Effects of Turbidity Controls on Growth and Survival of African Catfish (Clarias gariepinus) Fingerlings
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Abstract
The purpose of this study was to investigate the effects of turbidity controls with various levels on the growth and survival rate of African catfish (Clarias gariepinus) fingerlings, and study the change of water quality throughout the nursing period. The experiment was conducted in 5 treatments with 3 replications. Treatment 1: exchanging 50% of water every day. Treatment 2-4: exchanging 50% of water when turbidity range 22-23 cm (≤80 NTU.), 13-14 cm (≤120 NTU.), 8-9 cm (≤160 NTU.) and Treatment 5: without exchanging water throughout the nursing period, respectively. Experimental fingerlings were carried out with 21 days old. The aver age Initial weight was 1.90 g and 6.25 cm in the average Initial length. Floating pelleted feed containing 35% protein was fed Ad libitum three times a day. Nursing in a black plastic tank containing 50 liters freshwater with 50 fingerlings per tank for 30 days. The results found that, turb idity control was not less than 13-14 cm (not more than 120 NTU.) throughout the nursing period. It was a suitable situation for this nursing. This condition exchanges the water 13 times that uses only 7.5 liters of water per fingerlings. This condition the final average weight of fingerlings was 14.03±2.64 g/fish The average daily growth was 0.41±0.09 g/day and survival rate were 92% Under this condition on the last day, pH 7.87±0.42 water temperature 27.35±0.07 °C dissolved oxygen 0.20±0.00 mg/L total ammonia was 11.85±0.53 mg/L and turbidi ty was 120.43±1.64 NTU.
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References
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