Fluctuating temperature regime impairs growth in giant gourami (Osphronemus goramy) larvae

Growth and physiology were compared in giant gourami (Osphronemus goramy) larvae reared constant (25, 30, 35 °C) daily fluctuating (25–35 temperature regimes. Larvae aged eight days post-hatching indoors for 21 four closed recirculating systems (four aquaria per system) the different Samples of collected every week from each regime growth measurements. At end experiment, cortisol glucose concentrations, as well oxygen consumption ventilation rates, determined fish regime. Results showed that did not affect survival or abnormality, but significantly impaired larvae. Physiological responses, assessed using levels consumption, corroborate previous findings, suggesting a stable 30 °C is optimal rearing Our experimental approach demonstrated variations observed larval structures on small-scale farms are likely to impair production fry.