BIOFLOC CULTURE METHOD FOR GROWTH PERFORMANCE, SURVIVAL RATE AND NUTRITIONAL COMPOSITION OF SNAKEHEAD FISH (Channa striata) ON NATURAL EXTRACT SUPPLEMENT

Abstract

Snakehead fish (Channa striata) is a well known and important freshwater fish in Southeast Asian countries. The experiment was conducted at Sher-e-Bangla Agricultural University Biofloc Culture Lab to evaluate the growth performances, survival rate and nutritional composition of snakehead fish (C. striata). There has four treatments with three replications. Water quality parameters were monitored through temperature, dissolved oxygen, pH, ammonia, total dissolved solids, alkalinity and hardness. Maximum length increase (14.15±0.2) cm of C. striata was found in treatment-4. Highest weight gain also noticed in the same treatment which was (105.67±6.65)g. Control treatment showed lowest performance among the parameter studied. Maximum specific growth rate was 2.70% in treatment-4 whereas 2.50% was minimum in treatment-1. In treatment-3 survival rate was highest, which was 75.76% and in control treatment, the lowest survival rate was recorded that was 47.88%. Feed conversion ratio was better (1.08) in tretment-4. Daily mean weight gain was noteworthy in treatment-4 which was 1.50g and lowest daily mean weight gain was recorded 1.1g in control treatment. From the analysis of proximate composition of C. striata 69.67% protein content was available in treatment-4 which was maximum and the lowest protein content was found 61.84% in treatment-2. Considering all the results, the optimum growth performance and nutritional composition was better in treatment-4 (Extract of Garlic and Amla) compared to other treatments. In the era of aquaculture and microbial biotechnology there has a huge potentiality to fulfill the requirement of fish protein by the culture of C. striata in biofloc technology.