Inclusão de amido em dietas para larvas de tilápia-do-nilo

Abstract

RESUMO -O experimento foi realizado com o objetivo de avaliar a inclusão de amido em dietas para larvas de tilápia-do-nilo (Oreochromis niloticus). Foram utilizadas 375 larvas com 8,02 ± 2,11 mg de peso inicial, distribuídas em 25 aquários com capacidade unitária de 30 L, em um delineamento experimental inteiramente casualizado, com cinco tratamentos e cinco repetições. As rações foram formuladas para conter 0; 2,5; 5; 7,5 e 10% de amido, com 3.500 kcal ED/kg e 38,6% proteína digestível. Os peixes foram alimentados, à vontade, cinco vezes ao dia. O peso final, o ganho de peso, o fator de condição e a sobrevivência dos peixes alimentados com rações acrescidas de amido não diferiram em relação ao daqueles alimentados com a ração controle. O amido pode ser incluído como fonte energética em níveis de até 10% em rações para larvas de tilápia-do-nilo, pois não prejudica o desempenho dos peixes.Palavras-chave: desempenho, níveis de amido, Oreochromis niloticus, sobrevivência, tilápia Starch inclusion in the Nilo tilapia larvae dietABSTRACT -The experiment was carried out to evaluate the different levels of starch inclusion in Nile tilapia (Oreochromis niloticus) larvae diets. Three hundred and seventy-five larvae averaging initial weight of 8.02 ± 2.11 mg were allotted to 25 30 L-aquariums, as a completely experimental randomized design, with five treatments and five replications.The diets were formulated to contain the inclusion levels of 0: 2.5: 5: 7.5 and 10% of starch, with 3,500 kcal DE/kg and 38.6% digestible protein. The fishes were fed ad libitum, five times a day. No differences were observed on final weight, weight gain, condition factor and the fishes survival fed diets with starch and control treatment. Starch can be included up to 10% for Nile tilapia larvae as energy source, without effect on fish performance.

Performance and stress resistance of Nile tilapias fed different crude protein levels

“…The data from this study show that the levels of crude protein which provide the best performance and Re (Table 3) are close to those recommended by literature for this species larviculture, between 35 and 45% CP (El-Sayed & Kawanna, 2004;Meurer et al, 2005;Boscolo et al, 2008), with the ideal level of 41.3% (Hayashi et al, 2002).…”

“…Nile tilapia, contrary to several species which need live food, may be fed exclusively with formulated diet from the first feeding (Sanches & Hayashi, 1999;Toyama et al, 2000;Hayashi et al, 2002;Meurer et al, 2005;Boscolo et al, 2008), thus facilitating its larviculture.…”

Crude glycerol in diets for Nile tilapia sex reversal (Oreochromis niloticus, Linnaeus 1758)

“…Although Boscolo et al (2008) pointed to similar performance results for tilapia postlarvae feeding diets ranging from 0% to 10% starch, its presence in feed at an appropriate amount for this species and phase is important as a source of glucose. Thus, it avoids energy expenditure for glucose biosynthesis from glycerol or other precursors, as glycogenic amino acids or Krebs cycle intermediates (Lehninger, Nelson & Cox 1995).…”

“…Therefore, as glycerol was added, there was a decrease in the starch levels in the diet. Nile tilapia used starch efficiently compared to other fish species (Viola & Arieli ; Anderson, Jackson, Matty & Capper ; Degani & Revach ; Shiau ; Boscolo, Signor, Signor, Feiden & Reidel ). Meurer, Hayashi, Fornari, Bombardelli and Barbero () related positive linear result on Nile tilapia performance during sex reversal phase, when fish received diets with increasing starch levels (1.6–7.1%).…”

Elaboração de hambúrguer empanado de tilápia aplicando diferentes sistemas de coberturas comerciais

“…O filé resfriado ou congelado são as principais formas de comercialização, e rendem apenas 35 % do peso total do pescado. O restante, 65 %, são resíduos com alto valor proteico utilizados principalmente na produção de ração animal FEIDEN, 2007).…”