PERTANIKA JOURNAL OF TROPICAL AGRICULTURAL SCIENCE

Water quality in the larvae-rearing environment plays a significant role in its growth and survival, especially in an open water body system. The effect of hapa placed in a tank-like structure made of canvas (hapa-canvas; HC) on the growth performance and survival of red tilapia larvae reared in Kenyir Lake was evaluated in wet and dry seasons compared to hapa without canvas as a control. The experiment was conducted for five weeks, and the stocking density of larvae in wet and dry seasons was 1500 larvae/m3 and 400 larvae/m3, respectively. Larvae were fed with commercial powdered feed until satiation twice daily and sampled weekly. The final weight of larvae reared in HC in the wet (603.3 ± 25.9 mg) and dry (1,308.7 ± 60.7 mg) seasons were higher (p<0.05) than control (398.7 ± 68.0 mg and 807.3 ± 47.9 mg; respectively). The survival rate was also higher (p<0.05) in HC (68.6 ± 7.3% and 87.7 ± 1.7%) compared to control (7.3 ± 1.0% and 74.8 ± 0.3%) in wet and dry seasons, respectively. Thus, hapa-canvas may be a good alternative to rear tilapia larvae in an open water body based on its growth performance and survival rate.

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