Uso de torta de mamona na alimentação de jundiá (Rhamdia quelen).

Abstract

The nutritional requirements of fish is essential for proper growth of them, but this is the main cost of production. The current world production of fishmeal is not able to meet the demand for production of feed for aquatic organisms. In response to this demand, the price of the product has undergone frequent increases. With the increasing expansion of biofuel production in the country, replacing conventional ingredients residual plant biomass becomes a possible option for reducing feed costs in fish farming. Stimulate the production of native species provides greater sustainability to the environment and ensures the existence of native fish populations in the local ecosystem. In this context, the choice of catfish for cultivation in Rio Grande do Sul, presents itself as an excellent alternative, since their adaptive characteristics to the region, being a kind of easy induction of spawning and feeding habits have varied. The objective of this study was to evaluate the growth performance of silver catfish fed with increasing levels of inclusion of castor cake, presented as a possible substituent protein and energy of feed ingredients. For this, 300 silver catfish (R. quelen) were used with an initial average weight of 10,49 ± 1,41 g and total length of 11,14 ± 0,51 cm distributed in a completely randomized design with 5 treatments : MC, M5, M10, M15 and M20, being respectively: (control, 5 %, 10 %, 15 % and 20 % inclusion of castor cake without detoxification treatment ) and 4 repetitions, lasting 60 days. After this period were evaluated final weight, HSI, CF and body composition. The results indicate that the use of biomass to levels of up to 15% of meal is possible without prejudice weight gain.