Blackout in the biofloc caused fish mortality by ammonia
Resumo
The goal of this work was to explain the mortality of Nile tilapia (Oreochromis niloticus) reared in Bio-floc Technology (BFT), after a power failure. Six hundred Nile tilapia juveniles were being reared into three polyethylene tanks with BFT. In March 2018, a power failure occurred for about 12 minutes. Dissolved oxygen and temperature were constantly measured after reconnecting the power, while total ammonia nitrogen (TAN) was measured 5 minutes after reconnecting the system power and 12 hours late. Fish mortality was quantified 1, 2, 6 and 12 hours after reconnecting the system power. The water temperature did not alter during the power failure and dissolved oxygen was below 1.0 mg.L-1, however, five minutes after reconnecting the system power, dissolved oxygen were restored above 4.9 mg.L-1. Six hours after reconnecting the system power the mortality were 8.11% of the population and 100.0% after 12 hours. After 5 min TAN was 11.28 mg.L-1 and 12 hours later the concentration was above 125.00 mg.L-1. The cause of fish mortality was the increase in the TAN concentration, due to the lack of oxygen during the power failure.
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Referências
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