Enzimas digestivas de juvenis de carpa capim alimentados com forragem e ração

Abstract

The activity of digestive enzymes of grass carp (Ctenopharyngodon idella) juveniles fed with teosinte grass and ration during 45 days was evaluated in 240 juveniles (20.15±0.23 g), reared in 12 water recirculating tanks (20 fish/ tank). The treatments were: C= only teosinte grass; SD= teosinte grass+daily supplementation (3% BW); SA= teosinte grass+supplementation every two days (3% BW); R= only ration (3% BW). After the feeding period, 6 fish per treatment were killed for analysis (in anterior and posterior intestine) of digestive enzymes: amylase, maltase, trypsin and chymotripsin. The weights of liver and digestive tract, tract length and relative weight gain also were evaluated. The association of grass and ration, daily, results in higher liver weight and relative weight gain and lower maltase activity. It was not observed effect (p>0.05) in amylase activity, weight and length of tract. Alkaline proteases activities are lower when grass carp juveniles fed only ration.