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  Subjects -> BIOLOGY (Total: 2999 journals)
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BIOLOGY (1425 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 20)
Achievements in the Life Sciences     Open Access   (Followers: 4)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Biologica Colombiana     Open Access   (Followers: 7)
Acta Biologica Hungarica     Full-text available via subscription   (Followers: 4)
Acta Biologica Sibirica     Open Access  
Acta Biomaterialia     Hybrid Journal   (Followers: 25)
Acta Biotheoretica     Hybrid Journal   (Followers: 5)
Acta Chiropterologica     Full-text available via subscription   (Followers: 6)
acta ethologica     Hybrid Journal   (Followers: 4)
Acta Limnologica Brasiliensia     Open Access   (Followers: 3)
Acta Médica Costarricense     Open Access   (Followers: 2)
Acta Musei Silesiae, Scientiae Naturales : The Journal of Silesian Museum in Opava     Open Access  
Acta Neurobiologiae Experimentalis     Open Access  
Acta Parasitologica     Hybrid Journal   (Followers: 9)
Acta Scientiarum. Biological Sciences     Open Access   (Followers: 2)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Actualidades Biológicas     Open Access   (Followers: 1)
Advanced Health Care Technologies     Open Access   (Followers: 4)
Advanced Studies in Biology     Open Access  
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Bioinformatics     Open Access   (Followers: 18)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4)
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 6)
Advances in Cell Biology     Open Access   (Followers: 24)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Ecological Research     Full-text available via subscription   (Followers: 41)
Advances in Environmental Sciences - International Journal of the Bioflux Society     Open Access   (Followers: 20)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in High Energy Physics     Open Access   (Followers: 19)
Advances in Human Biology     Open Access   (Followers: 1)
Advances in Life Science and Technology     Open Access   (Followers: 14)
Advances in Life Sciences     Open Access   (Followers: 4)
Advances in Marine Biology     Full-text available via subscription   (Followers: 15)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3)
Advances in Regenerative Biology     Open Access   (Followers: 1)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Virus Research     Full-text available via subscription   (Followers: 5)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 6)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 1)
Ageing Research Reviews     Hybrid Journal   (Followers: 8)
Aging Cell     Open Access   (Followers: 10)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
AJP Cell Physiology     Full-text available via subscription   (Followers: 13)
AJP Endocrinology and Metabolism     Full-text available via subscription   (Followers: 22)
AJP Lung Cellular and Molecular Physiology     Full-text available via subscription   (Followers: 3)
Al-Kauniyah : Jurnal Biologi     Open Access  
Alasbimn Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Biology Teacher     Full-text available via subscription   (Followers: 13)
American Fern Journal     Full-text available via subscription   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 10)
American Journal of Bioethics     Hybrid Journal   (Followers: 10)
American Journal of Biostatistics     Open Access   (Followers: 9)
American Journal of Human Biology     Hybrid Journal   (Followers: 12)
American Journal of Medical and Biological Research     Open Access   (Followers: 5)
American Journal of Plant Sciences     Open Access   (Followers: 19)
American Journal of Primatology     Hybrid Journal   (Followers: 15)
American Malacological Bulletin     Full-text available via subscription   (Followers: 3)
American Naturalist     Full-text available via subscription   (Followers: 68)
Amphibia-Reptilia     Hybrid Journal   (Followers: 6)
Anaerobe     Hybrid Journal   (Followers: 4)
Analytical Methods     Full-text available via subscription   (Followers: 9)
Anatomical Science International     Hybrid Journal   (Followers: 2)
Animal Cells and Systems     Hybrid Journal   (Followers: 4)
Annales de Limnologie - International Journal of Limnology     Hybrid Journal   (Followers: 1)
Annales françaises d'Oto-rhino-laryngologie et de Pathologie Cervico-faciale     Full-text available via subscription   (Followers: 3)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Biologia     Open Access   (Followers: 1)
Annals of Applied Biology     Hybrid Journal   (Followers: 7)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18)
Annals of Human Biology     Hybrid Journal   (Followers: 4)
Annual Review of Biomedical Engineering     Full-text available via subscription   (Followers: 17)
Annual Review of Biophysics     Full-text available via subscription   (Followers: 25)
Annual Review of Cancer Biology     Full-text available via subscription   (Followers: 1)
Annual Review of Cell and Developmental Biology     Full-text available via subscription   (Followers: 39)
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: 19)
Annual Review of Phytopathology     Full-text available via subscription   (Followers: 10)
Anthropological Review     Open Access   (Followers: 25)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antibiotics     Open Access   (Followers: 9)
Antioxidants     Open Access   (Followers: 4)
Antioxidants & Redox Signaling     Hybrid Journal   (Followers: 8)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apidologie     Hybrid Journal   (Followers: 4)
Apmis     Hybrid Journal   (Followers: 1)
APOPTOSIS     Hybrid Journal   (Followers: 8)
Applied Bionics and Biomechanics     Open Access   (Followers: 8)
Applied Vegetation Science     Full-text available via subscription   (Followers: 9)
Aquaculture Environment Interactions     Open Access   (Followers: 2)
Aquaculture International     Hybrid Journal   (Followers: 22)
Aquaculture Reports     Open Access   (Followers: 3)
Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society     Open Access   (Followers: 6)
Aquatic Biology     Open Access   (Followers: 5)
Aquatic Ecology     Hybrid Journal   (Followers: 30)
Aquatic Ecosystem Health & Management     Hybrid Journal   (Followers: 13)
Aquatic Science and Technology     Open Access   (Followers: 3)
Aquatic Toxicology     Hybrid Journal   (Followers: 18)
Archaea     Open Access   (Followers: 3)
Archiv für Molluskenkunde: International Journal of Malacology     Full-text available via subscription   (Followers: 3)
Archives of Biomedical Sciences     Open Access   (Followers: 7)
Archives of Microbiology     Hybrid Journal   (Followers: 8)
Archives of Natural History     Hybrid Journal   (Followers: 7)
Archives of Oral Biology     Hybrid Journal   (Followers: 2)
Archives of Virology     Hybrid Journal   (Followers: 5)
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arquivos do Museu Dinâmico Interdisciplinar     Open Access  
Arthropod Structure & Development     Hybrid Journal   (Followers: 2)
Arthropods     Open Access   (Followers: 1)
Artificial DNA: PNA & XNA     Hybrid Journal   (Followers: 2)
Artificial Photosynthesis     Open Access   (Followers: 1)
Asian Bioethics Review     Full-text available via subscription   (Followers: 1)
Asian Journal of Biodiversity     Open Access   (Followers: 5)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Cell Biology     Open Access   (Followers: 6)
Asian Journal of Developmental Biology     Open Access   (Followers: 2)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 2)
Asian Journal of Nematology     Open Access   (Followers: 3)
Asian Journal of Poultry Science     Open Access   (Followers: 4)
Australian Life Scientist     Full-text available via subscription   (Followers: 2)
Australian Mammalogy     Hybrid Journal   (Followers: 6)
Autophagy     Hybrid Journal   (Followers: 2)
Avian Biology Research     Full-text available via subscription   (Followers: 4)
Avian Conservation and Ecology     Open Access   (Followers: 12)
Bacteriology Journal     Open Access   (Followers: 2)
Bacteriophage     Full-text available via subscription   (Followers: 3)
Bangladesh Journal of Bioethics     Open Access  
Bangladesh Journal of Plant Taxonomy     Open Access  
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Berita Biologi     Open Access   (Followers: 1)
Between the Species     Open Access   (Followers: 1)
Bio Tribune Magazine     Hybrid Journal  
BIO Web of Conferences     Open Access  
BIO-Complexity     Open Access  
Bio-Grafía. Escritos sobre la Biología y su enseñanza     Open Access  
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
Biochemistry and Cell Biology     Hybrid Journal   (Followers: 14)
Biochimie     Hybrid Journal   (Followers: 7)
BioControl     Hybrid Journal   (Followers: 5)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 5)
Biodemography and Social Biology     Hybrid Journal   (Followers: 1)
Biodiversidad Colombia     Open Access  
Biodiversity : Research and Conservation     Open Access   (Followers: 26)
Biodiversity and Natural History     Open Access   (Followers: 5)
Biodiversity Data Journal     Open Access   (Followers: 3)
Biodiversity Informatics     Open Access  
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 2)
Bioelectromagnetics     Hybrid Journal   (Followers: 1)
Bioenergy Research     Hybrid Journal   (Followers: 2)
Bioengineering and Bioscience     Open Access   (Followers: 1)
BioEssays     Hybrid Journal   (Followers: 10)
Bioethics     Hybrid Journal   (Followers: 14)
BioéthiqueOnline     Open Access  
Biofabrication     Hybrid Journal   (Followers: 3)
Biogeosciences (BG)     Open Access   (Followers: 10)
Biogeosciences Discussions (BGD)     Open Access   (Followers: 1)
Bioinformatics     Hybrid Journal   (Followers: 308)
Bioinformatics and Biology Insights     Open Access   (Followers: 15)
Bioinspiration & Biomimetics     Hybrid Journal   (Followers: 6)
Biointerphases     Open Access   (Followers: 1)
Biojournal of Science and Technology     Open Access  
Biologia     Hybrid Journal  
Biologia on-line : Revista de divulgació de la Facultat de Biologia     Open Access  
Biological Bulletin     Partially Free   (Followers: 4)
Biological Control     Hybrid Journal   (Followers: 5)
Biological Invasions     Hybrid Journal   (Followers: 16)
Biological Journal of the Linnean Society     Hybrid Journal   (Followers: 16)
Biological Letters     Open Access   (Followers: 4)
Biological Procedures Online     Open Access  
Biological Psychiatry     Hybrid Journal   (Followers: 43)
Biological Psychology     Hybrid Journal   (Followers: 6)
Biological Research     Open Access  
Biological Rhythm Research     Hybrid Journal   (Followers: 2)
Biological Theory     Hybrid Journal   (Followers: 1)
Biological Trace Element Research     Hybrid Journal  
Biologicals     Full-text available via subscription   (Followers: 9)
Biologics: Targets & Therapy     Open Access   (Followers: 1)
Biologie Aujourd'hui     Full-text available via subscription  
Biologie in Unserer Zeit (Biuz)     Hybrid Journal   (Followers: 42)
Biologija     Open Access  
Biology     Open Access   (Followers: 5)
Biology and Philosophy     Hybrid Journal   (Followers: 16)
Biology Bulletin     Hybrid Journal   (Followers: 1)
Biology Bulletin Reviews     Hybrid Journal  
Biology Direct     Open Access   (Followers: 7)
Biology Letters     Full-text available via subscription   (Followers: 36)

        1 2 3 4 5 6 7 8 | Last

Journal Cover Aquaculture International
  [SJR: 0.613]   [H-I: 40]   [22 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1573-143X - ISSN (Online) 0967-6120
   Published by Springer-Verlag Homepage  [2353 journals]
  • Probiotic bacteria ( Lactobacillus plantarum ) expressing specific
           double-stranded RNA and its potential for controlling shrimp viral and
           bacterial diseases
    • Authors: Thitiporn Thammasorn; Sarocha Jitrakorn; Patai Charoonnart; Suwitchaya Sirimanakul; Triwit Rattanarojpong; Soraya Chaturongakul; Vanvimon Saksmerprome
      Pages: 1679 - 1692
      Abstract: Abstract We engineered probiotic bacteria, Lactobacillus plantarum, to produce specific double-stranded (ds)RNA for viral inhibition in penaeid shrimp. When supplemented in feed, the developed strain should offer specific viral disease resistance and still remain other beneficial effects on shrimp health against other bacterial pathogens. The pWH1520 expression vector was constructed to encode hairpin RNA targeting shrimp yellow head virus (YHV) in L. plantarum. The quantity of YHV-specific dsRNA (dsYHV) was approximately 1.66 ± 0.25 ng from 7 × 1011 CFU of L. plantarum. Feeding shrimp with the probiotic expressing dsYHV (at 1011 CFU g−1 feed) for 5 days prior to YHV challenge provided shrimp partial protection against YHV. In vitro agar well diffusion analysis revealed that both wild-type and transformed L. plantarum inhibited growth of Vibrio parahaemolyticus, the shrimp pathogen responsible for acute hepatopancreatic necrosis disease (AHPND) and early mortality syndrome (EMS). When tested in shrimp by immersion method, both L. plantarum strains (at 107 CFUs ml−1 seawater) also provided shrimp protection against V. parahaemolyticus. In conclusion, this study suggested the potential of the dsRNA-expressed L. plantarum for promoting shrimp health against the pathogenic virus. In addition, engineering L. plantarum for dsRNA production did not alter the probiotic’s intrinsic antibacterial property, and therefore, the developed strain can be used to protect shrimp against the important bacterial pathogen, V. parahaemolyticus causing AHPND/EMS.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0144-z
      Issue No: Vol. 25, No. 5 (2017)
       
  • Effect of protein solubility of soybean meal on growth, digestibility and
           nutrient utilization in Penaeus vannamei
    • Authors: Rajabdeen Jannathulla; Jagabattula Syama Dayal; Kondusamy Ambasankar; Hajah Imran Khan; Eda Purudhvi Madhubabu; Moturi Muralidhar
      Pages: 1693 - 1706
      Abstract: Abstract Soybean meal was subjected to autoclaving for different durations (0, 5, 10, 15, and 20 min) to alter its protein solubility index (PSI). As a result of autoclaving, the PSI of soybean meal was reduced from 85–64% but the protein quantity was not affected. Among amino acids, methionine and cystine were reduced significantly (P < 0.05) beyond autoclaving for 15 min. Trypsin inhibitor was below detectable level after 20 min of autoclave. Saponin and phytic acid were reduced by 0.3–8 and 1–24%, respectively, in treated soybean meal. Five iso-nitrogenous diets were formulated by replacing untreated soybean meal using processed soybean meal, and its effects on growth performance, feed efficiency, and digestibility parameters were assessed in Penaeus vannamei. The results revealed that the growth rate was not affected (P > 0.05) in shrimp fed with diets having soybean meal autoclaved up to 10 min (PSI 72%). The similar trend was noticed in feed efficiency parameters. The apparent dry matter and crude protein digestibility parameters were reduced (P < 0.05) in shrimp fed diets having soybean meal autoclaved for 15 and 20 min (PSI 68 and 64%). The inclusion of processed soybean meal has not influenced the shrimp carcass composition. The present study showed that though anti-nutritional factors were reduced in prolonged heat treatment, the declined protein solubility has resulted in the reduction of growth parameters and digestibility in those treatments. Hence, the present preliminary results suggest to scrutinize the quality of protein whenever heat is being applied during the processing of soybean meal and also other protein sources.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0147-9
      Issue No: Vol. 25, No. 5 (2017)
       
  • Characterization of novel EST-SNP markers and their association analysis
           with growth-related traits in the Pacific oyster Crassostrea gigas
    • Authors: Jiulong Wang; Qi Li
      Pages: 1707 - 1719
      Abstract: Abstract The Pacific oyster Crassostrea gigas is one of the most commercially important and worldwide cultured fishery animals. To facilitate marker-assisted selection in genetic improvement of this species, 108 novel polymorphic single-nucleotide polymorphism (SNP) markers were developed from expressed sequence tags (ESTs) by high-resolution melting analysis. The association between the markers and growth traits in a fast-growing strain and validation in two cultured populations was analyzed. For the 108 SNP loci, the observed heterozygosity varied from 0.011 to 0.625 and the expected heterozygosity varied from 0.031 to 0.501. By selective genotyping method, special allele frequencies of nine SNP markers showed significant difference between the fast-growing strain and the commercial control population (P < 0.0001). The nine SNP loci were further validated in extreme phenotype tails of the commercial control population and an independent cultured population. Three markers, jl027, ji090, and jl615, were found to be significantly associated with growth traits in oysters (P < 0.01). The proportion of additive genetive variance explained by the three confirmed SNPs ranged from 0.27 to 2.23%. The putative functions of the ESTs containing the jl090 and jl615 markers indicated that they might be related to growth of C. gigas. The three confirmed SNPs associated with growth traits would have potential applications in future genetic improvement of C. gigas.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0142-1
      Issue No: Vol. 25, No. 5 (2017)
       
  • Alteration of growth, intestinal Lactobacillus , selected immune and
           digestive enzyme activities in juvenile sea cucumber Apostichopus
           japonicus , fed dietary multiple probiotics
    • Authors: Ning Bao; Tongjun Ren; Yuzhe Han; Fuqiang Wang; Fei Chen; Zhiqiang Jiang
      Pages: 1721 - 1731
      Abstract: Abstract To assess the influences on growth performance, intestinal Lactobacillus, immune and digestive enzyme activities of juvenile sea cucumber Apostichopus japonicus by administrating multiple probiotics. Multiple probiotics (0, 6 × 107 and 9 × 107 CFU g−1) and normal basal feed were mixed thoroughly at different doses of diet (T0, T1, and T2, respectively) and were administered orally to sea cucumbers for 90 days. After the feeding trial, 20 sea cucumbers were randomly sampled from each pond. The results showed that administration of multiple probiotics significantly affected on the growth performance, non-specific immune enzymes, and microbial ecology of the gut of sea cucumbers (P < 0.05). However, the lysozyme activities, the counts of total, and lactic bacteria of sea cucumbers were not significantly altered at dose of 6 × 107 CFU g−1 feed compared with control group (T0). Protease activities of sea cucumbers were significantly increased when fed with T1 diet compared with T0 (P < 0.05). Under the conditions of mass-scale culture, the present results indicate that the multiple probiotics can benefit growth performance, innate immunity, microbial ecology of the gut, several digestive enzyme activities of sea cucumber. The present study confirmed the potential effects of the multiple probiotics as dietary probiotics in juvenile sea cucumber Apostichopus japonicus.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0148-8
      Issue No: Vol. 25, No. 5 (2017)
       
  • Nitrogen budget in integrated aquaculture systems with Nile tilapia and
           Amazon River prawn
    • Authors: Fernanda S. David; Danilo C. Proença; Wagner C. Valenti
      Pages: 1733 - 1746
      Abstract: Abstract The present work aims to describe the nitrogen (N) budget in integrated aquaculture systems with Nile tilapia (Oreochromis niloticus) and Amazon River prawn (Macrobrachium amazonicum) in earthen ponds, with and without the addition of different substrates. The experimental design was completely randomized, with three treatments (without a substrate, with a geotextile fabric substrate, and with a bamboo substrate) and four replications. Diet was the major input of N in the systems, ranging from ~65 to 71% and followed by inlet water (~26–31%). The portion retained in reared animals and periphyton ranged from ~21 to 25% (being ~21–24% in fish and prawns). The outputs that contributed most to the accumulation and release of N were, respectively, sediment (~24–38%) and N2 (~30–36%) emitted to the atmosphere. The addition of substrates did not improve the accumulation of nitrogen in the biomass of the target species. This suggests that the periphyton had a minor role on feed availability. In general, the systems were not efficient in using nitrogen since only ~22% of all available nitrogen was retained into prawn and tilapia biomass. On the other hand, the emission of N2 (an inert gas) to the atmosphere almost compensated the nitrogen supplied in the diet that was not assimilated by the reared animals and periphyton. In addition, data suggest that the integrated aquaculture in stagnant ponds may sequester substantial amounts of nitrogen from nutrient-rich aquatic environments and could be used as a mitigation tool.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0145-y
      Issue No: Vol. 25, No. 5 (2017)
       
  • Ovary development and annual egg production of hake, M. merluccius : a
           promising aquaculture species
    • Authors: Jim Treasurer
      Pages: 1747 - 1759
      Abstract: Abstract The full range of stages in ovarian development and fecundity of hake in the North Sea and the west coast of Scotland are described from histological examination of ovaries. Male hake from the North Sea had a gonadosomatic index of 0.88 in February compared with 3.30 in fish from west Scotland and 0.61 compared with 8.17 in females from respective locations, suggesting that the fish had still to mature in the North Sea. The maturation cycle of hake ovaries was described by a 7-point developmental scale after Rinchard and Kestemont (J Fish Biol 49:883–894, 1996). All developmental stages were present in hake from the North Sea and the west coast in February and stages 2 to 6 from the start of vitellogenesis to maturity in fish in west Scotland in May. This suggests that peak hake spawning occurred from February to May. The mean diameter of oocytes in previtellogenesis (developmental stage 1), the beginning (stage 2) and end (3) of endogenous vitelloegenesis, and exogenous vitellogenesis (4) was 34, 56, 105 and 249 μm, respectively, in histological material. Annual egg production was in the range 0.41 to 2.95 million for females of 962 to 3710 g, and the relationship to fish weight was described by y = 3985750.0005x , r 2 = 0.916.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0146-x
      Issue No: Vol. 25, No. 5 (2017)
       
  • Distribution of recombinant VP28 protein in tissues and its
           immunomodulatory effect against white spot syndrome virus in whiteleg
           shrimp, Litopenaeus vannamei (Boone, 1931)
    • Authors: G. Taju; N. Madan; S. Abdul Majeed; T. Rajkumar; M. A. Farook; S. Vimal; A. Nazeer Basha; A. S. Sahul Hameed
      Pages: 1761 - 1776
      Abstract: Abstract The gene encoding VP28 protein of WSSV was cloned into pRSET B vector, and recombinant VP28 (r-VP28) protein was produced in E. coli GJ1158 by induction with NaCl. The r-VP28 protein was purified. The purified r-VP28 protein was injected intramuscularly in Whiteleg shrimp, Litopenaeus vannamei, to study its tissue distribution at different time intervals by ELISA using the antiserum raised against r-VP28, and the results showed the presence of r-VP28 protein in different organs such as heart, hepatopancreas, gill, muscle, and hemolymph. The r-VP28 protein was cleared from all the organs after 264 h post-injection (hpi). Various immunological parameters such as phenoloxidase activity (PO), superoxide anion production, activity of superoxide dismutase, and MDA content were assessed in normal and experimentally r-VP28 protein injected shrimp at different time intervals. The mRNA expression of ten immune-related genes was analyzed in hemocytes, hepatopancreas, and gill by quantitative real-time PCR in order to investigate their expression to r-VP28 injection in L. vannamei, and the results showed the upregulation of expression of immune genes such as PO, cMnSOD, lipopolysaccharides (LPs), BGBP, hemocyanin, crustin, lectin, toll receptor, lysozyme, and tumor necrosis factor receptor-associated factor 6 (TRAF6) in VP28-injected shrimp. The efficacy study revealed that 86.67% survival was observed in shrimp orally treated with r-VP28 protein after WSSV challenge without any clinical sign of WSSV infection till the end of experimental period.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0155-9
      Issue No: Vol. 25, No. 5 (2017)
       
  • Growth and survival of cupped oysters ( Crassostrea gigas ) during nursery
           and pregrowing stages in open sea facilities using different stocking
           densities
    • Authors: Alessandra Roncarati; Alberto Felici; Gian Enrico Magi; Nina Bilandžić; Paolo Melotti
      Pages: 1777 - 1785
      Abstract: Abstract A pregrowing trial was carried out using nursery-stage cupped oyster (Crassostrea gigas) in order to evaluate weight, length, mortality, and final costs of spat grown in long-line aquaculture at different sampling times (t1–t5) over 81 days. Spat were reared at two stocking densities in polyvinyl chloride cylinders (10 cm diameter, 24 cm length) placed within lanterns composed of five levels (60 cm diameter, 11 cm height). Each lantern level hosted two cylinders. Lanterns were hung 6 m below the surface of the water in the Middle Adriatic Sea. A total of 53,100 spat (weight 0.033 g, length 5 mm) were divided into seven cylinders at either high density (H; 5055 oysters/cylinder, 167.3 g/cylinder) or low density (L; 2530 oysters/cylinder, 83.7 g/cylinder). On the basis of the ANOVA analysis, spat were significantly heavier (0.352 vs. 0.227 g; P < 0.001) and longer (12.22 vs. 10.47 mm; P < 0.001) in the L group compared to the H group. Considering the time factor, oysters were significantly heavier (0.941 g; P < 0.001) and longer (21.30 mm; P < 0.001) at t5 than at any previous sampling time (t1–t4). A higher rate of mortality was initially observed in the L group (6.7% at t1); however, mortality in the H group was higher at later sampling dates, reaching the highest level at t4 (32.4%). Spat grew better at the low stocking density, demonstrating that a higher stocking density is not suitable.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0152-z
      Issue No: Vol. 25, No. 5 (2017)
       
  • Diet supplemented with Grifola gargal mushroom enhances growth, lipid
           content, and nutrient retention of juvenile rainbow trout ( Oncorhynchus
           mykiss )
    • Authors: Mariano M. Pascual; Juan P. Hualde; Virginia A. Bianchi; Juan M. Castro; Carlos M. Luquet
      Pages: 1787 - 1797
      Abstract: Abstract This study examined the suitability of the edible mushroom Grifola gargal as a dietary supplement for juvenile rainbow trout (Oncorhynchus mykiss). Three treatments were established in triplicate using 50 fish (0.33 ± 0.01 g) held in 50-L containers. Treatments consisted of feeds (42–45% protein, ca. 18% lipid) supplemented with fruiting-bodies of G. gargal at 0 g kg−1 (control diet (CTRL)), 25 g kg−1 (GG25), or 100 g kg−1 (GG100). Fish were hand-fed to apparent satiation twice a day (except on Sundays) for 56 days. Feed intake and growth were recorded throughout the study, and fish body proximate composition and nutrient retention were assessed at the end of the trial. Fish given GG25 diet had better growth and feed utilization than those given the other feeds. Final body weight was 2.37 ± 0.04 g (CTRL), 4.07 ± 0.07 g (GG25), and 1.94 ± 0.06 g (GG100) and the thermal-unit growth coefficient increased significantly from 0.64 ± 0.01 in CTRL to 0.87 ± 0.01 in GG25. The feed efficiency and the protein efficiency ratio were best for fish fed GG25, and body lipid was 42.3 ± 2.6 g kg−1 in CTRL and 75.3 ± 1.5 g kg−1 in GG25 treatments. This coincided with a lower viscerosomatic index in the fish given GG25 than in those provided with the other feeds. These results suggest that dietary supplementation with G. gargal at 25 g kg−1 enhances growth and leads to improved feed utilization in small rainbow trout.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0154-x
      Issue No: Vol. 25, No. 5 (2017)
       
  • Fucus vesiculosus extract inhibits the proteolytic activity and gene
           expression of matrix metalloproteinases in Atlantic salmon ( Salmo salar
           L.)
    • Authors: Jonhard Eysturskarð; Sunnvør í Kongsstovu; Daisy Færø; Ása Jacobsen; Hóraldur Joensen
      Pages: 1813 - 1819
      Abstract: Abstract Fucoidans are sulfated fucose-rich polysaccharides found in macroalgae. Multiple biological functions have been attributed to fucoidans including inhibitory activity against matrix metalloproteinases (MMPs). A recent study showed that kidney and blood remains left in the abdominal cavity after gutting had a significant negative effect on gaping and fillet firmness in Atlantic salmon (Salmo salar L.). The authors hypothesized that one reason could be that MMPs from kidney and blood remains break down the connective tissue in Atlantic salmon fillets. The objectives of this study were to investigate the presence of MMPs in Atlantic salmon kidney and the inhibitory effect of a Fucus vesiculosus extract (FVE) on the proteolytic activity and gene expression of MMPs in Atlantic salmon. The inhibitory effect of FVE was compared to the inhibitory effect of the synthetic broad-spectrum MMP inhibitor marimastat. In this study, we found that FVE inhibits the proteolytic activity of MMP-1, MMP-2, MMP-9, and MMP-13 in Atlantic salmon kidney as well as MMP-2 gene expression in Atlantic salmon liver. Although the inhibitory effect of FVE on the proteolytic activity of MMPs is small compared to the inhibitory effect of marimastat, both FVE and marimastat inhibit 80% of the DQ-gelatin breakdown caused by Atlantic salmon kidney at a concentration of 0.1 mg mL−1. This indicates that FVE may also be capable of inhibiting other proteinases present in Atlantic salmon kidney. Overall, our findings suggest that FVE could be used in the fish processing industry to limit collagenase and gelatinase activity, thus reducing the connective tissue degradation in Atlantic salmon fillets.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0157-7
      Issue No: Vol. 25, No. 5 (2017)
       
  • Effects of feeding rates on growth, feed utilization, and body composition
           of juvenile Pseudobagrus ussuriensis
    • Authors: Xianyong Bu; Xuqiu Lian; Ying Zhang; Chenghui Yang; Cunhe Cui; Jianfang Che; Baibing Tang; Baohui Su; Qicun Zhou; Yuhong Yang
      Pages: 1821 - 1831
      Abstract: Abstract An 8-week feeding trial was conducted to investigate the effects of feeding rates on growth, feed utilization, and body composition of juvenile Pseudobagrus ussuriensis. Juvenile P. ussuriensis (initial body weight of 2.30 ± 0.01 g) were distributed into 15 tanks, and each tank was stocked with 30 fish. Satiation feeding (3.57% BW day−1) was determined by the point of cessation of voluntary feeding activity by fish. Five treatments that included triplicate groups were prepared for this study: 100% (satiation), 75, 50, and 25% of satiation groups and unfed group. The results indicated that weight gain (WG) and specific growth rate (SGR) increased with increasing feeding rates. WG and SGR of fish fed to satiation were significantly higher than that of fish fed to 50 and 25% of satiation and unfed fish (P < 0.05), but not significantly different from that of fish fed to 75% of satiation (P > 0.05). Feed efficiency (FE) and protein efficiency ratio (PER) of fish fed to 75% of satiation were significantly higher than that of fish fed other groups. There was a trend towards increased whole-body crude lipid and decreased whole-body moisture with increasing feeding rates, while whole-body protein content was not significantly affected by feeding rates. Condition factor and hepatosomatic index were increased with increasing feeding rates (P < 0.05), while there was no significant difference in viscerosomatic index with increasing feeding rates. Considering these experimental results, it can be concluded that the optimum feeding rate for growth of juvenile P. ussuriensis could be lowered to 75% of satiation without growth suppression.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0156-8
      Issue No: Vol. 25, No. 5 (2017)
       
  • High-resolution detection of bacterial profile of ocean water, before and
           after being used by shrimp farms
    • Authors: Marco A. Porchas-Cornejo; Marcel Martínez-Porchas; Francisco Vargas-Albores; Teresa Gollas-Galvan; Luis Rafael Martínez-Córdova; Roberto Vazquez-Euan; Emilio Peña-Messina
      Pages: 1833 - 1843
      Abstract: Abstract Bacterial diversity was evaluated in ocean water by next-generation sequencing (16S rRNA gene, V3/V4 regions) before and after being used by several shrimp farms with an operative capacity of >500 Ha and biomass producing of 3.5 t/Ha. A total of 22 bacteria species were identified in water before being incorporated into farm facilities; of these, Proteobacteria, Cyanobacteria, Bacteroidetes, and Actinobacteria resulted to be the most abundant phyla. After being used by shrimp farms, water decreased in quality (high concentrations of organic matter and nitrogenous metabolites) and the bacterial profile was modified in the outlet channel (effluent). Herein, beta diversity revealed changes in the bacterial profile of inlet and outlet water; for instance, different bacteria were detected de novo (some non-indigenous) and other were no longer detected; a total of 16 species (5 de novo) were registered in the effluent and Cyanobacteria, Actinobacteria, Proteobacteria, and Planctomycetes were the most abundant phyla. Many of the species thriving in the effluent resulted to be associated to the decomposition and recycling of organic matter and nitrogenous compounds. The farms acted as bioreactors favoring bacteria other than those detected in the inlet channel.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0160-z
      Issue No: Vol. 25, No. 5 (2017)
       
  • Nitric oxide euthanasia: a potential procedure for improving animal
           welfare and fillet color of tilapia ( Oreochromis niloticus )
    • Authors: Zi-Chao Wang; Mou-Ming Zhao; Zhongxiang Fang; De-Wei Chen
      Pages: 1845 - 1856
      Abstract: Abstract Tilapia (Oreochromis niloticus) were euthanized with saturated nitric oxide (NO) solution prior to slaughter. The behavior, heart rate, plasma cortisol, and color values were used to evaluate the welfare and fillet color of the fish. Tilapia were unconscious after 20 min of NO euthanasia which was much shorter than with carbon monoxide (CO) treatment. Tilapia remained quiet during the euthanasia process. The heart rate reduced from 41 to 7 beats/min after 20 min of NO euthanasia, and the cortisol level in the NO-euthanized fish plasma was significantly lower than that of the percussively stunned fish sample. Moreover, both the red and white muscles of NO-euthanized tilapia fillets had a brighter red color than those of control, and showed a significant increase in redness (a* values) postmortem at 0 °C for 15 days. The results suggested that NO euthanasia prior to slaughter is a good procedure to improve both the animal welfare and tilapia fillet color. In summary, NO treatment resulted in shorter euthanasia time, less stress, enhanced a* values, and stabilization of tilapia fillet red color. This procedure is valuable for aquaculture of tilapia and possibly other fish species.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0162-x
      Issue No: Vol. 25, No. 5 (2017)
       
  • Effects of dietary supplementation with red seaweed, Gracilaria pygmaea ,
           on growth, carcass composition and hematology of juvenile rainbow trout,
           Oncorhynchus mykiss
    • Authors: Ebrahim Sotoudeh; Marziyeh Jafari
      Pages: 1857 - 1867
      Abstract: Abstract A feeding trial was carried out to evaluate the effects of inclusion of 3 (GL3), 6 (GL6), 9 (GL9), and 12 (GL12) % red seaweed, Gracilaria pygmaea, in rainbow trout, Oncorhynchus mykiss, feeds. A feed without seaweed was used as the control. All feeds were formulated to be iso-nitrogenous (48% protein), iso-lipidic (16%), and iso-energetic (20 kJ g−1), and they were fed to triplicate groups of 30 rainbow trout (initial average body weight 0.26 g) for 7 weeks. At the end of the trial, the final weight (FW) was significantly higher in fish fed the GL6 feed (3.49 ± 0.03 g) than that in fish fed the control (3.23 ± 0.03 g) and GL12 (2.85 ± 0.02 g) feeds (P < 0.05), but did not differ significantly from fish given the GL9 feed (3.30 ± 0.05 g). Moreover, specific growth rate (SGR) was significantly lower in fish fed the GL12 diet than that in other groups (P < 0.05). Feed intake (FI) showed a progressive increase with increasing Gracilaria levels. Feed conversion ratio (FCR) decreased up to a Gracilaria inclusion level of 6% (1.08 to 0.88) and then increased (1.12 in GL12). Supplementation of the experimental diets with G. pygmaea did not affect whole body composition and hematological parameters of juvenile rainbow trout (P > 0.05). In conclusion, the findings suggest that a dietary supplement of circa 6% G. pygmaea may be useful to promote the growth of juvenile rainbow trout.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0158-6
      Issue No: Vol. 25, No. 5 (2017)
       
  • Effects of near-future-predicted ocean temperatures on early development
           and calcification of the queen conch Strombus gigas
    • Authors: Dalila Aldana Aranda; Nancy Brito Manzano
      Pages: 1869 - 1881
      Abstract: Abstract The queen conch, Strombus (Lobatus) gigas, is one of six species of conch distributed throughout the Caribbean of significant commercial importance. The Caribbean region is adversely impacted by climate change, which affects the marine ecosystems and the calcification process of organisms with calcareous structures, such as mollusks. We tested the influence of global warming predicted in 2100 on queen conch, Strombus gigas larval development, growth, survival rate, and calcification by exposing egg masses and larvae to increased temperatures (28, 28.5, 29, 29.5, and 30 °C) for 30 days. For analysis of calcification, imaging and chemical mapping (proportion, wt) were performed on 30-day-old larvae using a high-resolution scanning electron microscopy (HR-SEM) and X-ray photoelectron spectroscopy (XPS). A temperature of 30 °C resulted in the highest larval growth rate (mean ± SD 27.33 ± 2.96 μm day−1), significantly among treatments (p ≤ 0.05). Development was fastest at 30 °C, where the first larvae settled by day 27 (49%) and the mortality rate was 76%. At 28 °C, day 29 was the first day where settlement was observed for 20% of the larvae. There are significant differences among treatments on larval growth and development. The calcification process of S. gigas larvae was not affected by the experimental temperatures tested. Percent Ca content of shelled larvae showed no significant differences among treatments (mean ± SD 25.44 ± 4.74 and 24.99 ± 0.74% w for larvae grown at 30 and 28 °C, respectively).
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0153-y
      Issue No: Vol. 25, No. 5 (2017)
       
  • Genetic parameters for growth and survival traits in Litopenaeus vannamei
           at different ages
    • Authors: Jiachen Zhang; Fujun Cao; Jianyong Liu; Ruipeng Yuan
      Pages: 1901 - 1911
      Abstract: Abstract The aim of the current study was to estimate the genetic parameters for growth and survival tolerance traits in Litopenaeus vannamei at different ages (weeks 6, 10, 14, and 18). Sixty-five full-sib families (including 30 half-sib families) of L. vannamei, which were produced by 50 sires and 65 dams, were obtained by artificial insemination. There were a total of 6500 tagged shrimps representing 65 full-sib families evaluated for growth and survival traits in this study. The heritability estimates for growth traits were moderate to high (0.24 to 0.46), which suggested that selection for increasing growth traits were feasible, but the heritability of survival traits estimated on the observed scales were also low (0.01 to 0.06). The genetic correlations between growth traits (including body length and weight) within age were all positive and high, which ranged from 0.82 to 0.95 (P < 0.01). A significant correlation between growth traits showed that only selecting one growth trait for better growth and other correlated traits can be improved simultaneously. The genetic correlation between growth and survival traits within age were positive (0.02 to 0.05) at the early life stage and negative (−0.06 to −0.22) at later growth phase, which indicated that selecting for growth traits may not cause a positive correlated response in survival traits. Our results also showed that the uniformity ratio and correlation coefficient of families at adjacent growth stage increasing with age, which suggested that selection applied at early stage may result in only poor response and selection after week 14 can increase selection accuracy and accelerate the breeding process.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0163-9
      Issue No: Vol. 25, No. 5 (2017)
       
  • Growth performance, immune-physiological variables and disease resistance
           of common carp ( Cyprinus carpio ) orally subjected to different
           concentrations of Lactobacillus plantarum
    • Authors: Mehdi Soltani; Esmail Abdy; Mojtaba Alishahi; Ali Taheri Mirghaed; Pezhman Hosseini-Shekarabi
      Pages: 1913 - 1933
      Abstract: Abstract Nowadays, probiotics are among the most attractive food supplements for promoting animal’s growth and health condition with the aim of increasing production and lowering losses. Four hundred and eighty fish weighing 31.8 ± 2.6 g were randomly divided into four groups each in triplicates. Groups 1 to 3 were fed with commercial carp feed containing 0.7, 0.5, and 0.3 g (1.2 × 106, 0.9 × 106, and 0.56 × 106 cfu/g feed) probiotic Lactobacillus plantarum per kilogram feed for 80 days at 26 ± 1 °C, respectively. Group 4 received normal feed and was considered as control 1. Growth factors and some immunophysiological parameters were assessed on days 0, 20, 40, 60, and 80 of the trail. An overall increase in growth factors of probiotic-treated groups was seen, and final weight and condition factor of groups 1 and 2 were higher than control group (p ≤ 0.05). The highest specific growth rate and best feed conversion ratio were obtained in group 1. Red blood cell (RBC) count, hematocrit, and hemoglobin in probiotic groups were higher than control 1, but differences were significant for group 1 (p ≤ 0.05). White blood cell (WBC) count significantly increased in groups 1 and 2 compared to other groups (p < 0.05). Respiratory burst activity significantly increased in all probiotic fed groups with the highest level recorded in group 1 (p ≤ 0.05). Complement and lysozyme activities were significantly higher in group 1 followed by group 2 than both group 3 and control 1 (p ≤ 0.05). Also, serum bactericidal activity was significantly higher in group 1 than other groups (p ≤ 0.05). Serum total protein and immunoglobulin were higher in probiotic groups than control 1. No significant changes were seen in serum level of aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and lactate dehydrogenase (LDH) among all groups. After challenging fish with virulent strain of Aeromonas hydrophila, the lowest mortality was obtained in groups 1 and 2, respectively (p ≤ 0.05). These data clearly show that application of probiotic L. plantarum in carp feed can not only improve the growth variables and immunophysiological responses of fish but also increase the fish disease resistance to motile Aeromonas septicemia caused by Aeromonas hydrophila. However, these positive improvements are dose dependent.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0164-8
      Issue No: Vol. 25, No. 5 (2017)
       
  • Social, economic and production characteristics of freshwater prawn,
           Macrobrachium rosenbergii (De Man, 1879) culture in West Bengal, India
    • Authors: S. Ghosh; S. Manna; N. C. Sahu; A. Dutta; R. Goswami
      Pages: 1935 - 1957
      Abstract: Abstract Farming of giant freshwater prawn Macrobrachium rosenbergii, popularly known as ‘scampi,’ has recently been expanding in India. The present study was conducted using questionnaire survey, Participatory Rural Appraisal (PRA), key informant interviews, and focus group discussion and to assess the present state of production of giant river prawn (M. rosenbergii) in South 24 Parganas District of West Bengal, India. The socio-economic and technical survey on 80 prawn farmers was conducted during May, 2014–April, 2015. Prawn culture in ponds is slowly departing from the traditional endogenously managed system to a more extensive and commercial venture in the study areas. However, use of technology and scientific knowledge has not been adopted widely. In spite of operating within a semi-traditional system, this enterprise has shown moderate productivity and higher income in the study areas. Major constraints in the large-scale culture of prawn were adequate supply of seed at required quantities across locations, disease management, and social evils such as theft and poisoning of pond. Yield of prawn culture was affected by pond condition, family labor engagement in prawn culture, and resource endowment of the farm family. Linkage with formal financial institutions, subsidized input support from fishery department and investment in human resource development of farmers might be some point of intervention to boost prawn culture in the coastal zone of West Bengal, India.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0165-7
      Issue No: Vol. 25, No. 5 (2017)
       
  • The use of biofilm and different feeding rates in biofloc culture system:
           the effects in shrimp growth parameters
    • Authors: Gabriele Lara; Marcelo Honda; Luís Poersch; Wilson Wasielesky
      Pages: 1959 - 1970
      Abstract: Abstract This study evaluated the use of biofilm in a Litopenaeus vannamei biofloc system using different feeding rates. Shrimp juveniles (0.89 ± 0.35 g) were stocked at 300 shrimp m−3 in 24,150-L tanks. The feeding rates were calculated by considering an expected weekly growth of 1 g week−1 and an estimated weekly mortality of 0.5%. Each treatment corresponded to a different feeding rate, and each feeding rate corresponded to a fixed food conversion ratio. Thus, the treatments tested were as follows: T0 and T0+B (without addition of artificial food, with and without biofilm addition, respectively); T0.6 and T0.6+B; T1.2 and T1.2+B; and T1.8 and T1.8+B. The study lasted 42 days. At the end of the study, shrimp that were grown with no artificial food presented lower final weights and minor survival, independent of the addition of biofilm. The T1.2+B treatment did not differ significantly from the T1.2, T1.8, and T1.8+B treatments for the growth and feeding parameters. The survivals were higher than 91% in all of the feed treatments, and no significant differences were detected among these treatments. In contrast, the results allowed the conclusion that the presence of biofilm in the T1.2+B treatment represented a feed saving of 35% of the total amount of artificial food offered. This could represent a significant value in the cost of operation and may make the biofloc technology (BFT) system more cost-effective and environmentally friendly. The use of BFT in conjunction with biofilm can benefit shrimp farming by reducing the amount of feed supplied.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0151-0
      Issue No: Vol. 25, No. 5 (2017)
       
  • Effects of clam dredging on benthic ecology of two cultivated northern
           quahog beds with different harvest histories and sediment grain sizes
    • Authors: Renee Mercaldo-Allen; Shannon Meseck; Ronald Goldberg; Paul Clark; Catherine Kuropat; Julie M. Rose
      Pages: 1971 - 1985
      Abstract: Abstract In Connecticut, cultivation of the northern quahog, or hard clam, Mercenaria mercenaria L., relies on hydraulic dredging. After harvesting, leased shellfish beds remain fallow for varying durations to facilitate natural reseeding and to allow small clams to reach harvestable size. The interval between dredging events, or harvest history, may influence benthic ecology and response of communities to further dredging. Two clam beds with different harvest histories, located near Milford, Connecticut, were studied from July through October 2012. These leased beds, fallowed for 3 and 8 years, respectively, were subdivided into two plots. One plot on each bed was commercially harvested in July while the other remained not dredged. Sediment sampling was conducted on alternate weeks using Smith MacIntyre grabs and sediment cores to compare ecology of benthic communities and chemistry of marine sediments on newly dredged and not dredged plots within leases. Main effects of lease (harvest history), dredging treatment (dredged versus not dredged plots), mean sediment phi size (ɸ), and season (sampling date) significantly affected benthic community structure. Newly settled bivalves, including early successional pioneer species, occurred in high abundance on 3-year beds. Diversity, evenness, and number of species were high on the 8-year beds, while abundance of individuals was low, more typical of later successional equilibrium communities. Differences among a subset of species on the 8-year beds were observed between dredged and not dredged plots while no community differences were observed between dredging treatments on 3-year beds. Significantly more individuals were observed on dredged versus not dredged plots on the 8-year beds only. Our results suggest that harvest frequency and/or sediment ɸ size may explain differences in benthic assemblages between leased areas with different dredging histories, while dredging had no measurable effect on sediment chemistry.
      PubDate: 2017-10-01
      DOI: 10.1007/s10499-017-0167-5
      Issue No: Vol. 25, No. 5 (2017)
       
 
 
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