Abstract
In the quest for appropriate management strategies for less egg production in Nile tilapia (Oreochromis niloticus) due to climate change induced increasing temperature, five treatments (T): shade with cloth over brood hapa (T1), increase in pond depth (T2), aeration (T3), combination of above three interventions (T4) and control (no intervention) (T5) were investigated in a commercial hatchery in Mymensingh, Bangladesh during April to September. Mean egg production in T1, T2, T3, T4 and T5 was 20488, 15369, 3596, 21021 and 3979 eggs/hapa, respectively. T1 was the best strategy considered due to efficiency and simplicity. In May T1, T2, T3, T4 and T5 produced highest 30859, 36119, 8997, 45876 and 5506 eggs/hapa at 29.69°C, 30.12°C, 29.96°C, 29.61°C, and 31.26°C temperature, respectively. The most suitable water temperature for highest egg production (20365 eggs/hapa) was 29-31°C. Egg production above 32°C was found to be very low (179 eggs/hapa). Suitable ranges of dissolved oxygen, pH, alkalinity, ammonia and turbidity for egg production were found to be 4.5-6.0 mg/L, 8.0-8.8, 105-150 mg/L, 0-0.5 mg/L and 15-35 cm, respectively. In high temperature months commercial fish hatcheries should use shed with cloth over brood hapa to produce higher amount eggs.
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