The study monitored the productive performance of the paiche (Arapaima gigas) for 30 months under temperate climate conditions on the Central Coast of Peru. After 40 days of acclimatization and with 80% survival, the fish (n: 32, weight: 44 ± 34 g, length: 17.6 ± 4.9 cm) were transferred to a greenhouse pool (8 fish/m3) and fed at 5 % of their body weight with a diet of 60% balanced trout food and 40% deboned and gutted fresh fish. After 15 months under a greenhouse and with 62% survival, the fish (n: 20, weight: 4.3 ± 1.0 kg, length: 77.3 cm) were transferred to an open-air excavated earth pond (6.9 fish/m3) and fed fresh fish at 5% of body weight. The water temperature fluctuated between 23.2 and 26.0 °C in the greenhouse, and between 23.0 and 24.6 °C in the environmental pond, being up to 18% lower in temperature with respect to the minimum water temperature in its natural habi...