Journal of The World Aquaculture Society最新文献

{"title":"Salinity/ionic balance interactions on the zootechnical performance and histology of Litopenaeus vannamei and water quality in a biofloc system","authors":"Mitsuaki Ueno Fukura,&nbsp;Luis Felipe Collazos Lasso,&nbsp;Luis Alejandro Vinatea Arana,&nbsp;Bernardo Baldisserotto","doi":"10.1111/jwas.13093","DOIUrl":"10.1111/jwas.13093","url":null,"abstract":"<p>This study aimed to evaluate the interactions between two low salinities (S = 4 and 8 g L⁻¹) and two ionic balances (Na⁺/Mg⁺²/Ca⁺²/K⁺ ratio, IB1 = 27.6/3.6/1.05/1 and IB2 = 40.6/4.7/1.98/1) on zootechnical performance and histology of <i>Litopenaeus vannamei</i> postlarvae (0.0073 ± 0.0007 g) and juveniles (0.2163 ± 0.0080 g) reared in a biofloc system at stocking density of 1500 and 300 individuals m⁻³, respectively, over two culture phases: nursery (30 days) and grow-out (60 days). High nitrification processes were detected at lower salinity treatments, with the lowest ammonia and nitrite concentration in those. There were no significant differences on shrimp survival between treatments; however, the best final weights were observed in the S8IB2 (0.24 ± 0.01 g) and S4IB1 (2.80 ± 0.12 g) treatments for the nursery and grow-out stages, respectively. The most frequent histological lesions were the absence of lipid vacuoles in the hepatopancreas and abundant organic debris in the gill lamellae. The viability of rearing <i>L. vannamei</i> juveniles in biofloc at low salinity is still relatively weak because of their low growth and low efficiency to store fatty acids in the hepatopancreas; however, higher postlarvae productivity was found at 8 g L⁻¹ and Na⁺/Mg⁺²/Ca⁺²/K⁺ ratio of 40.6/4.7/1.98/1 in the nursery stage.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Economic contribution of U.S. aquaculture farms","authors":"Ganesh Kumar,&nbsp;Shraddha Hegde,&nbsp;Jonathan van Senten,&nbsp;Carole Engle,&nbsp;Noah Boldt,&nbsp;Matthew Parker,&nbsp;Kwamena Quagrainie,&nbsp;Benedict Posadas,&nbsp;Frank Asche,&nbsp;Madan Dey,&nbsp;Suja Aarattuthodi,&nbsp;Luke A. Roy,&nbsp;Russell Grice,&nbsp;Quentin Fong,&nbsp;Michael Schwarz","doi":"10.1111/jwas.13091","DOIUrl":"10.1111/jwas.13091","url":null,"abstract":"<p>Economics is the study of the allocation of scarce resources to meet human wants and needs and has a critical role to play in addressing challenges related to environmental sustainability, community resilience, and food security. In the context of aquaculture, the key to such a discussion is understanding the linkages of aquaculture farming businesses with other economic sectors and how policy decisions that affect aquaculture result in economic ripples throughout local, regional, and national economies. The only previous national estimates of the economic contributions of U.S. aquaculture are nearly 30 years old. The current study was based on comprehensive data from detailed farm-level surveys (that captured 77% of the total value of U.S. aquaculture) supplemented by information from publications on the remaining aquaculture sectors. The economic contributions measured in this study were limited to those at the farm level and do not include subsequent impacts that occur as farmed products move through processing, distribution, food service, and retail sectors in the U.S. economy. Results showed that U.S. aquaculture farms contributed $4 billion annually and supported more than 22,000 jobs each year. Labor income and value-added contributions were $1 billion and $3 billion, respectively. Analysis of the linkages of U.S. aquaculture production activities with other economic sectors showed that nearly all (96%) economic sectors were supported to some degree by U.S. aquaculture farms. Foodfish farms generated the greatest contributions, followed by mollusk farms. Freshwater aquaculture farms contributed twice that of the contributions of marine aquaculture because of the greater size of the freshwater aquaculture sector. Growth of both freshwater and marine sectors would increase overall contributions to the economy. Constraints to growth of aquaculture include regulatory barriers that have restricted existing sectors from meeting current demand for their products. The lack of an adequate regulatory framework for offshore marine aquaculture has constrained its growth and development, especially with respect to the rest of the world. Streamlined regulations implemented in a more timely and efficient manner could result in substantially greater economic contributions from existing U.S. aquaculture farms. The total economic impact of U.S. aquaculture production is likely three to four times greater than the farm-level impacts estimated in this study as a result of impacts that occur as aquaculture products move downstream through various marketing channels. Additional research is needed to measure the impacts of U.S. aquaculture products in the processing, distribution, food service, supermarket, and restaurant levels of the marketing chain to fully capture the total economic contributions from U.S. aquaculture.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of a carbohydrase (xylanase and glucanase) enzyme complex in diets for Florida pompano Trachinotus carolinus","authors":"William Stites,&nbsp;Alexis Weldon,&nbsp;João Reis,&nbsp;Paulo Ito,&nbsp;Melanie Rhodes,&nbsp;D. Allen Davis","doi":"10.1111/jwas.13095","DOIUrl":"10.1111/jwas.13095","url":null,"abstract":"<p>Florida pompano, <i>Trachinotus carolinus</i>, can be fed soy-based, low-animal protein diets. However, anti-nutritional factors and carbohydrates limit digestibility. Dietary carbohydrase enzymes have been used to improve carbohydrate digestibility in several species and may be beneficial for Florida pompano. The present study was designed to evaluate the effects of using a carbohydrase enzyme complex (Natugrain® TS L, BASF Corporation, Ludwigshafen, Germany) composed of endo-1,4-ß-xylanase and endo-1,4-ß-glucanase (Xyl + Glu) on growth performance, feed utilization, and digestibility in diets fed to juvenile Florida pompano. A growth trial was conducted with iso-nitrogenous (40%) and iso-lipidic (8%) test diets containing 0, 0.015, 0.030, and 0.045% of Xyl + Glu. The trial was conducted in a recirculating system with 12, 1000-L tanks. Twenty fish (mean weight: 23.34 g ± 1.49 g) were stocked into each tank in a randomized design. Growth results indicated that there were no significant differences (<i>p</i> &gt; 0.05) in growth and feed conversion; however, thermal growth coefficient displayed significant differences (<i>p</i> = 0.0499) between the 0.015 and 0.030% inclusion. All enzymatic treatments displayed significant differences (<i>p</i> = 0.029) in apparent digestibility of crude protein compared with the basal diet. Results indicate that Xyl + Glu enzyme complex can impact protein digestibility but did not significantly affect growth performance.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141941390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tolerance of juvenile lumpfish (Cyclopterus Lumpus) to high rearing densities","authors":"Nathaniel N. Spada,&nbsp;Elizabeth A. Fairchild,&nbsp;Jesse T. Trushenski","doi":"10.1111/jwas.13089","DOIUrl":"10.1111/jwas.13089","url":null,"abstract":"<p>Lumpfish (<i>Cyclopterus lumpus</i>) are raised as cleaner fish for controlling sea lice. Intensive rearing is complicated by fin nipping that occurs between juvenile conspecifics. Lumpfish density-dependent interactions are not well understood; therefore, the effects of rearing density for different fish size classes warranted evaluation. Two size classes (2- and 13-g) of juvenile lumpfish were stocked at four different rearing densities (40, 60, 70, and 90 g/L) with growth, survival, and fish aggression assessed over 8 weeks. Mean weight gain and specific growth rates ranged from 170% to 307% and 1.77% to 2.50%, respectively, depending on density treatments, for the 2-g fish, and from 286% to 471% and 2.42% to 3.10% for the 13-g fish. Growth was negatively correlated with density, with faster growth linked to lower densities. No mortality occurred in any treatment and significant fish aggression only occurred among the larger lumpfish in the higher rearing densities. Based on these findings, growth of 2-g lumpfish can be increased if reared at 40 g/L or slowed at 70 g/L without impacting aggression. For grow out of 13-g fish to ~70 g with minimal aggression, a 40 g/L rearing density is recommended for faster growth and 60 g/L for slower growth.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of heat shock protein inducers in mitigating benzo[α]pyrene toxicity in stellate sturgeon fingerlings (Acipenser stellatus): Assessing the effects on CYP450 and AChE activity, HSP70 expression, antioxidant levels, cortisol, and immunological responses","authors":"Leila Vahdatiraad,&nbsp;Behrooz Heidari,&nbsp;Sevda Zarei,&nbsp;Tooraj Sohrabi,&nbsp;Hossein Ghafouri","doi":"10.1111/jwas.13092","DOIUrl":"10.1111/jwas.13092","url":null,"abstract":"<p>Benzo[α]pyrene (BαP), a polycyclic aromatic hydrocarbon (PAH), is a significant contaminant in the environment, which accumulates and is toxic to invertebrates and fish. The present study aimed to determine the acute toxicity of sublethal concentrations of BαP in the presence of the heat shock protein (HSP) inducer (HSPi) on CYP450 activity, HSP70 gene expression, antioxidant levels, immunological alterations, and AChE activity in stellate sturgeon fingerlings. Two-hundred and forty fish were exposed to 100 mg L⁻¹ of Nopal endurance (HSPi) for 4 h. In the next step, the fish were exposed to BαP concentrations equivalent to 25%, 50%, and 75% of the 96-h LC₅₀ values. Sampling was carried out on the first, third, and sixth days of the experiment, and the samples were analyzed using two-way analysis of variance (ANOVA), cluster analysis (CA), and principal component analysis (PCA). The CYP450 activity significantly increased under BαP treatments. Higher expression of the HSP70 gene was observed in the higher concentration of HSPi + BαP treatments. The lowest AChE activity was observed in BαP treatments. However, the activity of superoxide dismutase, catalase, and total antioxidant activity enzymes and immunological responses (lysozyme, IgM, and C3) increased by using HSPi. It can be concluded that the HSP inducer significantly decreased BαP toxicity and resulted in more resistance to stress situations in sturgeon fingerlings.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elevated water temperature in combination with an increase in daylength stimulate a synchronized onset of spermatogenesis in male Atlantic salmon (Salmo salar, L.) postsmolts","authors":"Enrique Pino-Martinez,&nbsp;Kari Anne Kamlund,&nbsp;Pablo Balseiro,&nbsp;Marianne Kraugerud,&nbsp;Albert Kjartan Dagbjartarson Imsland,&nbsp;Sigurd O. Handeland","doi":"10.1111/jwas.13090","DOIUrl":"10.1111/jwas.13090","url":null,"abstract":"<p>Male postsmolt maturation (“jacking”) is undesired in Atlantic salmon aquaculture due to economic and welfare impacts. Unfortunately, incidence of jacking has increased linked to intensive rearing conditions. This study subjected 1000 salmon (52.1 ± 5.2 g) to one of two temperatures (15, 12.5°C) and one of two photoperiods (constant light-LL, a 5-week LD12:12 winter signal regime-WS) to assess their effects on spermatogenesis regulation. Indicators included testis histology images, mRNA transcription of gonadotropin receptors for follicle-stimulating hormone (<i>fshr</i>) and luteinizing hormone (<i>lhr</i>), and of factors regulating spermatogenesis like anti-Müllerian hormone (<i>amh</i>), gonadal-soma-derived factors 1 and 2 (<i>gsdf1</i> and <i>gsdf2</i>), and insulin-like growth factor-3 (<i>igf3</i>). High temperature (15°C) induced early testis development processes irrespective of photoperiod, evidenced by presence of type B spermatogonia before clear increases in testis size or any transcriptional changes. The winter signal at 15°C caused a synchronized onset of spermatogenesis not present under constant light. This was evidenced by a pronounced downregulation of the spermatogenesis-inhibiting factor <i>amh</i> and a clear upregulation in the stimulating factor <i>igf3</i>. Consequently, combining high temperatures with winter signal regimes pose risk; high temperature can stimulate early cellular/endocrine processes of spermatogenesis, which can later be synchronized in the population by an increase in daylength.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Embryonic and early larval development of Florida pompano, Trachinotus carolinus","authors":"Ashley N. Morgan,&nbsp;Susan B. Fogelson,&nbsp;Paul S. Wills,&nbsp;Tracy Mincer,&nbsp;Sahar Mejri,&nbsp;Annie Page","doi":"10.1111/jwas.13077","DOIUrl":"10.1111/jwas.13077","url":null,"abstract":"<p>The Florida pompano, <i>Trachinotus carolinus</i>, is an ideal species for commercial aquaculture because of its rapid growth, tolerance to a range of environmental parameters, and high demand in the seafood market. This study detailed embryonic and early larval development of this species. Florida pompano followed similar developmental sequences to those observed in other marine teleosts, and embryos hatched between 22 and 28 h post-fertilization. Significant brain lobe differentiation occurred prior to hatching. Pectoral fins were functional within 1-day post-hatch (dph). Substantial eye development occurred within 3 dph, indicating visual acuity prior to the onset of exogenous live feeding. Intestinal segments were differentiated by 3 dph, and rotifers were seen in the digestive tract by 4 dph. Digestive functions were limited through the first 7 dph because of the absence of functional gastric glands and gastric mucous cells in the rudimentary stomach, lipid vacuoles in the anterior intestines, and the persistence of acidophilic supranuclear vesicles in the posterior intestines. Within 7 dph, the pharyngeal arches differentiated, and hematopoietic tissue and mesonephric tubules were visible in the larval kidney. Their rapid larval development and organogenesis are additional factors that make Florida pompano an ideal species for aquaculture production and should encourage continued efforts toward commercialization.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modulation of growth, immunity, and immune-antioxidant gene expression in Nile tilapia, Oreochromis niloticus, culture under biofloc system by dragon fruit, Hylocereus undatus, peel powder","authors":"Chinh Le Xuan,&nbsp;Vu Linh Nguyen,&nbsp;Supreya Wannavijit,&nbsp;Piyatida Outama,&nbsp;Nuttapon Khongdee,&nbsp;Nantaporn Sutthi,&nbsp;Viet Vuong Nguyen,&nbsp;Seyed Hossein Hoseinifar,&nbsp;Prapansak Srisapoome,&nbsp;Hien Van Doan","doi":"10.1111/jwas.13088","DOIUrl":"10.1111/jwas.13088","url":null,"abstract":"<p>This study examines the use of dragon fruit peel (DFP) powder as a dietary supplement on growth performance, immune responses, and gene expression of Nile tilapia, <i>Oreochromis niloticus</i>, cultured within biofloc systems. A total of 300 Nile tilapia fingerlings (14.64 ± 0.09 g) were subjected to five dietary treatments, with DFP added to a basal diet at doses of 0, 20, 40, 80, and 160 g kg⁻¹ DFP. Growth and immunological responses were assessed after 4 and 8 weeks of feeding, and the transcriptional level of immune and antioxidant-related genes was measured after 8 weeks. Fish fed diets containing DFP exhibited significantly greater weight gain, faster growth, and enhanced levels of key indicators of immunity than control fish (<i>p</i> &lt; 0.05). A diet containing 40 g DFP kg⁻¹ produced the best result in terms of growth, enhanced immune response indicators in skin mucus and blood serum, and the upregulation of <i>IL-1</i>, <i>IL-8</i>, <i>LBP</i>, <i>GPx</i>, <i>GST-α</i>, and <i>GSR</i> expression (<i>p</i> &lt; 0.05). Based on the quadratic regression analysis, the optimum concentration of DFP was 80 g kg⁻¹. These findings collectively suggest that powdered DFP may serve as a promising feed supplement for Nile tilapia raised in biofloc systems.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of strain and enteric septicemia of catfish vaccine-booster on production and processing traits of the Delta Select and Delta Control strains of channel catfish, Ictalurus punctatus","authors":"Brian Bosworth,&nbsp;Geoff Waldbieser,&nbsp;Dave Wise,&nbsp;Ganesh Kumar,&nbsp;Daniela Lourenco,&nbsp;Andre Garcia,&nbsp;Brian Ott,&nbsp;Les Torrans","doi":"10.1111/jwas.13068","DOIUrl":"10.1111/jwas.13068","url":null,"abstract":"<p>The Delta Select channel catfish strain (DS) was developed by selection for increased growth and carcass yield. Progeny from DS and the Delta Control (DC) strain (a randomly bred strain from the same base population as DS) were compared in three trials. Trial 1: unvaccinated ~1-year-old fingerlings from each strain reared communally in 0.4-ha ponds. Trial 2: vaccinated ~ 1-year-old fingerlings from each strain grown in separate replicated 0.4-ha ponds and fish in about half the ponds were given an ESC vaccine-booster at 13 months post-hatch. Trial 3: same procedures as Trial 2, except fish were raised in replicate 0.04-ha ponds with no vaccine-booster. In Trial 1 DS were larger at stocking, larger at harvest, and had higher carcass yield than DC; in Trial 2 DS were larger at harvest, had better survival and higher production/ha than DC. Vaccine-booster had no effect on fish growth or survival. DS and DC were not different for any traits in Trial 3. Although outcome varied among trials, the overall results indicated a vaccine booster did not affect growth or survival, DS strain fingerlings grew faster than DC fingerling, and DS had higher carcass yield than DC strain fish when reared communally.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationships between weight loss during short-term feed deprivation, feed conversion efficiency, and growth in Delta Select and Delta Control line channel catfish families","authors":"Brian G. Bosworth,&nbsp;Dakoda O. Chisolm,&nbsp;Michael J. Patterson,&nbsp;Brian D. Ott","doi":"10.1111/jwas.13072","DOIUrl":"10.1111/jwas.13072","url":null,"abstract":"<p>Weight loss during feed deprivation is correlated with feed conversion efficiency (FCR) in several fish species, suggesting weight loss could be used to indirectly select for improved feed conversion. Trials were conducted to determine relationships among weight loss and FCR with Delta Select and Delta Control line channel catfish fingerlings. Weight loss was measured for 79 Delta Select line families and 20 Delta Control line families in replicate feed deprivation trials. Weight loss was higher for Delta Controls than Delta Selects. The 10 Delta Select families with the highest weight loss, 10 Delta Select families with the lowest weight loss, and 10 random Delta Control families were used in a feeding trial. Initial weight, final weight, percent weight gain, and percent feed consumption were similar among Delta Select groups but higher than the Delta Control's. Feed conversion and survival were similar for all groups. Fish from the feeding trial were used in a third feed deprivation trial. Family means for weight loss were positively correlated across three feed deprivation trials but not correlated with feed conversion indicating selection for weight-loss would not improve feed conversion. The faster growth of Delta Select catfish is as a result of increased feed consumption.</p>","PeriodicalId":17284,"journal":{"name":"Journal of The World Aquaculture Society","volume":"55 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jwas.13072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}