Effect of two temperatures on ammonia excretion rates of Seriolella violacea (Palm fish) juveniles under rearing conditions
2012
Nerici, C. | Silva, Adailton da | Merino, G.
Nitrogenous compounds can be toxic to aquatic animals, especially when they are reared for production purposes at high stocking densities. Seriolella violacea is a pelagic fish, native from the easterly South Pacific Ocean. This species has shown desirable behavioral and metabolic characteristics under captivity conditions, which leaded the Marine Fish Laboratory from the UCN to increase its efforts on the research and development to validate S. violacea as a new aquaculture option. Therefore, the objective of this study is to determine the excretion rates of palm fish juveniles weighing 300–500g at two different temperatures: 14°C and 18°C. Total ammonia as nitrogen (TAN) excreted was 4.4±0.9 and 7.1±1.9mgTAN/kgfish/h for 14°C and 18°C respectively. The experiments were carried out in a recirculating system operating as a farm-like situation. Tests were performed in 1000L rearing tanks operating as open respirometers. The results of the present study indicate that TAN excretion rates on S. violacea juveniles, is temperature dependent. Data obtained in these experiments are valuable information for the engineering design of land based aquaculture systems for palm fish.
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