31 documents found, page 1 of 4

Environmental sustainability of Nile tilapia net-cage culture in a neotropical ...

Made available in DSpace on 2022-04-29T08:31:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-10-01; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The present study evaluated the environmental sustainability of Nile tilapia net-cage farms of differe...

Tambaqui growth reared in cages in a floodplain lake under different feeding rate

The objective of this work was to estimate the effect of feeding rates, 5%, 7.5% and 10% of body weight per day, on growth performance and metabolic parameters of tambaqui, Colossoma macropomum, reared in cages located in a floodplain lake. Fish fed at 5% of body weight per day presented better feed conversion; total plasma protein values, after 90 days, were significantly lower than in other treatments. A dail...

Tambaqui growth and survival when exposed to different photoperiods

Investigou-se o uso de diferentes fotos períodos (iluminação) durante o crescimento de juvenis de tambaqui (Colossoma macropomum) em cativeiro. As intensidades testadas foram: escuro contínuo (24hs sem luz), simulação do foto período natural (10hs de luz e 14hs sem luz) e iluminação contínua (24hs de luz). Não houve mortalidade nos diferentes tratamentos. Diferença significativa entre as médias do peso foi obse...

Crude protein levels for juvenile pirarucu

The objective of this work was to verify the effect of four protein levels on pirarucu, Arapaima gigas, growth performance. One hundred and twenty pirarucu juveniles, with an average weight of 120.6±3.5 g, were stocked into 12 floating cages with 1 m3 (ten fish per cage), in a complete randomized design with four treatments (32.7%, 39.3%, 43.4% and 48.6% crude protein), in three replicates each. After 45 days, ...

Influence of feeding period on consumption and weight gain of pirarucu

The objective of this study was to verify pirarucu Arapaima gigas preferential time of feeding, and the influence of different feeding periods on consumption and weight gain of this species. Three treatments were tested: diurnal feeding (fish fed at 9h and 15h), nocturnal feeding (fish fed at 21h and 3h), and continuous feeding (fish fed at 9h, 15h, 21h and 3h). Each treatment was evaluated in triplicate, and e...

Stocking density effect on growth homogeneity of juvenile pirarucu in confined ...

The objective of this work was to evaluate the stocking density over fish growth homogeneity of pirarucu (Arapaima gigas) juveniles in small volumes cages. Twelve 1 m3 net-cages were used in a 120 m2 earth pond consisting of three treatments (15, 20 and 25 fish/m3) with four repetitions each. Fish were stocked with an initial mean weight of 10.1±0.3 g and homogeneous distributed (p>0.05) between treatments. ...

Hematological responses as indicators of the pond culture of tambaqui, Colossom...

Assessment on the effect of salt and density on tambaqui fish transportation

The objectives of this study were to evaluate the efficiency of salt as a stress reductor and to determine the best transportation density for tambaqui (Colossoma macropomum) juveniles in customized plastic boxes. In the first experiment different concentrations of cooking salt (NaCl) in the water were tested, and in the second experiment the fishes were transported for three hours in 200 L plastic boxes using ...

Calcium fluxes in Hoplosternum littorale (tamoatá) exposed to different types o...

Fishes that live in the Amazonian environment may be exposed to several kinds of waters: "black waters", containing high dissolved organic carbon and acidic pH, "white waters", with ten fold higher Ca2+ concentrations than black waters and neutral pH, and "clear waters", with two fold higher Ca2+ concentrations than black waters and also neutral pH. Therefore, the aim of the present study was to analyze Ca2+ fl...

Níveis de proteína bruta na dieta de juvenis de matrinxã (Brycon amazonicus)