The influence of rearing density on stress response and disease susceptibility of ayu (Plecoglossus altivelis)

Iguchi, Kei’ichiro; Ogawa, K.; Nagae, Masaki; Ito, Fuminari

doi:10.1016/s0044-8486(02)00626-9

Cited by 164 publications

(104 citation statements)

References 23 publications

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“…Although not evaluated in this study, stress is always present in net cage farming. Stressors, such as high stocking densities, provoke a reduction in disease resistance under chronic stress (FIGUEIREDO;FARIA, 2005;IGUCHI et al, 2003;JOBLING, 1994). When assessing the effects of stocking densities on responses to stress, Lupatsch et al (2010) registered significantly higher levels of cortisol in fish kept at high densities.…”

Section: Resultsmentioning

confidence: 99%

“…Fish were anesthetized with 50 mg L -1 clove oil (INOUE et al, 2003), weighed and measured to estimate the growth parameters.…”

Section: Methodsmentioning

confidence: 99%

“…This species is appreciated in sport fishing for its aggressive behavior, shows good indices of growth for commercial production like weight gain and feed conversion, besides high quality meat (IZEL et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…An important step in the development of a technological package for the production of a fish species in captivity is to determine the optimum stocking density, which aims to provide greater productivity per area, optimizing the rates of survival, growth and profitability (BRANDÃO et al, 2004;CHATTOPADHYAY et al, 2013). A comparative analysis of profitability and high stocking density is required before selecting the best stocking density that can generate the highest production and profit for economic sustainability of net cage culture system (ISLAM et al, 2006;CONTE et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Commonly, at low stocking densities, fish have higher survival rates and good growth rate, however the production per area is low. On the other hand, fish kept at higher densities have lower growth, high levels of stress and social interactions, such as increased aggression (GOMES et al, 2000;IGUCHI et al, 2003). Even though cannibalism is most commonly found in the larval stage, this behavior can also be observed in the growing phase of Brycon species (MARQUES et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Stocking densities of juvenile Brycon orthotaenia: production parameters and economic benefits in net cages

Lago

Freitas

Pimenta

et al. 2014

Acta Sci. Anim. Sci.

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ABSTRACT. Developing a rearing technology requires the determination of the optimum stocking density. This study aimed to determine the best stocking density for Brycon orthotaenia juveniles grown in net cages, during the rearing phase. The research was conducted at the Experimental Farm of EPAMIG, in Felixlândia, Minas Gerais State, in the Três Marias Reservoir. 9,000 fingerlings were distributed into 12 net cages, 2 m 3 each, according to a completely randomized design with three replications and four different stocking densities (150, 300, 450, 600 fish m -3 ). Random samples were taken from each net cage, at the onset of the experiment and at 60 rearing days, to assess production parameters, specific growth rate and uniformity. We verified a positive linear relationship (p < 0.05) for final biomass (r 2 = 0.88), weight gain (r 2 = 0.87), productivity (r 2 = 0.86), apparent feed conversion (r 2 = 0.96) and economic viability (r 2 = 0.96). For survival (r 2 = 0.98), the relationship was negative (p < 0.05). There were no significant differences between treatments (p > 0.05) for growth parameters, uniformity and final weight. It can be concluded that the density of 300 fish m -3 is the most suitable, because it provides higher net revenue, survival, and a good feed conversion.Keywords: aquaculture, intensive system, survival, profitability, São Francisco river.Densidades de estocagem de juvenis de Brycon orthotaenia: parâmetros produtivos e benefícios econômicos em tanques-rede RESUMO. Para o desenvolvimento de uma tecnologia de cultivo é necessária a determinação da densidade de estocagem ideal. Objetivou-se determinar a melhor densidade de estocagem para juvenis de Brycon orthotaenia, cultivados em tanques-rede, durante a fase de recria. A pesquisa foi conduzida na Fazenda Experimental da Epamig, em Felixlândia, Estado de Minas Gerais, na represa de Três Marias. Foram utilizados 9.000 alevinos, distribuídos em 12 berçários com 2 m 3 em tanques-rede, seguindo o delineamento inteiramente casualizado, com três repetições e quatro diferentes densidades de estocagem (150, 300, 450, 600 peixes m -3 ). Amostras aleatórias de cada tanque-rede foram coletadas para as avaliações, no início do experimento e aos 60 dias de cultivo. Foram estimados os parâmetros produtivos, índice de crescimento específico e uniformidade. Obteve-se uma relação linear positiva (p < 0,05) para biomassa final (r 2 = 0,88), ganho de peso da biomassa (r 2 = 0,87), produtividade (r 2 = 0,86), conversão alimentar aparente (r 2 = 0,96) e para viabilidade econômica (r 2 = 0,96). Para sobrevivência (r 2 = 0,98), a relação linear foi negativa (p < 0,05). Não houve diferença significativa entre os tratamentos (p > 0,05) para os parâmetros de crescimento, uniformidade e peso final. Conclui-se que a densidade de 300 peixes m -3 é a mais indicada, pois, proporciona maior receita líquida, sobrevivência e boa conversão alimentar.Palavras-chave: aquicultura, sistema intensivo, sobrevivência, rentabilidade, rio São Francisco.

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Section: Resultsmentioning

confidence: 99%

“…Fish were anesthetized with 50 mg L -1 clove oil (INOUE et al, 2003), weighed and measured to estimate the growth parameters.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stocking densities of juvenile Brycon orthotaenia: production parameters and economic benefits in net cages

Lago

Freitas

Pimenta

et al. 2014

Acta Sci. Anim. Sci.

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Use of Medicinal Plants in Aquaculture

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Tapissier‐Bontemps

Sasal

et al. 2017

Diagnosis and Control of Diseases of Fish and Shellfish

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Plants have been reported to produce various effects such as antistress, growth promotion, appetite stimulation, immunostimulation, aphrodisiac and to have antipathogen properties in fish and shrimp aquaculture due to their varied active principles such as alkaloids, terpenoids, tannins, saponins and flavonoids. To date, most scientific studies on the use of medicinal plants in aquaculture have focused on identification of biological activity rather than natural product determination. The plant species that have displayed the highest potential for use in aquaculture are garlic (Allium sativum), pomegranate (Punica granatum), bermuda grass (Cynodon dactylon), Indian ginseng (Whitania somnifera) and ginger (Zingiber officinale). Algae are considered to be a rich source of original bioactive molecules which display multiple bioactivities. In aquaculture, several recent studies have showed the potential of algae for the treatment of pathogens or to improve fish fitness.

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Aquaculture as a tool to support goby‐fry fishery? Current knowledge on biology and ecology of the red‐tailed goby Sicyopterus lagocephalus

Pouil

Colsoul

2021

Aquaculture Fish & Fisheries

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Sicydiinae species are amphidromous gobies, adults spawn in freshwater, whereas free embryos undergo a pelagic open sea phase. Post-larvae or juveniles are caught for human consumption when entering in freshwater after their pelagic larvae life in seawater. Such goby-fry fisheries are existing since centuries and widespread in tropical areas over the world. There are uncertainties related to caught volumes and trends but, overall, go-fry fisheries are declining and their sustainability is questionable. Aquaculture is a potential tool in conservation and management of wild goby stocks. Among Sicydiinae species, the red-tailed goby Sicyopterus lagocephalus is the most spread and used as a model species in numerous works involving amphidromous fish. The aim of the study was to evaluate the potential in aquaculture of the red-tailed goby through the analysis of the literature available on this species. We found that this species has some assets to be a potential candidate for aquaculture such as a short production cycle and a high fecundity as well as potential high market values. Nevertheless, given the small size at hatching and the long pelagic larval life, larval rearing is likely to be a challenging rearing phase but appears to be feasible based on past experiences with other goby species. Throughout the paper, we provided recommendations for future research in red-tailed goby aquaculture.

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The influence of rearing density on stress response and disease susceptibility of ayu (Plecoglossus altivelis)

Cited by 164 publications

References 23 publications

<b>Stocking densities of juvenile <i>Brycon orthotaenia</i>: production parameters and economic benefits in net cages

<b>Stocking densities of juvenile <i>Brycon orthotaenia</i>: production parameters and economic benefits in net cages

Use of Medicinal Plants in Aquaculture

Aquaculture as a tool to support goby‐fry fishery? Current knowledge on biology and ecology of the red‐tailed goby Sicyopterus lagocephalus

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