Effects of Water Treated with Bio-disc on Growth Performance of Clarias gariepinus Fingerlings (Burchell 1822).

Apstrakt

An eight-week experiment examined how Bio-disc-treated borehole water affected water quality and Clarias gariepinus fingerling growth. Fish in 20-liter plastic tanks (50cm × 40 cm × 30 cm) were fed a commercial diet with 40% crude protein twice daily. Each aquarium held 25 fish (average weight of 2.40g). Three replicates were used in four experiments (D1–D4). Per experimental needs, pre-conditioned borehole water was added to the tanks weekly. D2 water was energised with Bio-disc once a week, while D1 water was changed without treatment. D3 water was energised twice a week, and D4 water was thrice, using Bio-disc. The experiment water was energised by running water from the Bio-disc into the tanks for 30–60 minutes. D3 showed the best growth performance, with a weight gain of 27.64 ±0.70g and a specific growth rate of 4.49±0.05 g/d. The D2 and D4 significantly outperformed the control experiment (D1) (p < 0.05). D3 has much higher values than others, indicating that Bio-disc water treatment twice a week improves fish growth. Although Bio-disc treatment does not affect water quality, it improves water conditions and fish growth.