Growth performance of catfish (Clarias gariepinus) in biofloc-based super intensive culture added with Bacillus sp

Abstract

This study was conducted to study growth performance of catfish (Clarias gariepinus) in bioflocbased super intensive culture added Bacillus sp. cells addition. Biofloc cultured in separated aquarium (100 L) was used as source of inocula for cultivation for C. gariepinus (average body weight of 2.3±0.12 g fish -1). Different concentration of Bacillus sp., cells was included in diets and in the media, i.e., (A) 10 2 CFU mL -1, (B) 10 4 CFU mL -1, (C) 10 6 CFU mL -1, biofloc without Bacillus sp., cells addition (K +), without biofloc as well as Bacillus sp., cells addition (K -, control). Results showed that the Survival Rate (SR) of catfish showed significantly different between Bacillus sp., cells addition and control (p<0.05). Growth and feed conversion ratios in Bacillus sp., cells addition were better than that of the controls. Nutrient content of biofloc containing 10 6 CFU mL -1 showed the highest protein value of 34.06%. Total bacterial cells abundance were ranging from 10 6 -10 8 CFU mL -1 cells, with or without the addition of Bacillus sp., as a control. The highest performance of catfish growth was obtained using biofloc treatment by 10 6 CFU mL -1 Bacillus sp., addition compare to other treatment.