Effects of Exogenous Multi Enzyme on the Growth, Blood Parameters and Flesh Compositions of Labeo Rohita (H)

As exogenous enzymes inclusion in aqua-feed is increasing in our country, a study was conducted to evaluate the effects of a exogenous multi enzyme on the growth, blood parameters and flesh compositions of Labeo rohita for 90 days feeding trail in twelve cages set in the pond of Department of Fisheries, University of Rajshahi, Bangladesh. The study was conducted under 4 treatments with 4 types of feeds prepared by using aquazyme plus (trade name) at the rate 0.0, 0.5, 1.0 and 1.5 g/Kg feed treated as T1 (Control), T2, T3 and T4, respectively. The study was carried out through measuring growth and feed utilization parameters (Weight gain, SGR, FCR and survival rate), blood parameters (WBC, RBC, Hb, PCV, MCV, MCH and MCHC) and flesh compositions (moisture, crude protein, lipid, ash and carbohydrate) of the fish according to the standard methods. During the study period, there was no significant difference in the water quality parameters among the treatments and were within the suitable range. Significantly higher weight gain and SGR were recorded in T4 (461.37±2.23 g and 1.28±0.04 %) and the lower in T1 (321.62±13.1 g and 1.03±0.027 %). The better FCR was found in T4 followed by T3, T2 and T1. There was no significant difference in survival rate among the treatments. Exogenous enzyme inclusion in feed had significant effects on blood parameters of the fish. Moisture, ash and carbohydrate contents of the fish flesh were increased with the increasing dose of enzyme in the feed whereas crude protein and lipid contents were decreased. The present study concluded that the use of exogenous multi enzyme in feed increase the growth, change the blood parameters and flesh compositions of L. rohita.