Journal of Applied Aquaculture最新文献

{"title":"Comparison of EPA and DHA utilization in Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) fed two diets with different content of fish oil and rapeseed oil","authors":"G. Berge, Å. Krogdahl, Marie Hillestad, H. Holm, J. Holm, B. Ruyter","doi":"10.1080/10454438.2021.1955804","DOIUrl":"https://doi.org/10.1080/10454438.2021.1955804","url":null,"abstract":"ABSTRACT Atlantic salmon and rainbow trout with initial weights of 460–468 g were fed two diets either high in fish oil (FO) or rapeseed oil (RO) content. The abilities of the fish to metabolize and deposit lipid and n-3 fatty acids were compared. Growth rates, FCR, and fat digestibility were similar in both species. Rainbow trout showed higher condition factors and lower dress-out percentage and hepatosomatic index than salmon. Whole-body content of EPA and DHA were higher in both species fed the FO diet than in the RO diet, but indicated higher capacities to produce DHA in rainbow trout than in salmon. The total fat content in the RO group was lower and DHA higher in rainbow trout liver than in salmon, indicating a greater ability of rainbow trout to increase metabolism to DHA.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"167 - 185"},"PeriodicalIF":1.2,"publicationDate":"2021-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43305345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth performance, carcass composition, and digestive enzyme activity of Labeo fimbriatus in tanks provided with feed and periphyton substrate in two orientations","authors":"Gangadhar Barlaya, H. Umalatha, G. Hegde, Banahalli Sriramreddy Ananda Kumar, C. H. Raghavendra","doi":"10.1080/10454438.2021.1957054","DOIUrl":"https://doi.org/10.1080/10454438.2021.1957054","url":null,"abstract":"ABSTRACT The effect of substrate orientation on the growth of Labeo fimbriatus in periphyton-based culture system was evaluated through an on-farm growth trial conducted for 90 days in 4x4x1.2 m soil-based, fertilized out-door cement tanks. The treatments consisted of triplicate tanks receiving no feed (NF), receiving feed (F), and those receiving sugarcane bagasse as periphyton substrates vertically suspended in the water column (SV) or applied directly to the tank bottom (SB). Bagasse used at 2 t/ha was hung vertically in SV tanks, while it was spread at the tank bottom in SB. Fish in F treatment tanks were fed daily with a 25% crude protein diet. No significant effect of periphyton substrate on growth performance and production of L. fimbriatus was observed when compared with the group receiving feed. Survival was not affected by the treatments. Production did not vary between the substrate orientations. Carcass of fish in F, SV, and SB had similar proximate composition. Activity of gut digestive enzymes was higher in treatments with substrate as compared to no substrate treatments.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"273 - 284"},"PeriodicalIF":1.2,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1957054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49300183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Economic viability of a small scale low-cost aquaponic system in South Africa","authors":"A. Babatunde, R. Deborah, Moodley Gan, Taylor Simon","doi":"10.1080/10454438.2021.1958729","DOIUrl":"https://doi.org/10.1080/10454438.2021.1958729","url":null,"abstract":"ABSTRACT Aquaponics provides a sustainable means of converting aquaculture effluent to nutrients for growing plant. This unconventional, but synergistic system of food production has been documented to be economically feasible and sustainable, particularly in areas with limited land and water resources availability. This study assessed the economic feasibility of a low-cost small-scale aquaponics system using production output and economic data. Price trends, cost, revenue, return on investment (ROI), net present value (NPV) using a 10-year period, internal rate of return (IRR) and profitability analyses were modeled to determine the financial performance of the aquaponic system. The result indicated that this small-scale aquaponic operation is not economically viable (Gross profit: 42%, net profit: – 22%, ROI: – 8%, NPV: R81,466, IRR: 13% and Profitability Index: 0.35) by adopting conventional aquaponics cultural practice (fish: plant revenue model 59% to 41%) due to higher operating cost of producing a kg of fish (R55) vis-à-vis the market price, compared to plant production. A revenue model of 42% to 58% fish-to-plant ratio was marginally feasible (Gross profit: 59%, net profit: 13%, ROI: 7%, NPV: R92,445, IRR: 19% and Profitability Index: 0.50). A minimum revenue model of 30% to 70% fish-to-plant ratio by adopting optimized plant yield cultural techniques to attain economies of scale and viability, is suggested. This study serves as a model for promoting viable and sustainable unconventional food production system to attain food security and local economic development in South Africa.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"285 - 304"},"PeriodicalIF":1.2,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1958729","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48607599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth of Eastern oyster (Crassostrea virginica) using two oyster - bag float configurations","authors":"R. Haché, S. Plante, Sylvio Doiron","doi":"10.1080/10454438.2021.1955803","DOIUrl":"https://doi.org/10.1080/10454438.2021.1955803","url":null,"abstract":"ABSTRACT Two bag float configurations (on-side; on-top) for the culture of four length classes of Eastern oyster (Crassostrea virginica) were tested at two sites in Tracadie Bay, Canada. An interaction between the site and the float configurations was observed at the northern site for the 21–30, 31–45 and 46–65 mm oyster classes for their length, and in the 46–65 mm for width as well. The observed differences give a potential increase of 32.5% in growth on a 4-year cycle when on-top configuration is used. About 12.7% more market size oysters were produced in this configuration representing an increase of $9.24 (CAN) per bag. This study shows the potential benefit of the on-top configuration, but also the interaction between the site and the float configurations. Since the on-top configuration needs more maintenance time, it is suggested that the float configurations be chosen based on biofouling, growth variation, effect on oyster shape, and cost/advantage.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"201 - 212"},"PeriodicalIF":1.2,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1955803","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43710743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyzing factors affecting the technical efficiency of small-scale seaweed farms using a two-stage double bootstrap DEA approach","authors":"Marvin Louie G. Orbeta, L. Digal, Ivi Jaquelyn T. Astronomo, C. Q. Balgos, Shemaiah Gail P. Placencia, Melissa P. Loquias, Paolo Enrico Codog","doi":"10.1080/10454438.2021.1945520","DOIUrl":"https://doi.org/10.1080/10454438.2021.1945520","url":null,"abstract":"ABSTRACT Low productivity in seaweed farms in the Philippines is due to issues ranging from lack of training, weather damage, and prevalence of pest and diseases. This study sampled 63 small-scale seaweed farmers in Ipil, Zamboanga Sibugay, as part of a development project. Technical Efficiency (TE) scores were calculated using the two-stage double bootstrap Data Envelopment Analysis (DEA) approach to investigate the causes of inefficiencies and external factors affecting small-scale production. Bias-corrected TE scores reveal that input use can be reduced by 55% to produce the same level of output, suggesting significant efficiency gaps. Factors such as primary occupation, number of farms, access to credit, farm location, and type of product sold had significant effect on technical efficiency. Extending government loan facilities to include seaweed farmers can lead to a reduction in inefficiency. Government initiatives to encourage seaweed farming, choosing the right farm location, and providing information can positively impact efficiency.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"123 - 148"},"PeriodicalIF":1.2,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48137277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth performance, sex ratio, feed utilization, and survival of Oreochromis hybrids","authors":"Elysee Nzohabonayo, J. Kang’ombe, J. Manyala, D. Kassam","doi":"10.1080/10454438.2021.1943594","DOIUrl":"https://doi.org/10.1080/10454438.2021.1943594","url":null,"abstract":"ABSTRACT An experiment was conducted to evaluate the growth performance of hybrids from a diallel 3 × 3 crossing of Oreochromis karongae, O. shiranus, and O. mossambicus. Fingerlings of 3.47 ± 0.04 g were stocked at 5 fish m−2 in nine treatments replicated twice. Final weights were significantly different (P < 0.05) among treatments whereby hybrids from female O. karongae and male O. mossambicus registered higher values (48.48 ± 0.58 g) than other crosses. Hybrids from female O. karongae significantly (P < 0.05) performed well in terms of AFCR as they registered lower values (<2). The proportion of males varied between 65% and 90% in hybrids; survival ranged from 62.5% to 100%. Heterosis in hybrids from crosses with female O. karongae ranged from10.72 to 33.25. The results suggest that hybrids from crosses with female O. karongae may be suitable candidates for commercial fish farming as they have superiority of the most productive performance traits.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"112 - 122"},"PeriodicalIF":1.2,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43776619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of brewers spent grains with different levels of exogenous enzymes on the production performance and body composition of Nile tilapia (Oreochromis niloticus) and channel catfish (Ictalurus punctatus)","authors":"J. Tidwell, S. Coyle, W. Rossi, K. Rucker","doi":"10.1080/10454438.2021.1956669","DOIUrl":"https://doi.org/10.1080/10454438.2021.1956669","url":null,"abstract":"ABSTRACT This study evaluated Brewers Spent Grains (BSG) and an enzyme additive (AllzymeTM; ENZ) in practical diets for juvenile (~5 g/fish) Nile tilapia (Trial 1) and channel catfish (Trial 2). Following a factorial arrangement, effects of three dietary levels of BSG (0, 270, and 550 g/kg) and three levels of ENZ (0, 0.2, and 0.4 g/kg) on production performance and whole-body composition of the fish were evaluated. Upon conclusion of the feeding trials, no effects of ENZ, or interactions between BSG and ENZ, were found. Fish survival was >85% and unaffected by diet. Reduced growth of tilapia (from 949% to 778%) and catfish (from 1802% to 1364%) as dietary BSG increased from 0 to 550 g/kg were observed. In these trials, weight gain was reduced in both channel catfish and tilapia at BSG inclusion rates of ≥270 g/kg and that the addition of exogenous enzymes did not improve BSG utilization.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"257 - 272"},"PeriodicalIF":1.2,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1956669","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41501035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transport of killifish Hypsolebias flagellatus: effects of salt use and previous feeding in association with transport time","authors":"C. O. Paranhos, L. Neves, W. S. E. Silva, R. K. Luz","doi":"10.1080/10454438.2021.1943102","DOIUrl":"https://doi.org/10.1080/10454438.2021.1943102","url":null,"abstract":"ABSTRACT The aim of the study was to evaluate survival and water quality during the transport of Hypsolebias flagellatus using different concentrations of salt in water and different transport times in association with different previous diets. In experiment I, 40 males (1.38 ± 0.83 g) were used and the tested salinities were: 0 (control), 2, 4 and 6 g of salt/L. Dissolved oxygen was the highest in the concentration of 4 g of salt/L and lower in the control treatment (P <.05). In experiment II, 30 males fed (0.68 ± 0.27 g) with commercial diet and 30 males (1.48 ± 1.00 g) fed with artemia were transported during 12, 24 and 48 hours. The survival after transport was lower in 48 hours (P <.05). The water pH was higher in animals fed with diet (P <.05). The water temperature and water total ammonia increased with increasing transport time (P <.05). Dissolved oxygen decreases regardless of diet (P <.05).","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"100 - 111"},"PeriodicalIF":1.2,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1943102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43571810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of dietary oak (Quercus aegilops L.) acorn on growth performance, somatic indices, and hemato-biochemical responses of common carp, Cyprinus carpio L., at different stocking densities","authors":"M. Abdel‐Tawwab, N. Abdulrahman, V. M. Ahmad, D. O. Ramzi, B. Hassan","doi":"10.1080/10454438.2021.1902450","DOIUrl":"https://doi.org/10.1080/10454438.2021.1902450","url":null,"abstract":"ABSTRACT The present study was done to assess the effects of dietary oak (Quercus aegilops L.) acorn powder (OAP) on the growth performance, somatic indices, and hemato-biochemical responses of common carp, Cyprinus carpio L., reared at different stocking density conditions. For this purpose, fish (~55 g) were distributed into sixteen 70-L tanks at a density of 3 g/L (LSD) or 10 g/L (HSD) and fed diets supplemented with 0.0 (control) or 10 g OAP/kg for 6 weeks. The results showed significant increase in the performance of fish fed with the OAP additive at both stocking densities, but it was retarded at the control-HSD level. Fulton’s condition (K) factor as well as hepatic, gonads, and kidney somatic indices remained constant after the experimental period, but viscera and spleen somatic indices were significantly (P < 0.05) affected by dietary OAP and stocking density. The dietary OAP caused significant increases in counts of white blood cells and red blood cells as well as hemoglobin and hematocrit values in LSD conditions, while the control-HSD fish showed their lowest values. Additionally, the dietary OAP and stocking density were significantly modulated by the biochemical variables. In the control-HSD fish, higher glucose levels accompanied with lower levels of total protein, albumin, and globulin were observed. Fish reared under the control-HSD conditions showed highest levels of aspartate and alanine aminotransferases, creatinine, and uric acid, while their lowest values were recorded with the OAP-LSD fish. The control-HSD fish had highest levels of total cholesterol and triglycerides among the experimental groups. The dietary supplementation of OAP to the fish in HSD conditions induced significant (P < 0.05) decreases in total cholesterol and triglycerides than the control-HSD fish group, and their lowest levels were obtained at the OAP-LSD fish. Levels of low-density lipoprotein cholesterol (LDL) and high-density lipoprotein cholesterol (HDL) were significantly (P > 0.05) modulated by dietary OAP and stocking density. The highest level of LDL was recorded in the control fish at both densities, while the highest level of HDL was obtained in the control-LSD fish. The dietary supplementation of OAP enhanced the hemato-biochemical parameters of the control fish at HSD conditions to be similar to the control-LSD fish. In conclusion, a dietary level of 10 g OAP/kg diet was confirmed as a natural feed additive to improve aquaculture and welfare of common carp, especially under high stocking density conditions.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"34 1","pages":"877 - 893"},"PeriodicalIF":1.2,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1902450","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47962824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feeding frequency on Lophiosilurus alexandri: performance, hematology, and daily rhythms","authors":"Lucas Pedro Gonçalves Junior, Angélica da Silva Ferreira, I. F. Araujo Torres, W. Silva, L. S. Costa, J. López-Olmeda, N. C. Costa, P. A. Ribeiro, D. C. Costa, R. K. Luz","doi":"10.1080/10454438.2021.1944421","DOIUrl":"https://doi.org/10.1080/10454438.2021.1944421","url":null,"abstract":"ABSTRACT The aim of the present study was to evaluate the different feeding frequencies on the performance, hematology profile, daily rhythms of glucose and activities digestive enzymes for juvenile Lophiosilurus alexandri. Feeding frequency did not affect survival, final weight, daily weight gain (P > .05). Glucose showed a daily rhythmic variation, with the acrophase in the group F2 located at Zeitgeber Time (ZT) 12.51 h and at ZT 13.33 h in the group F5. The daily rhythms in digestive enzymes were also affected, especially chymotrypsin, whose activity was twofold higher in F5 than F2. Food ratio divided into a higher frequency along the day induces an increase in acid protease and chymotrypsin activities. Different feeding frequencies can influence hematology profile, daily rhythms of glucose and activities digestive enzymes. The production of juvenile L. alexandri can be successfully carried out adopting a feeding frequency of twice a day.","PeriodicalId":15031,"journal":{"name":"Journal of Applied Aquaculture","volume":"35 1","pages":"149 - 166"},"PeriodicalIF":1.2,"publicationDate":"2021-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/10454438.2021.1944421","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47240888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}