Two weeks before and during testing periods, and the food was given randomly regardless of temperature regime. The water surface always maintained more than two granules and less than 20 granules of food for each fish. During 6:00-18:00 a.m. to p.m., fluorescent lamps with light intensity of 2 000-15 000 lx were used, simulating nature illumination. At night, between
18:00 p.m. and 6:00 a.m., no artificial light was provided. During the experimental period, the water in the aquarium was exchanged 1/5 each day, and the excretions were siphoned off every day with minimal disturbance to the feeding of the fish being tested.
Two weeks before and during testing periods, and the food was given randomly regardless of temperature regime. The water surface always maintained more than two granules and less than 20 granules of food for each fish. During 6:00-18:00 a.m. to p.m., fluorescent lamps with light intensity of 2 000-15 000 lx were used, simulating nature illumination. At night, between18:00 p.m. and 6:00 a.m., no artificial light was provided. During the experimental period, the water in the aquarium was exchanged 1/5 each day, and the excretions were siphoned off every day with minimal disturbance to the feeding of the fish being tested.
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