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Performance and Muscular Development of Nile Tilapia Larvae (Oreochromis niloticus) Fed Increasing Concentrations of Phenylalanine

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Agricultural Sciences 2016年第12期7卷 900-910页

作者： Diogo Yamashiro Dacley Hertes Neu Evandro Bilha Moro Evandro Bilha Moro Aldi Feiden Altevir Signor Wilson Rogério Boscolo Fábio Bittencourt cooperativa agroindustrial consolata Nova Aurora Brazil Faculdade de Ciências Agrarias-FCA Universidade Federal da Grande Dourados Dourados Brazil Centro de Engenharias e Ciências Exatas Universidade Estadual do Oeste do Paraná Toledo Brazil

Even though tilapia is of great economic interest, data on the nutritional requirements of amino acids during commercial breeding stages are scarce. So, the aim of this study was to analyse the performance and muscular growth of Nile tilapia larvae (Oreochromis niloticus) fed diets containing increasing concentrations of phenylalanine. The experiment took place at the Laboratory of Aquaculture of the Grupo de Estudos de Manejo na Aquicultura (GEMAq) of the Universidade Estadual do Oeste do Paraná (Unioeste), Toledo, PR, Brazil, for 30 days. A total of 450 larvae, with mean initial length of 1.5 ± 0.14 cm and mean initial weight of 0.04 ± 0.004 g, were randomly distributed into 6 treatment groups with 5 repetitions (30 tanks). Each experimental unit consisted of a 30 L tank containing 15 larvae. Six diets were formulated with increasing concentrations of phenylalanine (1.09, 1.24, 1.39, 1.54, 1.69 and 1.84%) and offered four times a day until apparent satiation. By the end of the experimental period, the following productivity indexes were analysed: length, weight, survival, weight gain, uniformity, feed conversion, specific growth rate and protein efficiency ratio. Three fish from each tank were collected for muscular growth analysis and the frequency of small ( 0.05) was observed in the productive performance parameters between the treatment groups. Thus, it can be concluded that the levels of phenylalanine contained in the experimental diets did not influence the performance of Nile tilapia larvae. However, there was more hyperplasia when we put 1.39% of phenylalanine in the diet.

关键词： Amino Acids Amino Acid Requirements Larval Fish Nutrition

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