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Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 22)
Achievements in the Life Sciences     Open Access   (Followers: 5)
ACS Synthetic Biology     Hybrid Journal   (Followers: 24)
Acta Biologica Colombiana     Open Access   (Followers: 7)
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Anadolu University Journal of Science and Technology : C Life Sciences and Biotechnology     Open Access  
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Annual Review of Cancer Biology     Full-text available via subscription   (Followers: 2)
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Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5)
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Applied Bionics and Biomechanics     Open Access   (Followers: 8)
Applied Vegetation Science     Full-text available via subscription   (Followers: 10)
Aquaculture Environment Interactions     Open Access   (Followers: 3)
Aquaculture International     Hybrid Journal   (Followers: 24)
Aquaculture Reports     Open Access   (Followers: 3)
Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society     Open Access   (Followers: 7)
Aquatic Biology     Open Access   (Followers: 5)
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Archiv für Molluskenkunde: International Journal of Malacology     Full-text available via subscription   (Followers: 3)
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Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arquivos do Museu Dinâmico Interdisciplinar     Open Access  
Arthropod Structure & Development     Hybrid Journal   (Followers: 2)
Arthropods     Open Access   (Followers: 1)
Artificial DNA: PNA & XNA     Hybrid Journal   (Followers: 3)
Asian Bioethics Review     Full-text available via subscription   (Followers: 3)
Asian Journal of Biodiversity     Open Access   (Followers: 4)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Cell Biology     Open Access   (Followers: 5)
Asian Journal of Developmental Biology     Open Access   (Followers: 2)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 4)
Asian Journal of Nematology     Open Access   (Followers: 4)
Asian Journal of Poultry Science     Open Access   (Followers: 4)
Atti della Accademia Peloritana dei Pericolanti - Classe di Scienze Medico-Biologiche     Open Access  
Australian Life Scientist     Full-text available via subscription   (Followers: 2)
Australian Mammalogy     Hybrid Journal   (Followers: 6)
Autophagy     Hybrid Journal   (Followers: 2)
Avian Biology Research     Full-text available via subscription   (Followers: 4)
Avian Conservation and Ecology     Open Access   (Followers: 11)
Bacteriology Journal     Open Access   (Followers: 1)
Bacteriophage     Full-text available via subscription   (Followers: 3)
Bangladesh Journal of Bioethics     Open Access  
Bangladesh Journal of Plant Taxonomy     Open Access  
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Batman Üniversitesi Yaşam Bilimleri Dergisi     Open Access  
Berita Biologi     Open Access   (Followers: 1)
Between the Species     Open Access   (Followers: 1)
Bio Tribune Magazine     Hybrid Journal  
BIO Web of Conferences     Open Access  
BIO-Complexity     Open Access  
Bio-Grafía. Escritos sobre la Biología y su enseñanza     Open Access  
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
BioCentury Innovations     Full-text available via subscription   (Followers: 1)
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Biodiversity: Research and Conservation     Open Access   (Followers: 26)
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 2)
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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: 6)
Biological Control     Hybrid Journal   (Followers: 4)
Biological Invasions     Hybrid Journal   (Followers: 20)
Biological Journal of the Linnean Society     Hybrid Journal   (Followers: 18)
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Biologicals     Full-text available via subscription   (Followers: 9)

        1 2 3 4 5 6 7 8 | Last

Journal Cover
Aquaculture International
Journal Prestige (SJR): 0.591
Citation Impact (citeScore): 2
Number of Followers: 24  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-143X - ISSN (Online) 0967-6120
Published by Springer-Verlag Homepage  [2350 journals]
  • Depth matters for bivalve culture in integrated multitrophic aquaculture
           (IMTA) and other polyculture strategies under non-eutrophic conditions
    • Authors: Carlos Sanz-Lazaro; Victoria Fernandez-Gonzalez; Pablo Arechavala-Lopez; David Izquierdo-Gomez; Elena Martinez-Garcia; Pablo Sanchez-Jerez
      Pages: 1161 - 1170
      Abstract: Abstract Bivalve cultivation, in single cultivation or in polyculture (including integrated multitrophic aquaculture; IMTA), is generally limited to eutrophic waters. We carried out a modeling study to test if, under meso- and oligotrophic conditions, depth could be a key factor for bivalve productivity associated to IMTA and other polyculture strategies. We applied the model Farm Aquaculture Resource Management (FARM) at three strata of the water column in two coastal fish farm areas in the Mediterranean Sea, using water column variables sampled seasonally to estimate the potential mussel production. According to FARM, mussel production was high in both areas and, in some cases, almost doubled when mussels were cultured below 25-m depth compared to shallower levels. Phytoplankton abundance is expected to notably influence mussel production compared to particulate organic matter. Thus, in meso- and oligotrophic stratified waters, where chlorophyll maximum is relatively deep, depth can be a key factor for the productivity of mussel cultivation. The obtained results could help to maximize the production of suspension-feeding bivalve cultivation and, therefore, the expansion and development of sustainable aquaculture in non-eutrophic marine waters.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0276-9
      Issue No: Vol. 26, No. 5 (2018)
  • Development of a simple and rapid monoclonal antibody-based flow through
           immunogold assay (FIA) for detection of Aeromonas hydrophila
    • Authors: Abhiman Purandara Ballyaya; Moumita Mondal; Shankar Mariappa Kalkuli; Suresh Babu Padinhate Purayil
      Pages: 1171 - 1186
      Abstract: Abstract In this study, we developed a simple, low-cost, and rapid flow through immunogold assay (FIA) for detection of Aeromonas hydrophila in fish tissues and validated. The developed assay relied on colloidal gold conjugated highly specific monoclonal antibody (B8E3) against 20 kDa protein of A. hydrophila. The assay can be completed within 5 min including antigen (sample) preparation and exhibited no cross-reaction with other major aquatic pathogens such as Vibrio anguillarum, V. parahaemolyticus, V. harveyi, white spot syndrome virus (WSSV), and Aphanomyces invadans. A wider range of Aeromonas species were tested including A. caviae, A. dhakensis, A. sobria, A. veronii, A. culicicola, A. sharmana, and A. schubertii and no cross-reactivity could be observed. The developed technique FIA could detect 103 CFU/ml of aeromonad cells. In addition, the FIA is as sensitive as the first-step polymerase chain reaction (PCR) and 1000 times sensitive than the immunodot blot method. The validation study revealed the accuracy of FIA by comparing with the standard first-step PCR. The proposed FIA is low-cost, easy-to-use, and compatible for field-level analysis of A. hydrophila in fish tissues. Our developed FIA could successfully detect A. hydrophila at early stage of the infection and could be easily availed by farmers, fish producers, non-technicians, and technicians in the aquaculture industry.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0278-7
      Issue No: Vol. 26, No. 5 (2018)
  • Economic evaluation of the commercial production between Brazilian
           samphire and whiteleg shrimp in an aquaponics system
    • Authors: Leonardo Castilho-Barros; Fábio H. Almeida; Marcelo B. Henriques; Walter Q. Seiffert
      Pages: 1187 - 1206
      Abstract: Abstract The implementation of aquaponics systems has significantly increased in the last two decades, and several studies have reported on the technical, socioeconomic, and environmental ramifications in order to achieve sustainability in food production. The present study, however, aimed to perform a commercial-scale economic evaluation, using a model marine aquaponics production system with the halophyte Sarcocornia ambigua and the shrimp Litopenaeus vannamei cultivated in nutrient film technology (NFT) and biofloc technology (BFT) systems, respectively. To calculate phytotechnical and zootechnical indexes, we used recent studies available in the literature. Indicators of operational costs (total cost of production—TCP) and financial viability were calculated based on a cash flow horizon of 10 years. The proposed study estimated an initial investment of US$ 474,253.07, with annual TCPs around US$ 192,220.50, US$ 247,740.52, and US$ 223,482.65 years 1, 2 to 9, and 10, the different periods studied. Within these respective periods, the annual production of halophyte was 17,017, 23,286, and 18,808 kg, while marine shrimp production was 10,659, 14,586, and 11,781 kg. Based on these annual production numbers, the TCPs were US$ 4.75, US$ 4.03, and US$ 4.67 kg−1 for halophyte and US$ 10.45, US$ 14.43, and US$ 11.52 kg−1 for shrimp. Three sales prices were estimated per kilogram of halophyte produced and one fixed price per kilogram of shrimp produced. Only the highest selling price showed favorable indexes after testing sensitivities. Based on the above parameters, halophyte TCP was below sales value, i.e., reference price, with the possibility of increasing the price to “premium” level, indicating that this marine aquaponics production system was feasible for implementation in Brazil.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0277-8
      Issue No: Vol. 26, No. 5 (2018)
  • J. Treasurer (editor): Cleaner fish biology and aquaculture applications
    • Authors: Malcolm Jobling
      Pages: 1207 - 1209
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0279-6
      Issue No: Vol. 26, No. 5 (2018)
  • Analysis of culture production and growth rate patterns of mussel (
           Mytilus galloprovincialis Lmk.) cultured in the open ocean of the SE Bay
           of Biscay for the commercial product development
    • Authors: K. Azpeitia; M. B. Urrutia; D. Mendiola
      Pages: 1211 - 1228
      Abstract: Abstract Mytilus galloprovincialis Lmk. mussels were cultured at two culture depths in a submerged longline system, located in the SE Bay of Biscay, from June 2013 to August 2014. The Von Bertalanffy Seasonal Growth Function (VBSGF) of the original seeded batch, without newly settled seed, at each culture depth was assessed. Mussels maintained their reached size during the slow growing months and size increased thereafter. In addition, to test both culture depth scenarios for resource management, the production of commercial pieces (“small” and “large” mussels) in quantity (mussel classification) was assessed. VBSGF output proved that commercial mussels may well be harvested throughout the year in the studied site. The culture period required to produce mussels of a commercial size was 1 to 1.5 years, depending on seeding date.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0275-x
      Issue No: Vol. 26, No. 5 (2018)
  • Fish meal replacement with squilla ( Oratosquilla nepa , Latreille) silage
           in a practical diet for the juvenile giant freshwater prawn, Macrobrachium
           rosenbergii de man, 1879
    • Authors: Valiyaparambil Mohanan Bijoy; Sarasan Sabu; Mahadevan Harikrishnan
      Pages: 1229 - 1245
      Abstract: Abstract Replacement of fish meal with squilla silage in practical diet for the juvenile giant freshwater prawn, Macrobrachium rosenbergii, was evaluated. Five iso-nitrogenous and iso-caloric diets were prepared in which protein requirements were met with 100% fish meal (control, diet 1) and squilla silage replacing fish meal at 25, 50, 75 and 100% (diets 2, 3, 4 and 5, respectively). Water stability and water absorption of five feeds revealed significant differences (P < 0.05). The weight gain varied between a maximum of 248.50 ± 34.07% in diet 4 to lowest 132.45 ± 14.34% in diet 1. The average daily gain in weight in grams varied from 0.091 ± 0.01 (diet 5) to 0.154 ± 0.04 (diet 3), whilst the specific growth rate and gross growth coefficient values were recorded highest in diet 4. Highest survival rates (86.66 ± 5.77%) were recorded in both experimental diets 4 and 5. Low feed conversion ratio of 1.19 ± 0.21 was recorded from diet 4, whilst the highest value of 2.16 ± 0.09% was estimated from the diet 5. Proximate carcass composition showed highest crude protein content in post-larvae fed with diet 5 (47.24%) in contrast to lowest diet 1 (36.12%). Lipid values fluctuated significantly between 2.45 and 7.18% (P < 0.05) between treatments. The ash content significantly increased from diet 1 (16.34%) to diet 5 (20.69%) (P < 0.05). Highest feed efficiency (gain/feed) value was recorded in diet 4 (1.52 ± 0.22), whilst the diet 5 showed lowest value (0.99 ± 0.06). The results suggested that squilla silage can be utilised up to 75% of the protein in prawn diets for fish meal replacement.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0280-0
      Issue No: Vol. 26, No. 5 (2018)
  • Effect of stocking density on growth performance, serum biochemical
           parameters, and muscle texture properties of genetically improved farm
           tilapia, Oreochromis niloticus
    • Authors: Fan Wu; Hua Wen; Juan Tian; Ming Jiang; Wei Liu; Changgeng Yang; Lijuan Yu; Xing Lu
      Pages: 1247 - 1259
      Abstract: Abstract The objective of this study was to assess the effects of stocking density on growth performance, serum biochemical parameters, and muscle texture properties of genetically improved farmed tilapia (Oreochromis niloticus, GIFT). Juvenile GIFT with an average initial weight of 12.54 ± 0.45 g (mean ± SD) were randomly stocked in 16 tanks (80 L) in a recirculation aquaculture system at four densities of 10 (D1), 20 (D2), 30 (D3), and 40 (D4) fish per tank for 56 days, with quadruplicate for each density. There were no significant differences in water temperature among the four treatments (P > 0.05). D4 had the significantly lowest dissolved oxygen content (5.52 vs 5.69–6.09 mg L−1) (P > 0.05) and pH (6.63 vs 6.87–7.20) (P < 0.05). NO2-N and NH4-N concentrations significantly increased with increasing stocking density (P < 0.05). Weight gain (WG) and specific growth rates (SGR) decreased with increasing stocking density. The lowest WG (617.20 vs 660.45–747.06%), SGR (3.52 vs 3.62–3.81% day−1), and highest feed conversion ratio (1.68 vs 1.53–1.58) were observed in D4. Fish at D4 had significantly lower condition factor (3.11 vs 3.29–3.37%) and survival rate (91.25 vs 97.50%) than those from D1 and D2 (P < 0.05). With increasing stocking density, serum total cholesterol, triglyceride, and total protein concentrations decreased (P < 0.05) and aspartate aminotransferase and alanine aminotransferase activities increased (P < 0.05). D4 fish had higher moisture content (78.80 vs 76.97%) and lower crude protein content (18.14 vs 19.39%) in muscle than D1 fish (P < 0.05). Compared to D1 and D2, D3 and D4 had lower muscle hardness (1271.54–1294.07 vs 1465.12–1485.65 g), springiness (0.62–0.65 vs 0.70–0.72), gumminess (857.33–885.32 vs 1058.82–1079.28 g), and chewiness (533.04–577.09 vs 757.53–775.69 g) (P < 0.05). High stocking density resulted in growth inhibition, declines in flesh quality, and disturbance to several serum biochemical parameters.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0281-z
      Issue No: Vol. 26, No. 5 (2018)
  • Microalga Isochrysis galbana in feed for Trachinotus ovatus : effect on
           growth performance and fatty acid composition of fish fillet and liver
    • Authors: Yongjin He; Gang Lin; Xiaozhen Rao; Langjun Chen; Huang Jian; Mingzi Wang; Zheng Guo; Bilian Chen
      Pages: 1261 - 1280
      Abstract: Abstract Seeking alternatives to the depleting fish oil are crucial for marine fish aquaculture, which is currently dependent on fish oil as the primary source of n-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFAs). Five isonitrogenous (46% crude protein) and isolipidic (16% crude lipid) feed diets (FO, ISO2.9, ISO4.8, ISO6.7, ISO8.6) were formulated by partially replacing fish oil with microalgae Isochrysis galbana. These diets were fed to triplicate tanks of Trachinotus ovatus (mean initial weight 1.92 g) for 80 days. This work demonstrates that a moderate inclusion (around 4.5–5.0 wt%, equivalent to the replacement of 24–26 wt% fish oil) of I. galbana biomass in fish diet improves fish growth performance, lipid deposition and enhances total n-3 fatty acids, DHA, and EPA contents in neutral and polar lipids (PLs) of fish muscle and liver of T. ovatus. The results disclosed in this study suggest that I. galbana microalgae represents a potential high-quality substitute for fish-based ingredients in aquaculture feeds, which can be a promising sustainable solution to resolve the depleting fish oil resource in a cost-effective manner.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0282-y
      Issue No: Vol. 26, No. 5 (2018)
  • Impact of food type on growth, survival and reproduction of the cyclopoid
           copepod Cyclopina kasignete as a potential live food in aquaculture
    • Authors: Nadiah W. Rasdi; Jian G. Qin
      Pages: 1281 - 1295
      Abstract: Abstract This study compared the efficacy of different dietary algae on the growth and reproduction of the cyclopoid copepod Cyclopina kasignete, a potential live food species for fish larvae in aquaculture. The experimental diets for the copepod consisted of three monoalgal diets (Nannochloropsis oculata, Tisochrysis lutea and dry Melosira sp.) and two mixed algae diets (T. lutea + N. oculata, T. lutea + dry Melosira sp.). The experiment was carried out for 30 days, and the population growth, survival and reproductive performance (generation time, hatching rate, life spawning times, daily offspring production, eggs per sac, lifespan and sex ratio) were used to assess the responses of C. kasignete to different food types. Population growth, survival and reproductive capacities of C. kasignete were significantly affected by the mono and binary species of algal diets. The results showed that copepods exhibited superior growth, survival and productivity when fed on fresh T. lutea, dry Melosira sp. and a mixture of both species compared to other dietary treatments. Copepods produced comparable growth, survival and productivity when fed on diatoms (dry Melosira sp.) as a single or in combination with other algae. This study indicates that cyclopoid copepod C. kasignete grow fast and have the potential to serve as a live food for aquaculture. The algae T. lutea, dry Melosira sp. and their combination are appropriate food to sustain the growth and reproduction of this copepods in mass culture as a potential live food in fish hatchery.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0283-x
      Issue No: Vol. 26, No. 5 (2018)
  • Influence of different microalgal diets on gonadal development of the
           carpet shell clam Ruditapes decussatus broodstock
    • Authors: Ahmed S. A. Abbas; Eman El-Wazzan; Amal R. Khafage; Abdel-Fattah M. El-Sayed; Fatma A. Abdel Razek
      Pages: 1297 - 1309
      Abstract: Abstract Studies considering broodstock conditioning of Ruditapes decussatus mostly used flagellates and diatoms for feeding, mainly Isochrysis galbana and Chaetoceros calcitrans, respectively. The present study evaluated the effect of different microalgal diets on gonadic maturation of R. decussatus including three microalgae species (C. calcitrans, Tetraselmis suecica, and Nannochloropsis oculata) which were used to prepare six diets: three monospecific and three bispecific mixed diets at a proportion of 1:1. Clams were daily fed at a ratio of 1% dry weight of algae/live weight of clam and unfed treatment was used as control. Results showed that clams fed C. calcitrans alone or mixed with T. suecica attained earlier full maturity with the highest response to spawning induction (after 34 conditioning days) and largest proportion in the partial spawning phase for both, followed by T. suecica alone after 48 days. In contrast, N. oculata alone or mixed diets demonstrated poor performance for gonadal maturation. Unfed treatment did not show any sign of maturation. The results indicated that T. suecica has high conditioning potential like C. calcitrans and their mixture gave the highest benefit. Therefore, T. suecica can be recommended for R. decussatus broodstock conditioning.
      PubDate: 2018-10-01
      DOI: 10.1007/s10499-018-0284-9
      Issue No: Vol. 26, No. 5 (2018)
  • Waste management in recirculating aquaculture system through bacteria
           dissimilation and plant assimilation
    • Authors: Zipporah Moraa Gichana; David Liti; Herwig Waidbacher; Werner Zollitsch; Silke Drexler; Joseph Waikibia
      Abstract: Abstract Wastewater management and disposal in aquaculture is becoming increasingly important due to stringent water regulations regarding waste discharges into natural water systems. Recirculation aquaculture is one of the technologies designed to reduce waste discharge through the nitrification process. However, nitrification results in nitrate accumulation which is normally reduced by dilution through water exchange. Water exchange is only possible with sufficient water. Although nitrification is a conventional process, it has limitations because the autotrophic bacteria require long start-up and multiplication periods. The nitrifiers require high levels of oxygen with relatively higher aeration costs. Moreover, the bacteria are sensitive to rapid changes in pH, temperature, and flow rate. Denitrification can be a solution to the limitations of nitrification since denitrifiers are most abundant in the natural environment and have higher growth rates than nitrifiers. In addition, the process reduces energy costs since there is no need for aeration, water consumption is also reduced drastically since water exchange is minimized. Organic loading can be reduced when fish waste is utilized as a carbon source. An alternative process to manage aquaculture wastes is through anaerobic ammonium oxidation (anammox), where ammonia and nitrite are converted into nitrogen gas. Anammox can efficiently reduce ammonia and nitrites from culture water, but it has not received wide application in aquaculture. Aquaculture wastewater contains nutrients which are essential for plant growth. The plants maintain good water quality by absorbing the dissolved nutrients. Denitrification, anammox, and nutrient uptake by plants are feasible strategies to reduce wastes from aquaculture effluents.
      PubDate: 2018-09-19
      DOI: 10.1007/s10499-018-0303-x
  • Effect of lignite fulvic acid on growth, antioxidant ability, and HSP70 of
           Pacific white shrimp, Litopenaeus vannamei
    • Authors: Yang Gao; Jingting Zhu; Huajiang Bao; Vector Hector; Bo Zhao; Zhangjie Chu
      Abstract: Abstract This study was conducted to evaluate the effects of fulvic acid (0, 0.3, 0.6, 0.9, and 1.2%) as feed additive on growth, feed utilization, antioxidant ability, and HSP70 in hemolymph and hepatopancreas of juvenile white shrimp Litopenaeus vannamei (average weight 2.5 g) reared under experiment conditions. Shrimp were stocked at a density of 625 shrimps m−3 for 60 days in net cages submerged in recirculating tanks. At the end of the experiment, specific growth rates and survival rates of shrimp in treatment groups fed with 0.6, 0.9, and 1.2% fulvic acid were higher compared to that of the control group. Shrimp fed 0.6, 0.9, and 1.2% fulvic acid had significantly lower feed conversion rates than those fed control diet. The optimum dietary fulvic acid requirement for juvenile shrimp based on weight gain was 0.897%. Furthermore, superoxide dismutase activity and peroxidase activity increased significantly, while malonaldehyde content decreased in the hemolymph and hepatopancreas of shrimp fed 0.9 and 1.2% dietary fulvic acid. Glutathione content increased obviously in hemolymph of shrimp fed 0.6, 0.9, and 1.2% fulvic acid. In hepatopancreas, glutathione content was significantly higher in shrimp supplemented with 1.2% fulvic acid. HSP70 decreased obviously in hemolymph of shrimp fed 0.9 and 1.2% fulvic acid, while shrimp fed with 0.6 and 0.9% fulvic acid showed lower HSP70 level in hepatopancreas. The results of this study demonstrated that dietary fulvic acid could improve survival rates, growth, feed utilization, antioxidant capability, and stress resistance of juvenile L. vannamei reared under intensive stocking conditions.
      PubDate: 2018-09-18
      DOI: 10.1007/s10499-018-0302-y
  • Evaluation of membrane filtration and UV irradiation to control bacterial
           loads in recirculation aquaculture systems
    • Authors: David Huyben; David Bevan; Roselynn Stevenson; Hongde Zhou; Richard Moccia
      Abstract: Abstract Ultraviolet (UV) irradiation is commonly used to control pathogen loads in recirculation aquaculture systems (RAS), although these micro-organisms can be shielded by particles in the water, and some species tolerate very high UV doses. The objective of this study was to evaluate membrane filtration (MF) as an alternative, or complimentary, treatment to UV irradiation for pathogen control in RAS, as well as examine the operation and cost of each treatment. In a pilot-scale RAS, both MF and UV were used to treat wastewater for 30 days and water samples were collected biweekly and analysed for culturable bacteria, suspended solids, UV transmittance and other parameters. Bacterial control efficiencies were similar between both MF and UV treatments, which removed 99% of total bacteria and 98% of heterotrophic bacteria, respectively. Surface fouling was negligible for the UV while MF required biweekly cleaning to maintain operation. However, MF had the additional benefit of removing 96% of suspended solids, which resulted in increased UV transmittance. Capital and operating costs of MF were similar to UV, but only when MF treated a fraction of the wastewater compared with UV. We conclude that MF represents a potential complimentary technology to enhance UV irradiation, especially to minimise pathogens in RAS that are shielded by particles or tolerate UV.
      PubDate: 2018-09-18
      DOI: 10.1007/s10499-018-0301-z
  • Optimizing metamorphosis in Paracentrotus lividus aquaculture using
           alternative macroalgae species to Corallina sp.
    • Authors: Marta Castilla-Gavilán; Vincent Turpin; Florence Buzin; Bruno Cognie; Priscilla Decottignies
      Abstract: Abstract Metamorphosis induction cues (by chemical mediation or direct contact) were tested in Paracentrotus lividus using three different macroalgae treatments: Corallina sp., Palmaria palmata, and Laminaria digitata. Higher percentages of metamorphosis were reached in Paracentrotus lividus larvae by direct contact with a Palmaria palmata substrate.
      PubDate: 2018-09-17
      DOI: 10.1007/s10499-018-0305-8
  • Photoautotrophic cultivation of oleaginous microalgae and co-pelletization
           with filamentous fungi for cost-effective harvesting process and improved
           lipid yield
    • Authors: Sirasit Srinuanpan; Benjamas Cheirsilp; Poonsuk Prasertsan; Yasuo Kato; Yasuhisa Asano
      Abstract: Abstract Oleaginous microalga Scenedesmus obliquus SIT06 was selected as potential biodiesel feedstocks due to its high lipid content and suitable fatty acid composition for production of biodiesel with high oxidative stability and high cetane number. The important factors for cultivating microalgae in photoautotrophic mode were optimized through response surface methodology (RSM). The highest microalgal biomass obtained was 1.99 ± 0.12 g L−1 with a high lipid content of 40.86 ± 0.32%. To simplify harvesting process of microalgal cells, pellet-forming filamentous fungi were inoculated into the late log-phase of microalgae culture. Among the fungi tested, Cunninghamella echinulata TPU 4652 most effectively harvested the microalgal cells with the highest flocculation efficiency of 92.7%. Moreover, the biomass and lipids of microalgae-fungi pellets were as high as 4.45 ± 0.06 and 1.21 ± 0.08 g L−1, respectively. The extracted lipids were mainly composed of C16:0, C18:0, and C18:1, and their estimated fuel properties meet with the international standards indicating their potential use as biodiesel feedstocks. This study has shown the strategies not only to simplify the harvesting process but also to increase the lipid yield and tailor the lipid composition.
      PubDate: 2018-09-13
      DOI: 10.1007/s10499-018-0300-0
  • Effects of dietary myo -inositol on growth, chemical composition and
           plasma chemistry of Amur sturgeon Acipenser schrenckii
    • Authors: Chang’an Wang; Hongbai Liu; Jinnan Li; Liansheng Wang; Zhigang Zhao; Liang Luo; Qiyou Xu
      Abstract: Abstract The present study was conducted to demonstrate the dietary myo-inositol requirement and its effects on the growth, proximate composition and blood chemistry of Amur sturgeon (Acipenser schrenckii). Triplicate groups of 30 fish (initial weight 11.90 ± 0.12 g) were fed different diets containing graded levels of myo-inositol (28.75, 127.83, 343.83, 565.81, 738.15 and 936.28 mg kg−1) until satiation for 56 days. The fish were weighed after a 24-h fast, and six fish were used for whole body composition analysis. Further, the liver and muscle were sampled from another six fish for lipid analysis. The blood and liver were sampled from the remaining six fish for haematology and fatty acid analysis. The weight gain of fish increased with myo-inositol content, from the 28.75- to 343.83-mg kg−1 myo-inositol treatment groups, and then stabilised. The liver lipid content and hepatosomatic index decreased significantly from 21.91 to 19.14% and from 3.20 to 2.76% with increased dietary myo-inositol supplementation, respectively. The whole body lipid content generally decreased from 6.33 to 5.55%. The content of liver-saturated fatty acids decreased significantly (28.13%) in the 936.28-mg kg−1 treatment group. The content of plasma non-esterified fatty acids increased with the increase in dietary myo-inositol supplementation from 0.77 to 1.17 mmol L−1, whereas the content of triglycerides significantly decreased from 4.62 to 3.28 mmol L−1. In conclusion, the optimum myo-inositol requirement was found to be 336.1 mg kg−1, based on weight gain in a two-slope quadratic broken-line model.
      PubDate: 2018-09-07
      DOI: 10.1007/s10499-018-0299-2
  • Assessment of artificial substrates for lumpfish: effect of material
           thickness and water current speed
    • Authors: Albert K. Imsland; Patrick Reynolds; Gerhard Eliassen; Thor A. Hangstad; Tor Anders Elvegård; Tonje Cecilie Urskog; Bjørn Mikalsen
      Abstract: Abstract This study assessed the use of different types of substrates (450 g PVC, 130 g plastic) and water speed (5.0, 10 and 20 cm s−1) on growth and substrate selection in lumpfish. There were no differences between the percentages of fish attached to both types of substrates as they grew for each of the three different water speeds. Substrate adherence was similar on both substrate types and for all water current speed as the study progressed and was between 25 to 30% in all groups at termination of the trial. Results from the present study show that increasing water speed did not affect attachment preferences in lumpfish as they grew. Larger specimens were observed attaching to both thin and thicker substrates equally. Water speed did not affect growth performance as there were no differences in growth observed at the end of the study period between the three groups of lumpfish. However, further studies are required to determine if higher water speeds affect both growth and attachment preference of lumpfish as they grow.
      PubDate: 2018-09-05
      DOI: 10.1007/s10499-018-0298-3
  • Effect of microencapsulated thyme essential oil on white spot
           virus-infected Litopenaeus vannamei
    • Authors: O. Tomazelli Júnior; F. Kuhn; P. J. Mendonça Padilha; C. Nunes Nesi; M. Mestres; J. Dal Magro; S. De Lamo Castellví
      Abstract: Abstract The present work was performed to investigate if feeding Litopenaeus vannamei with microencapsulated thyme essential oil (TEM, 1.05 g thyme essential oil per 100-g powder) adsorbed on commercial pellet feed was able to protect shrimps against white spot syndrome virus (WSSV) disease. Five treatments were tested: uninfected shrimp fed with commercial pelleted feed (TC, negative control), WSSV-infected shrimp fed with commercial pelleted feed (T1, positive control), WSSV-infected shrimp fed with commercial pelleted feed with 0.1% TEM (T2), WSSV-infected shrimp fed with commercial pelleted feed with 0.5% TEM (T3), and WSSV-infected shrimp fed with commercial pelleted feed with 1% TEM (T4). At 72 h post infection, phenoloxidase activity of shrimps treated with 1% TEM did not show significant differences with TC values but it was significantly higher than that of the other treatments (T1, T2, and T3). Moreover, shrimps treated with T4 presented absence of clinical signs of WSSV infection and their survival rate was significantly higher than that of T1, T2, and T3 treatments. Therefore, 1% TEM seemed to protect shrimps against WSSV symptoms. Using microencapsulated thyme essential oil may help to fight against WSSV in shrimp farms.
      PubDate: 2018-08-28
      DOI: 10.1007/s10499-018-0296-5
  • Comprehensive assessment of the genetic diversity and population structure
           of cultured populations of golden pompano, Trachinotus ovatus (Linnaeus,
           1758), by microsatellites
    • Authors: Liang Guo; Nan Zhang; Jing-Wen Yang; Hua-Yang Guo; Ke-Cheng Zhu; Bao-Suo Liu; Tian-Tian Liu; Dian-Chang Zhang
      Abstract: Abstract Golden pompano, Trachinotus ovatus, belongs to the family Carangidae. Within one decade, this species has rapidly become one of the most important cultured marine fish species in South China. However, the lack of a comprehensive genetic diversity assessment hinders the conservation of natural resources and management of cultured populations. Thus, we sampled one wild population and six cultured populations of golden pompano, which represented the whole cultured population, to assess the genetic diversity and population structure. The level of genetic diversity was low compared with those of other cultured fish, as the values of allelic richness, number of effective alleles and expected heterozygosity in the combined whole sample were 3.709, 2.592, and 0.591, respectively. These populations were little differentiated (Fst = 0.02091, p value = 0.00), and the whole sample did not show an explicit population structure at the individual level. The effective population size in each cultured population was small and in the whole sample was acceptable for a closed selection system. The pedigree reconstruction showed no evidence of artificial disturbance in mating. This general survey of cultured golden pompano populations showed the common characteristics of domestication with wild inputs. However, the low level of and potential decrease in genetic diversity should receive close attention in future breeding programs. In addition, we recommend wide surveys of natural resources and the establishment of closed breeding systems to increase genetic gain.
      PubDate: 2018-08-23
      DOI: 10.1007/s10499-018-0289-4
  • Ecosystem services of geoduck farming in South Puget Sound, USA: a
           modeling analysis
    • Authors: Alhambra Martínez Cubillo; João Gomes Ferreira; Christopher Michael Pearce; Robert Marshall; Dan Cheney; Bobbi Hudson
      Abstract: Abstract Provisioning and regulatory ecosystem services of Pacific geoduck clam (Panopea generosa) culture were simulated for an intertidal shellfish farm in Eld Inlet, South Puget Sound, Washington, USA. An individual geoduck clam growth model was developed, based on a well-established framework for modeling bivalve growth and environmental effects (AquaShell™). Geoduck growth performance was then validated and calibrated for the commercial farm. The individual model was incorporated into the Farm Aquaculture Resource Management (FARM) model to simulate the production cycle, economic performance, and environmental effects of intertidal geoduck culture. Both the individual and farm-scale models were implemented using object-oriented programming. The FARM model was then used to evaluate the test farm with respect to its role in reducing eutrophication symptoms, by applying the Assessment of Estuarine Trophic Status (ASSETS) model. Farm production of 17.3 t of clams per 5-year culture cycle is well reproduced by the model (14.4 t). At the current culture density of 21 ind m−2, geoduck farming at the Eld Inlet farm (area: 2684 m2) provides an annual ecosystem service corresponding to 45 Population-Equivalents (PEQ, i.e. loading from humans or equivalent loading from agriculture or industry) in top-down control of eutrophication symptoms. This represents a potential nutrient-credit trading value of over USD 1850 per year, which would add 1.48% to the annual profit (USD 124,900) from the clam sales (i.e. the provisioning service). A scaling exercise applied to the whole of Puget Sound estimated that cultured geoducks provide a significant ecosystem service, of the order of 11,462 PEQ per year (about USD 470,600) in removing primary symptoms of eutrophication, at the level of the whole water body. The modeling tools applied in this study can be used to address both the positive and negative externalities/impacts of shellfish aquaculture practices in the ecosystem and thus the trade-offs of the activity.
      PubDate: 2018-08-23
      DOI: 10.1007/s10499-018-0291-x
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