Growth and stress of dourado cultivated in cages at different stocking densities

Braun, Neiva; Dafré, Alcir Luiz; Lima, Ronaldo Lima de; Beux, Luis Fernando; Brol, Fernanda Franciele; Nuñer, Alex Pires de Oliveira

doi:10.1590/s0100-204x2013000800050

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The lower AFCR of snapper at higher densities was most likely due to the effects of dominant fish, which cause subordinate fish such as sea bass to experience stress and decrease their feeding activity (Paspatis et al ). This supports the results of Braun et al () examining juvenile dourado, Salminus brasiliensis , cultivated in cages. In that study, the authors observed chronic stress with increasing stocking densities.…”

Section: Discussionsupporting

confidence: 92%

Effect of Density at Harvest on the Growth Performance and Profitability of Hatchery‐reared Spotted Rose Snapper, Lutjanus guttatus, Cultured in Floating Net Cages

Hernández

Martínez-Cordero

et al. 2016

J World Aquaculture Soc

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This study evaluated the effect of the density at harvest on the performance and profitability of hatchery‐reared spotted rose snapper cultured in cages. The fish were stocked at harvest densities of 15, 20, and 22 kg/m3 in cages of 222 and 286 m3. More than 39,000 snapper fingerlings with an initial weight of 14 g were stocked. The fish were fed an extruded diet and cultured over a 360 d period. The thermal growth coefficient ranged from 0.04 to 0.05 and survival was 95% for all treatments, with the highest final weight (436.8 g) observed for fish reared at a density of 20 kg/m3. The allometric value b indicated that hatchery‐raised, cage‐cultured snapper were heavier than their wild counterparts. The major costs were feed (ranging from 44.7–45.9%), labor (22.4–32.6%), and seed costs (20.2–26.1%). The total production cost ranged from US$ 6.5 to US$ 7.5/kg. The baseline scenario was not economically feasible. However, a 10% increase in the sales price resulted in increases in the internal rate of return (183%) and net present value (US$ 97,628.9). These results suggest that L. guttatus has the potential for commercial production in cages.

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Section: Discussionsupporting

confidence: 92%

Effect of Density at Harvest on the Growth Performance and Profitability of Hatchery‐reared Spotted Rose Snapper, Lutjanus guttatus, Cultured in Floating Net Cages

Hernández

Martínez-Cordero

et al. 2016

J World Aquaculture Soc

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“…Dourado, S. brasiliensis, inhabits Paraná, Paraguay and Uruguay rivers and the basins connected to the Patos Lagoon complex (Weingartner & Zaniboni-Filho, 2010). Braun et al (2013) stored Dourado at different densities (0.81 and 1.63 kg/m 3 ) in fish cages (1 m 3 ) in the Itá reservoir and found that the different densities did not influence growth. However, the stress parameters evaluated were considered high for the species.…”

Section: Regulations and Main Species Produced In Fish Cages In Brazilmentioning

confidence: 99%

Opportunities and challenges for fish culture in Brazilian reservoirs: a review

2018

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Aim Aquaculture plays an important role in the world and in Brazil. Artificial construction of water bodies, such as ponds and reservoirs, has allowed for fish culture in cages in those environments, generating conflicts over the use of these public waters. The producers are seeking to increase production, and the ecosystem is susceptible to the impacts caused by production activity. The aim of this review was to identify questions about these conflicts (productivity × environment) and to indicate possible solutions to the main problems related to fish farming in reservoirs. Methods A bibliographical survey was carried out on the main aspects of cage fish farming in Brazilian reservoirs. Studies from 1977 to 2018 (scientific journals, books, and thesis) were revised using seven databases, the CAPES periodicals portal and Google Scholar websites. The main keywords used were “aquaculture”, “reservoir”, “cage”, “eutrophication”, “carrying capacity”, “impacts”, “oligotrophic”, “escapes”, “hybrids”, and “pollution”. Results We accessed approximately 330 and cited 151 documents. Conclusions The negative aspects associated with cage fish farming, as escapes of cultivated fish, and the possible solutions of this and others negative impacts were addressed, identifying mechanisms for reducing conflicts between environmental impacts and aquaculture production. Potential solutions include the use of native fish species or sterile species, implementation of monitoring systems of the surrounding area, adoption of measures to reduce the accidental escape of fish, use of multitrophic culture systems, use of highly digestible diets with appropriate food management, and use of computer programs that incorporate current and historical environmental data to calculate carrying capacity and choose the most appropriate location for production.

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“…Considerando que, os parâmetros biométricos avaliados neste estudo não foram afetados pela dieta e as características inerentes desta secreção láctea, há indicativos para o uso desta fonte alimentar na alimentação de dourados juvenis. Apesar de existirem estudos utilizando o dourado nas diversas áreas da produção, como nutrição, comportamento, fisiologia e manejo, as pesquisas ainda são incipientes DAIRIKI;BRAGA et al, 2007;BRAUN et al, 2010BRAUN et al, , 2013. Com isso, as informações contidas neste trabalho podem ser de grande valia para a produção de dourados em sistema intensivo.…”

Section: Concentração De Proteína Total Dna E Rna Total Nos Tecidos unclassified

Desenvolvimento dos tecidos entérico, hepático e muscular de juvenis de pacu (Piaractus mesopotamicus, Holmberg 1887) e dourado (Salminus brasiliensis, Cuvier 1816) alimentados com dieta contendo colostro bovino liofilizado

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Enteric, liver and muscle tissues development of pacu (Piaractus mesopotamicus, Holmberg 1887) and dourado (Salminus brasiliensis, Cuvier 1816) juveniles fed diet containing lyophilized bovine colostrum The supply of lyophilized bovine colostrum (LBC), alternative protein source, has been evaluated as an innovative ingredient in fish nutrition. The milk secretion influence was studied on enteric, liver and muscle tissues development of pacu (Piaractus mesopotamicus) and dourado (Salminus brasiliensis), using analysis of serum IGF-I concentration, morphological structure study and enzyme activity in intestine, as well as the responses of cellular indicators in enteric, liver and muscle tissues. Juveniles of pacu (8.5 ± 0.7g; 7.7 ± 0.3cm) and dourado (13.3 ± 0.9g; 10.8 ± 0.3cm) were distributed in a completely randomized design in a factorial scheme 3x2, constituting of three diets with LBC inclusion (0, 10 or 20%) and two experimental periods (30 or 60 days). The performance indicators in pacu, interaction between diet and period was observed to weight gain (WG) and feed conversion rate (FCR) (P<0.05). GP values in 10 and 20% LBC did not differ from the values of 0% LBC, indicating that the diets were adequate and met the nutritional needs of the juveniles. Higher FCR was found with 10% LBC at 60 days. IGF-I concentration did not differ between diets in both species, but was higher in dourado at 60 days (P<0.05). The pacu and dourado intestinal epithelium histomorphometry, was not altered by the LBC supply, however, there were differences between intestinal segments. The enzyme activity of aminopeptidase N was higher in pacu fed 10% and 20% of LBC (P<0.05); the activity of peptidases and disaccharidases was lower at 60 days; except for aminopeptidase A which showed high activity in this period. In the dourado, was difference only to aminopeptidase A, which was lower at 60 days (P<0.05). Regarding the indicators of cellular activity, in intestine of pacu, total protein (TP)/RNA ratio was lower at 30 days. In liver of dourado, there was interaction between diet and period for DNA, being higher in fish fed 20% LBC, at 60 days. In muscle of pacu, TP/RNA was higher with 10% LBC; RNA, TP/DNA and RNA/DNA ratio lower at 60 d, while TP and DNA/RNA ratio increased during the same period. In muscle of dourado, RNA and RNA/DNA were lower at 60 days and, TP/RNA higher in the same period (P<0.05). Considering the aspects studied to evaluate the effects of bovine colostrum for juvenile pacu and dourado, it was observed that were kept unchanged the plasticity and enzymes activity in intestinal epithelium and cellular activity in enteric, liver and muscle tissues. This condition suggests the possibility of using this milk secretion in nutrition of fish studied.

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Growth and stress of dourado cultivated in cages at different stocking densities

Cited by 3 publications

References 7 publications

Effect of Density at Harvest on the Growth Performance and Profitability of Hatchery‐reared Spotted Rose Snapper, Lutjanus guttatus, Cultured in Floating Net Cages

Effect of Density at Harvest on the Growth Performance and Profitability of Hatchery‐reared Spotted Rose Snapper, Lutjanus guttatus, Cultured in Floating Net Cages

Opportunities and challenges for fish culture in Brazilian reservoirs: a review

Desenvolvimento dos tecidos entérico, hepático e muscular de juvenis de pacu (Piaractus mesopotamicus, Holmberg 1887) e dourado (Salminus brasiliensis, Cuvier 1816) alimentados com dieta contendo colostro bovino liofilizado

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