Limiting amino acids supplementation in low crude protein diets and their impacts on growth performance and carcass composition in Labeo rohita (rohu) adult fish.

A Ayub,F Rasool,Matiullah Matiullah,S Parveen,T Zulfiqar,N Khan,S N Qaisrani,K M Anjum,S Mahmood,M Fatima

doi:10.1590/1519-6984.249422

Abstract

Ninety days study was conducted in hapas installed in earthen ponds. Fish of an average initial weight (220g) were evenly distributed in triplicate groups within fifteen hapas. Five experimental diets labeled as T1 (25% CP and NRC recommended amino acid level) as control diet, T2 (with 2% low protein and 5% amino acid supplementation), T3 (with 2% low protein and 10% amino acid supplementation), T4 (with 4% low protein and 10% amino acid supplementation) and T5 (with 4% low protein and 20% amino acid supplementation) were prepared. Fish were fed with @3% of their body weight twice a day at 10.00 & 16:00 hour. Significantly higher percent weight gain (420.18 ± 66.84a) and specific growth rate (13499.33±1273.54a) along with improved feed conversion ratio (1.29 ± 0.09b) and hundred percent survivals were recorded during the trial. Furthermore proximate analysis of meat showed significant improvement in the crude protein level (81.77 ± 0.19a) served with diet containing 20% limiting amino acids mixture. Therefore, limiting amino acids can be a source of cost effective feed and use safely in L. rohita diet.

Highlights

One approach to enhance the ability of survival of aquaculture is to decrease the protein level in the fish feeds (Wilson, 2002)
In this study maximum specific growth rate, improved feed efficiency ratio and percent weight gain was observed in the treatment served with 20% amino acid supplementation these results are closely related with the findings of (Guroy et al, 2017) reported similar results in Argyrosomus regius and found the maximum final mean weight gain and specific growth rate in the treatment supplemented with limiting lysine & methionine in the diet
Proximate analysis of experimental fish, L. rohita fed with limiting amino acids supplementation in low crude protein diets revealed the significantly higher crude protein level (81.77 ± 0.19a) while significantly lower lipid level (5.13 ± 0.01c)were recorded in the treatment served with 20% limiting amino acids

Summary

Introduction

One approach to enhance the ability of survival of aquaculture is to decrease the protein level in the fish feeds (Wilson, 2002). This strategy will reduce the feed cost and reduce environmental implications and sustain economic development of fish by providing less nitrogenous content. The physique of the fish retains nutritional requirements in a constant flux as these requirements may change due to different factors The results of the present research work will help in the production of cost effective feed for L. rohita fish

Methods

Results

Conclusion