Abundance and Diversity of Bacteria on Catfish Nursery Rearing (Clarias gariepinus) With Closed Water System (Close Water System)

Abstract

This research aimed to identify types of bacteria existed in nursery rearing pond of catfish (Clarias gariepinus) using closed water system. The observed data include bacterial abundance and diversity in the water and in the fish digestion system, fish growth and water quality. This research was performed in the media of 3 concrete pools with the size of 3 x 1 x 0.8 m3 containing fish stock spreading of 3000 tail / pond. The obtained results showed that the highest abundance of bacteria was found in the surface and the bottom of pond C with the abundance number of 3,0 x 104and 1,2 x 103for aerobic and anaerobic bacteria, respectively. Moreover, it was figured that the dominant bacterial species found in the water and the gastrointestinal tract were from the genus of Bacillus, Clostridium and Lactobacillus. Meanwhile, water quality in the pond was observed in the normal range with the temperatures of 28 - 30 oC, pH (6.0 - 7.0), DO (4.5 - 5.7 ppm), ammonia (0.06 - 0.03 ppm), nitrite (0 ppm) and nitrate (0 - 5 ppm). Keywords: Type of bacteria, catfish (Clarias gariepinus), Closed water system.

Nursery of bonylip barb fish Osteochilus hasselti in an aquaponics system

“…The microbes ecosystem is very important to water biological filtration and nutritional mineralization for plant growth therefore the function of aquaponics system can be optimal (Kasozi et al, 2021). The increase of bonylip barb fish stocking density in every 50 ind./m 2 increased the bacteria abundance into seven, eight, nine digits number at the end of this study, meanwhile in recirculating aquaculture system (RAS) for catfish rearing, the bacteria abundance was only reached 3×10 4 CFU/mL (Azhar et al, 2017).…”