Isolation and screening of indigenous nitrifying bacteria to enhance nutrient recovery in an aquaponics system

The recycling processes of aquaponic waste into fertilizers are highly dependent on the type and activity nitrifying bacteria in system. This study aims to find indigenous nitrifiers enhance nutrient recovery an aquaponics Twelve consisting ammonia nitrite-degrading were isolated from a local earthen pond Nile tilapia (Oreochromis niloticus), two isolates (AQ4 AQ12) selected due their highest capacity degrade either or nitrate respectively. Based 16S rRNA gene sequences, these identified as Marinobacter nauticus (AQ4) with 98.64% similarity, Bacillus sp. (AQ12) 99.89% similarity. When bacterial applied systems enhancement (aquaponicsBE), was significantly higher compared control (aquaponicsctrl), indicated by 500 g total harvested biomass. With significance value p < 0.05, aquaponicsBE gives 17% crude fat protein retention vegetables while fish 14% found. Energy 23% than control. Furthermore, grew better system, 0.6%BW/day specific growth rate, 0.05 feed conversion ratio that reared