INFLUENCE OF AHEMERAL PHOTOPERIOD ON BROMATOLOGICAL CHARACTERISTICS OF CARCASSES OF TAMBAQUI (Colossoma macropomum) JUVENILES

• Autor(a) principal: Mendonça, Pedro Pierro
• Data de Publicação: 2011
• Outros Autores: dos Santos, Monique V. Barbosa, Vidal Junior, Manuel V., de Andrade, Dalcio Ricardo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ciência animal brasileira (Online)
• Texto Completo: https://revistas.ufg.br/vet/article/view/4917
• topic: Bioclimatology; Bioclimatologia; Bromatologia; Peixes nativos

The aim of this study was to evaluate the influence of ahemeral photoperiod on the chemical composition of the carcasses of tambaqui (Colossoma macropomum). The experiment was conducted using 190 fish with average weight of 11.01± 2.08g and total lenght of 7.8± 0.18cm, stored in sixteen bowls of 56 liters of water with daily renewal of 40-times volume. The water temperarature was maintained at 29.1± 0.41°C and the stocking rate was equivalent to 2.75g/L. All tanks had constant aeration. Ahemeral photoperiods were maintained with the aid of timers. The following treatments were used: T1= 6 hours of light, T2= 12 hours of light, T3= 18 hours of light and T4= 24 hours of light with four replications each. The juveniles were fed twice a day with commercial extruded feed (28% crude protein). The experiment lasted 64 days and the chemical composition of eviscerated and shedded carcasses were analysed at the beginning, at 32 days and at the end of it for the evaluation of crude protein, ether extract, ash and non nitrogenous extract in dry matter and in natural matter. Statistical analysis of variables was performed with the aid of SAEG application, version 9.1. For performing analysis of variance, Pearson correlations and regressions were used. There was no effect of ahemeral photoperiods (p<0.05) in variables.KEYWORDS: Acquaculture; Bioclimatology; Native fish.