Níveis de lipídeos na alimentação de Acará disco

Abstract

The present study was conducted to investigate the effects of the inclusion of lipids in the diet of discus and its effect on the growth, metabolism and histopathological response of the intestine and liver. The fish (initial weight 2.15 ± 0.15 g, and initial length 3.81 ± 0.50 cm) were fed for 60 days with three commercial diets containing 3%, 10% and 14% lipids (LP). The fish (15 individuals per aquarium) were placed in 12 50 L glass aquariums, divided into three treatments with four replications. Fish fed diets with 10% LP showed better protein efficiency rates, and a condition factor three times higher than other treatments. Digestive lipase proved to be responsive up to the level of 10% LP. Associated with this, there was an increase in the activity of alkaline phosphatase in the digestive tract. There was a reduction in albumin values in fish fed with 14% LP. The morphometry of the intestinal villi revealed that there was an increase in this structure as the level of lipids in the diet increased, with the highest height observed for fish fed with 14% LP. For this study, the adequate lipids level to maintain the development and health of Acará Disco is 10%.