Trial rearing hybrid grouper with BIOFLOCS technology

Abstract

This study aimed to determine the eff ects of Bioflocs, stocking density in composite tanks on growth, survival rate and FCR of hybrid grouper. The experiment was carried out with hybrid grouper at the fi ngerling stage with the average size of 3.12±0.25 g, in 12 composite tanks (1m³/tank) with 4 treatments (density of 30 and 50 fish/m³, applied Bioflocs or not), and each treatment was triplicated. The results showed that using commercial feed for marine fish with 44% protein for rearing hybrid grouper in tanks in 8 weeks applying Bioflocs technology led to better growth rate, higher survival rate, lower FCR than those of not applying Bioflocs technology, and when rearing at the density of 50 fish/m³ the results were equivalent or better in terms of the assessment parameters compared to the rearing at the density of 30 fish/m³. In order to save area for rearing fish, it is recommended to raise hybrid grouper using Bioflocs technology at a density of 50 fish/m³.

DOI: https://doi.org/10.53818/jfst.4.2022.24