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Crude protein levels for juvenile pirarucu
Ituassú, Daniel Rabello; Pereira Filho, Manoel; Roubach, Rodrigo; Crescêncio, Roger; Cavero, Bruno Adan Sagratzki; Gandra, André LimaThe 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
Crescêncio, Roger; Ituassú, Daniel Rabello; Roubach, Rodrigo; Pereira Filho, Manoel; Cavero, Bruno Adan Sagratzki; Gandra, André LimaThe 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 ...
Cavero, Bruno Adan Sagratzki; Pereira Filho, Manoel; Roubach, Rodrigo; Ituassú, Daniel Rabello; Gandra, André Lima; Crescêncio, RogerThe 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. ...
Sustainable biomass of pirarucu juveniles in small volume net cages
Cavero, Bruno Adan Sagratzki; Pereira Filho, Manoel; Roubach, Rodrigo; Ituassú, Daniel Rabello; Gandra, André Lima; Crescêndo, RogerThe objective of this work was to estimate the sustainable biomass of pirarucu Arapaima gigas (Cuvier, 1829) juveniles kept in small volume net cages. During 200 days four 1-m3 net cages were stocked with 21 fish/cage and had an initial total biomass of 0.84±0.14 kg (21 fish/cage). The net cages were placed in a 50-m2 pond with constant water flow. Conditioning factor, feed conversion, specific growth rate and ...
Use of live food as starter diet in feed training juvenile pirarucu
Cavero, Bruno Adan Sagratzki; Ituassú, Daniel Rabello; Pereira Filho, Manoel; Roubach, Rodrigo; Bordinhon, André MoreiraIn this trial, two different live foods were tested as starter diet in the feed training of juvenile pirarucu, Arapaima gigas. Two treatments were used, Artemia sp. and a mixture of native zooplankton. Weight gain, percentage of feeders and survival did not show any difference between treatments (p>0.05). Live food is efficient as starter diet to train juvenile pirarucu to accept dry feed.
Tolerance of pirarucu juveniles to increasing ammonia concentration in a closed...
Cavero, Bruno Adan Sagratzki; Pereira Filho, Manoel; Bordinhon, André Moreira; Fonseca, Flávio Augusto Leão da; Ituassú, Daniel RabelloThe objective of this work was to evaluate the tolerance of pirarucu (Arapaima gigas) juveniles to increasing concentrations of ammonia in the water. Eight fish (2.6±0.4 kg and 70.5±4.1 cm length) were evenly distributed in four tanks (0.8x0.9x2.6 m) with 410 L of water buffered with Na2PO4 (0.1 M) and HCl (0.1 M), where they were kept for 33 days. Ammonia concentrations in the fish blood plasma and in the wate...
Growth of tambaqui submitted to different feed deprivation periods
Ituassú, Daniel Rabello; dos Santos, Gin Robson; Roubach, Rodrigo; Pereira Filho, ManoelThe objective of this study was to evaluate the effect of feed deprivation on juvenile tambaqui (Colossoma macropomum) growth parameters and body composition. In a complete randomized design, one hundred and eighty fishes, weighting 75.68±8.62 g were maintained in twelve 180-L tanks and submitted to four feed deprivation periods (0, 14, 21 and 28 days). Average fish weight at the end of feed deprivation period ...