A Utilização de dietas úmidas para peixes ornamentais: uma nova abordagem sustentável para a indústria aquícola

Abstract

This work aimed to verify the feasibility of using home-made pâté substitution for a dry commercial diet for discus. The disc acará juveniles were acclimatized for 15 days in tanks of 1000L in the fish farm Cascavel located in the state of Paraná, Brazil. The experiment was conducted in an indoor environment in 50L tanks; supplied with constant water flow with total renewal 20 times a day; oxygen concentration 5.4mg/L and photo period of 12x12h. Water quality parameters were monitored daily: temperature; pH; dissolved oxygen. Diets were tested: DP - Pasty diet (made with tympanic fillet); DPR – Pasty diet plus feed (1:1 ratio of pasty feed plus commercial ration) and DS – dry diet. The diets, acquired from the company Poytara Ltda (Araraquara/SP), were supplemented with vitamin-mineral, vitamin C protected, betaine and kaolin. The highest growth values were observed for the pasty diet mixture and dry diet (DPR) followed by the pasty diet. Survival was higher in the batch of fish fed with DPR. Some points should be considered in the use of the dry diet that presented the best rate of protein efficiency, food conversion and high homogeneity of the lot. No significant difference in nutrient retention efficiency was found. The mixture of pasty feed and commercial feed is efficient to promote adaptive responses that converge on improvements in digestive architecture that reflect on more efficient growth responses.