 0.8% (0.8% P)—for dietary cholesterol were evaluated. Results showed dietary cholesterol levels had significant effects on the weight gain rate (WGR), specific growth rate (SGR), and feed conversion ratio (FCR) of juveniles (P < 0.05). Crude fat in the 0.05% C and 0.1% C groups of subadults was significantly higher than that in the FM group (P < 0.05). The contents of CHOL, HDL, LDL, and liver CHOL were significantly associated with the content of cholesterol (P < 0.05). The dietary cholesterol proportion significantly affected serum AST and ALT (P < 0.05). Phytosterol supplementation presented growth-promoting effects for juvenile L. vannamei. A broken-line equation for weight growth showed the optimum dietary cholesterol requirement was 0.16% for L. vannamei juveniles (0.61 ± 0.00 g), and no extra dietary cholesterol supplementation was needed for L. vannamei subadults (4.25 ± 0.00 g).
      PubDate: 2019-12-01
  • Microencapsulation of anthocyanins from roselle ( Hibiscus sabdariffa )
           and its application on a pigment supplied diet to fantail goldfish (
           Carassius auratus )
    • Abstract: Hibiscus sabdariffa has gained an important position in the food industry because of its high anthocyanins content, related to the persistent red calyx of its flowers as the major component. Moreover, it has been used as a food colorant and active ingredient to develop food with some health benefits. The effect of addition of microencapsulated anthocyanins from Hibiscus sabdariffa in a fish feed was evaluated using Carassius auratus as a study model. Anthocyanins were microencapsulated with maltodextrins (10 DE) and microcapsules structure was analyzed by scanning electron microscopy. Microcapsules were added to fish diet (D) at 150, 300, and 450 mg anthocyanin/kg of diet. Fantail goldfish were feeding for 8 weeks and the feed intake (FI), feed conversion ratio (FCR), growth rate (GR), specific growth rate (SGR), survival, and weight gain (WG) were evaluated. Skin chromatophores from the head, dorsal, and caudal fin of each treatment were observed by light microscopy. Microencapsulation efficiency was 90 ± 0.2%. The microcapsules showed a spherical shape, the mean size was 4.0 μm, and the powder showed a pink-red color. Feed intake and survival were similar to all diets (p > 0.05). D150 and D300 showed a significant variation in GR, SGR, and WG (p < 0.05) compared with other diets. Fish fed with D450 showed the highest increase in color compared with control diet; however, fish size is lower than D300. Size and color are important parameters in the marketing of Carassius, and these results suggest that microencapsulation can be used as anthocyanins carrier during fish diet manufacture being an alternative to provide natural pigments that enhance growth and pigmentation of fantail goldfish.
      PubDate: 2019-12-01
  • Saprolegnia parasitica impairs branchial phosphoryl transfer network in
           naturally infected grass carp (Ctenopharyngodon idella): prejudice on
           bioenergetic homeostasis
    • Abstract: Precise coupling of spatially separated intracellular adenosine triphosphate (ATP) producing and ATP-consuming exerts a key role in bioenergetic balance, and the phosphoryl transfer network, catalyzed by creatine kinase (CK), adenylate kinase (AK), and pyruvate kinase (PK), is fundamental in energetic homeostasis of tissues with high-energy requirements, as the branchial tissue. This whole system is very sensitive, and our hypothesis is that it can be altered in cases of infectious diseases in fish, such as that caused by the oomycete Saprolegnia parasitica. The effects of S. parasitica infection on gills remain poorly understood and limited only to histopathological studies. Thus, the aim of this study was to evaluate whether natural infection by S. parasitica impairs the enzymes of the phosphoryl transfer network in gills of grass carp (Ctenopharyngodon idella), as well as the pathways involved in this inhibition. In this study, we used sick carp and compared to healthy carp, fish of similar age and receiving the same feed, but allocated in different tanks. Branchial CK (cytosolic and mitochondrial) activity and ATP levels decreased in infected fish compared to uninfected on day 7 post-infection (PI), while no significant difference was observed between groups regarding branchial AK and PK activities. Branchial sodium-potassium ion pump (Na+, K+-ATPase) activity decreased in infected carp compared to uninfected on day 7 PI, while reactive oxygen species (ROS) and thiobarbituric acid reactive substance (TBARS) levels were higher. Gill histopathology revealed massive necrosis, loss of branchial epithelium, and detachment of the epithelium interlayer with structural loss of secondary lamellae. Based on these data, the impairment of CK activity elicited by S. parasitica caused an impairment in branchial energetic homeostasis, reducing the ATP availability in the gills and provoking an impairment on Na+, K+-ATPase activity. Moreover, the inhibition on CK activity appears to be mediated by ROS overproduction and lipid peroxidation, which contribute to disease pathogenesis linked to branchial tissue.
      PubDate: 2019-12-01
  • Characterization of the immunological factors in turbot ( Scophthalmus
           maximus ) seminal plasma and their correlation with sperm quality
    • Abstract: In this study, the concentration/activity of the immune components in the turbot (Scophthalmus maximus) seminal plasma at four time points with the intervals of 2 weeks has been summarized. The results showed that the concentrations of transferrin (TF), transforming growth factor-βs (TGF-βs), complement 3 (C3), IgM and interferon-1β (IL-1β) varied as experiment went on; it was the same with the activities of protease, lactate dehydrogenase and lysozyme. The correlation analysis showed that C3 and IgM were most positively related to motility and straight-line velocity (VSL)/curvilinear velocity (VCL), whereas protease was most negatively correlated with motility and VSL/VCL. This study highlighted the importance in the necessity and possibility in improving the sperm quality during the actual production.
      PubDate: 2019-12-01
  • How changes in water quality under the influence of land-based trout farms
           shape chemism of the recipient streams—case study from Serbia
    • Abstract: A total of eight trout farms with different production capacities located in highland regions of Serbia were selected for testing of their influence on water parameters of the recipient streams at 46 sites seven times in the course of a year. All of the trout farms can be divided into two groups with respect to the relationship of the values of the parameters recorded at their outlets and downstream sites and those recorded at the control sites. The study showed that trout farms most often cause a statistically significant increase in the contribution of fine particulate organic matter (FPOM %), in the concentrations of NH3, NH4+, and PO43− and in the values of total phosphorous (Pt) and water temperature (tw). On the other hand, they cause a statistically significant decrease in the values of dissolved oxygen. In our study, the parameter defined as the ratio of the annual production of a trout farm to the minimal water discharge (Pr/Qmin) showed a high degree of correlation with the majority of analysed parameters, proven to be a good predictive model for testing the farm’s influence on the recipient stream.
      PubDate: 2019-12-01
  • Efficiency of pumpkin ( Cucurbita pepo ), sweet wormwood ( Artemisia annua
           ) and amaranth ( Amaranthus dubius ) in removing nutrients from a
           smallscale recirculating aquaponic system
    • Abstract: In aquaponic systems, plants absorb dissolved nutrients from aquaculture wastewater for their growth. The removal of nutrients allows reuse of water and minimises wastewater discharge to the surrounding environment. This study evaluated the relative nutrient removal efficiencies of three plant species and the performance of Nile tilapia (Oreochromis niloticus) in a small-scale aquaponic system. Three aquaponic systems were assigned as treatments PU (pumpkin), SW (sweet wormwood) and AM (amaranth). Physical-chemical water quality parameters were measured in the fish tanks as well as hydroponic inlets and outlets. Fish sampling was done every 2 weeks for 60 days. Results showed significantly (p < 0.05) lower nutrient concentrations in the hydroponic outlets than the inlets. There was no significant difference in nutrient removal efficiency of the plants (p > 0.05) for all the tested nutrients except for phosphorus. Phosphorus removal was substantially high in PU (75.5 ± 16.8%) than SW (47.36 ± 14.5%) and AM (40.72 ± 13.2%). In addition, the SW system had better (p < 0.05) relative growth rate (0.06 ± 0.00) than that of PU (0.05 ± 0.00) and AM (0.05 ± 0.00). Nitrogen and phosphorus content in plant tissues was significantly high (p < 0.05) in SW and PU plants respectively. Water quality parameters had a significant influence on the growth of fish (p < 0.05). The growth of fish was not different (p > 0.05) in the three treatments. The findings indicate that the tested plants can reduce nutrients in aquaculture discharge water.
      PubDate: 2019-12-01
  • Impact of commercial probiotics on growth parameters of European catfish (
           Silurus glanis ) and water quality in recirculating aquaculture systems
    • Abstract: This study aimed to establish the impact of commercial probiotics on European catfish growth parameters and water quality in recirculating aquaculture systems. For the study, the European catfish were placed in two tanks with 45 fish in each tank. Average body weight and length at the beginning of the study were 133.0 g and 27.0 cm, respectively. Rearing conditions and feeding regime were identical, and the only difference was that 1 ml of commercial probiotics was poured into the water of one experimental tank every other day. The experiment lasted for 42 days. Weight and length were measured every 2 weeks. After each measurement, European catfish growth parameters, feed conversion ratios, and feed efficiency were established. After the end of the study, it was established that there were significant differences between specific growth speed, daily growth index, feed conversion ratio, and feed efficiency (P < 0.05) for the fish reared in two experimental groups. Statistically significant differences in the water parameters were established among ammonia, nitrite, and dissolved oxygen concentrations (P < 0.05). Differences in temperature, nitrates, and pH were statistically insignificant. The results of this study showed that commercial probiotics can be used in the European catfish culture to enhance water quality, feed efficiency, and growth performance.
      PubDate: 2019-12-01
  • Impact of different rearing systems on survival, growth and quality of mud
           crab ( Scylla paramamosain ) megalopae reared from early zoeae
    • Abstract: This study aimed to compare the effects of four different rearing systems—namely clear water, green water, recirculating water and biofloc water systems—on survival, growth and quality of mud crab (Scylla paramamosain) megalopae reared from early zoeae. Twelve 60-L plastic buckets filled with 50 L of disinfected seawater were stocked with 20 larvae of zoea 1 (Z1) L−1. The larvae were fed both probiotic-enriched L-strain rotifers (Brachionus plicatilis) and probiotic-enriched Artemia (Artemia franciscana) in all systems. After 20 days of culture, the green water system resulted in the highest survival to megalopae than all the other systems. The survival of megalopae reared under the biofloc water system was similar to that of the clear water system, but both systems exhibited higher survival than the recirculating water system. However, larval growth performance was not affected by the various rearing systems. The quality of megalopae produced under these systems was determined by ammonia and simulated transport stress tests. The ammonia stress test did not show a significant difference in the quality of megalopae, but the simulated transport stress test demonstrated a significant effect of rearing system on the quality of mud crab megalopae. The resistance to the air exposure until the end of the 48 h of transport was observed in the green water system. Overall, the results of the present study revealed that the green water system is the most suitable for rearing Scylla paramamosain larvae from Z1 to megalopa stage.
      PubDate: 2019-12-01
  • Rainbow trout ( Oncorhynchus mykiss ) adaptation to a warmer climate: the
           performance of an improved strain under farm conditions
    • Abstract: The change registered in water temperature over recent years has represented a considerable challenge for the culture of salmonid fishes in terms of thermal stress. However, previous trials with Australian, Japanese, and Argentinean rainbow trout lines suggested that improvements in thermal performance might be possible. The aim of this work was to explore performance, i.e., the survival, malformations, food intake, growth, feed conversion efficiency, condition factor, thermal tolerance, and preferred temperature of a number of F1 families (wild thermal resistant male × farmed female) in order to formulate proposals for future work. The performances evaluated showed significant differences between F1 and control families, but no major heterogeneity within F1 families. The incidence of complex malformations, lower in F1 families than in controls, could indicate an advantage due to lower homozygosity. Thermal tolerance varied within F1 families but preferred temperature did not. Survival data suggested that chronic exposure to 20.5 °C had a lethal effect on control families. However, F1 families acclimated to 20.5 °C over a long period of time (ca. 109 days) preferred a mean temperature of 20.2 ± 0.2 °C, a final temperature preference substantially higher than those observed for other populations and strains of the species. Although growth differences between control and F1 families should be considered with caution, since no family was selected by growth in this work, it appears that simple selection by growth could be all that is necessary before beginning the process of introducing these families into farmed lines.
      PubDate: 2019-12-01
  • Spirulina platensis in rainbow trout ( Oncorhynchus mykiss ) feed: effects
           on growth, fillet composition, and tissue antioxidant mechanisms
    • Abstract: An experiment was conducted to investigate the effects of Spirulina platensis (SP) on growth, fillet composition, and intestinal, skin, and gill mucosal antioxidants of rainbow trout, Oncorhynchus mykiss (initial weight 17.18 ± 0.59 g). One-hundred and thirty-five fish were randomly distributed among nine cement tanks (1.8 m × 022 m × 0.35 m) with 15 fish per tank. Three isonitrogenous (37.8% crude protein) feeds containing either 0, 2.5, or 5% SP were prepared, randomly assigned to triplicate tanks of fish, and given at 2% body weight per day for 7 weeks. At the end of the trial, fish in each tank were assessed for growth (final weight, thermal growth coefficient), condition factor, fillet composition, mucosal antioxidant activity, and gene expression analysis related to the antioxidant enzymes catalase, glutathione peroxidase 1, and glutathione S-transferase. Neither growth nor fillet composition was influenced by inclusion of SP in feed. Total antioxidant activity in three mucosal tissues including the intestine, skin, and gill was significantly increased by 2.5% SP whereas administration of 5% SP only increased total antioxidant activity in the intestine. Feeding fish with 2.5% and 5% SP could upregulate the expression of catalase in the intestinal tissue whereas 5% SP enhanced the expression of glutathione peroxidase 1 in this tissue. Glutathione S-transferase gene expression was also increased in the intestinal and skin tissues of fish administrated with 2.5% SP while in the fish that received 5% SP-supplemented diet, an upregulation of this gene was only noted in the intestinal tissue. It was concluded that 2.5% SP had a potential to enhance some antioxidant parameters mostly in the intestine, followed by the skin and gill.
      PubDate: 2019-12-01
  • Multienzymatic capacity of cultivable intestinal bacteria from captive
           Litopenaeus vannamei (Boone, 1931) shrimp reared in green water
    • Abstract: Equilibrium between the gastrointestinal bacterial population and the environment is a critical factor for the health of captive aquatic animals. The bacterial enzymes are fundamental for proper nutrition and pathogen resistance in shrimp. Therefore, enzymatic profiles reveal essential characteristics for the selection of probiotic strains that can improve animal development. In this work, we analysed shrimp from a green water system where infectious myonecrosis virus (IMNV) was present. We isolated transient and intestine resident bacterial populations, characterising eight functional groups through different culture media. To identify each isolated bacteria, we used sequences from regions V6–V8 of the 16S rRNA. To determine viral load of shrimp samples, we used real-time PCR. The number of colony forming units (CFU) was similar between IMNV-infected and IMNV-uninfected shrimps. The growth of transient bacteria was higher than the growth of resident. In general, lipolytic bacteria presented higher frequency and genus diversity than the other functional groups. All groups showed higher frequency among transitory bacteria, except the amylolytic functional group, which was more frequent among the resident. We found two major orders of cultivable bacteria, Vibrionales and Bacillales. The genus Vibrio was predominant among the Vibrionales, while Staphylococcus and Bacillus were the most frequent among the Bacillales. Recorded Vibrionales and Bacillales included pathogenic and beneficial species of high importance for aquaculture. The results presented here will serve as a basis for improving the nutritional and health conditions of Litopenaeus vannamei in green water farming systems.
      PubDate: 2019-12-01
  • Yeast cell walls stimulate viability, respiratory burst, and phagocytosis
           in channel catfish ( Ictalurus punctatus ) head-kidney macrophages
    • Abstract: Yeast cell wall (YCW) preparations are important nutritional additives in the aquaculture industry. Head-kidney macrophages play important roles in innate immune functions in fish. However, the mechanisms underlying their stimulation are not yet characterized. The purpose of this study was to investigate the effects of YCW on immunological functions of channel catfish (Ictalurus punctatus) head-kidney macrophages. Our results showed that YCW preparations not only improved the proliferation and phagocytosis of macrophages but also induced the secretion of reactive oxygen species (ROS), nitric oxide (NO), inducible nitric oxide synthase (iNOS), and cytokines, such as tumor necrosis factor-α (TNF-α) and interleukin 1β (IL-1β). At a concentration of 500.0 μg/mL, YCW preparations stimulated macrophage proliferation and phagocytosis to 1.98 and 1.8 times, respectively, when compared with the negative group. Equally, YCW preparations raised the production of NO by inducing iNOS and ROS in a concentration-dependent manner. Furthermore, these preparations enhanced TNF-α and IL-1β mRNA levels to multiple digits from 1.2 to 3.0 times, respectively. In conclusion, the stimulatory effects of YCW on the phagocytic activity of the fish macrophages were associated with respiratory bursts coupled with nitric oxide production.
      PubDate: 2019-12-01
  • High mortalities caused by Aeromonas veronii :identification,
           pathogenicity, and histopathologicalstudies in Oreochromis niloticus
    • Abstract: The current study planned to identify suspected causes of mass mortalities in Oreochromis niloticus at private fish farms in Port Said Governorate, Egypt, during the 2017 summer season. One hundred twenty diseased moribund O. niloticus fish were randomly collected from different locations. The examined fish showed lethargy, dark skin, bilateral exophthalmia with corneal opacity, and varying degrees of ulcers. Internal examination revealed generalized inflammation, congestion, hemorrhaging, and enlargement of most internal organs. Identification was accomplished through analytical profile index (API) 20E and polymerase chain reaction (PCR) and confirmed by sequencing and phylogenetic analysis. An antibiogram was constructed based on results from a disc diffusion test. Experimental infection was also performed and showed 80% mortality. Virulence genes were also assayed. Histopathological examination of experimentally challenged fish revealed prominent pathological lesions (mainly necrosis), degenerative changes, and cellular vacuolation. In conclusion, Aeromonas veronii can be considered one of the main causes of summer mass mortalities in O. niloticus in the study area.
      PubDate: 2019-12-01
  • Dietary β-1,3/1,6-glucans improve the effect of a multivalent vaccine in
           Atlantic salmon infected with Moritella viscosa or infectious salmon
           anemia virus
    • Abstract: The immunomodulatory properties of β-glucans are well documented for several animal species. However, little is known on their use as enhancers of non-specific and specific responses against Moritella viscosa and infectious salmon anemia (ISA) virus, which are two major pathogens affecting the Atlantic salmon aquaculture industry. The present study assessed the effects of dietary β-1,3/1,6-glucans (MacroGard®) and vaccination on the survival of Atlantic salmon (Salmo salar) post-smolts challenged with M. viscosa or ISA virus. Dietary supplementation decreased mortality in both unvaccinated (55.4%; RPSend 19.9) and vaccinated (9.3%; RPSend 86.6) M. viscosa-challenged fish compared to the non-supplemented groups (69.1% and 28.3% mortality in unvaccinated and vaccinated fish, respectively; RPSend 59 for vaccinate non-supplemented fish). Similarly, mortality of ISA virus-challenged fish decreased from 87.5% in vaccinated fish without supplementation (RPSend 9.2) to 70.9% in the supplemented and vaccinated group (RPSend 26.4). In summary, these findings show that dietary β-glucans increase Atlantic salmon resistance and improve the protective effect of vaccines against the tested pathogens.
      PubDate: 2019-12-01
  • Molecular identification of water molds (oomycetes) associated with chum
           salmon eggs from hatcheries in Japan and possible sources of their
    • Abstract: Oomycete infection of various freshwater animals, including salmonid eggs, causes significant economic damage to aquaculture worldwide. In this study, we detected oomycetes in infected chum salmon Oncorhynchus keta eggs at two hatcheries in northern Japan, in the source water used for egg incubation, and in the air at the hatcheries to clarify the source(s) of oomycete transmission using a DNA molecular marker. Seven oomycete taxa, belonging to Saprolegniaceae and Pythiaceae, were detected from the infected eggs. From the source water used for egg incubation and the air at the hatcheries, nine oomycete taxa, including those found on infected eggs, were detected, suggesting that both water and air are potential sources of oomycete transmission. There is no report of airborne transmission of these oomycetes detected in this study so far. Regarding protection and sterilization against oomycete infection in aquaculture hatcheries, not only water used at hatcheries but also the air in hatcheries may need to be considered hereafter.
      PubDate: 2019-12-01
  • Colonization of enzymatic bacterial flora in biofloc grown shrimp Penaeus
           vannamei and evaluation of their beneficial effect
    • Abstract: Experiments were conducted to explore the colonization of beneficial bacteria in shrimp Penaeus vannamei grown in different sources of biofloc and clear water. Beneficial effect in terms of extracellular enzyme production and antibiofilm activity of the isolated strains was determined. Heterotrophic bacterial population were isolated by using different agar plates and resulted in isolation of 94 isolates in total. Extracellular enzyme production such as amylase, protease, lipase, cellulase, xylanase, and pectinase were screened. Antibiofilm activity of culture supernatants of enzymatic strains against pathogenic Vibrio was also determined. Out of 94 strains screened, 36 strains were found to produce amylase enzyme, 20 strains protease, 27 strains lipase, 6 strains cellulase, and 8 strains xylanase. Totally, 21 isolates selected for further identification and different species of Cobetia, Exiguobacterium, Bacillus, Marinilactibacillus, Staphyllococcus, and Novosphingobium genera from biofloc treatments were identified. In control group animals, strains of Bacillus and Exiguobacterium were isolated and identified. The genus Exiguobacterium was found common in all the different treatments and control. The result showed that shrimp grown on biofloc system allows colonizing more beneficial bacteria in gut than control. Few promising strains under Bacillus genus were found to produce all the extracellular enzymes along with antibiofilm activity.
      PubDate: 2019-12-01
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