Desempenho do tambaqui (Colossoma macropomum), de pira-pitinga (Piaractus brachypomum), e do híbrido tambatinga (C. macropomum x P. brachypomum) mantidos em viveiros fertilizados, na fase de engorda.
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2009-01-30
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Universidade Federal de Goiás
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This assessment was performed to evaluate the productive performance, body and fillet yield, chemical composition of the fillet and economic evaluation of tambaqui, pirapitinga and hybrid tambatinga kept in fertilized ponds. The present research was carried out at Setor de Piscicultura da Universidade Federal de Goiás, between January and October the 2008, which lasted 270 days. We used 300 tambaqui (Colossoma macropomum) fingerling, 300 pirapitinga (Piaractus brachypomum) fingerling, 300 hybrid tambatinga (female C. macropomum x male P. brachypomum), totalizing 900 fingerling randomly allotted in 12 fertilized ponds. The starter body weight of tambaqui, pirapitinga and hybrid tambatinga, were 6,16±0,34 g, 9,23±0,24 g and 8,93±0,33 g, respectively. The experimental design was composed by a completely randomized with three treatments (T1: tambaqui, T2: pirapitinga and T3: hybrid tambatinga) and four repetitions, totalizing 12 experimental units. The performance data were submitted to the analysis of co-variace, while the body and fillet yield and chemical composition of the fillet were subjected to analysis of variance and all means were compared by T tests (5%). The average survival rate (SR), body weight (BW), final biomass (FB), productivity (PROD), weight gain (WG), weight gain biomass (WGB), weight gain daily (WGD), protein efficiency rate (PER), weight whole fish (WWF), weight gutted fish (WGF), weight of fillet (WF), crude fillet protein (CP) and fillet ash were not significantly different. The tambaqui and pirapitinga had higher (p<0,05) feed intake (FI) in relation to the hybrid. The apparent feed conversion (AFC) of tambatinga was statistically lower than the pirapitinga but both averages were similar (p>0,05) to tambaqui. The specific growth rate (SGR) of tambaqui was higher (p<0,05) than the pirapitinga and hybrid. The tambatinga showed higher (p<0,05) percentage gutted fish (% GF) on pirapitinga, however, the tambaqui was similar (p>0,05) to both. The head percentage (%WH) of tambaqui and tambatinga were higher than pirapitinga (p<0,05). The fillet percentage (% WF) was better in pirapitinga followed by the hybrid and tambaqui (p<0,05). Hepato-somatic index (HIS) was higher in tambaqui and pirapitinga on tambatinga (p<0,05). The viscera-somatic fat index (VSFI) was higher (p<0,05) in pirapitinga on tambaqui and the hybrid. Moisture (MO) of fillet was significantly higher in tambatinga than tambaqui and pirapitinga. The ether extract of the fillet of tambaqui was higher (p <0.05) than the average of the hybrid tambatinga, and both were similar to pirapitinga. The production cost (PC) was higher in pirapitinga followed by tambaqui and hybrid (p<0,05), however, partial net revenue (PNR) was higher in tambaqui followed by pirapitinga and tambatinga. Considering the conditions proposed, it can be concluded that tambaqui was the specie that showed better performance, high yield of gutted fish and greater profitability. The pirapitinga presented the highest yield of fillet, suggesting greater added value to the processing.
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PAULA, Fernanda Gomes de. Performace of tambaqui (Colossoma macropomuma) pira-pitinga (Piaractus brachypomum) and hybrid tambatinga (C. macropomum x P. brachypomum) kept in ponds fertilized. 2009. 69 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2009.