Abstract
Pejerrey Odontesthes bonariensis was reared in the recirculation system for 1 year. The system consisted of two particle-trap equipped octagonal tanks (0.75 m3) for the rapid collection of feces and uneaten feed, a mechanical filter, a UV unit, a biological filter which provided nitrification, and a hollow-fiber oxygen injection system. Total system volume was about 2.1m3. The flow rate was fixed at 2.1 m3/h. Three hundred and eighty-three pejerreyes (avg. wt. 1.6 g) were stocked in the system with salinity of 7‰, and temperature was maintained at 24 °C. After 1 year, survival rate was 92%. An average of 8.5 L of saltwater and quantity of evaporation water was supplemented to the system daily. At maximum load, just before expiry (avg. wt. 109.1 g), water quality was very good with NH4-N at 0.2 mg/L and NO2-N at 0.1 mg/L. During the experiment, nitrates peaked at 900 mg/L, but dropped to 150 mg/L after a denitrification system was installed. The effects of the water velocity on the growth of the fish were investigated by rearing in the two tanks in which the velocity differentiated. As a result, pejerreyes were reared with swimming exercise under a rotational flow at comparatively slow water velocity for a long period. A decrease in variance in growth rate was observed. It was suggested that this rearing condition, which is relatively low water velocity condition (under 1 BL/s), could be a contributing factor to not only the flesh quality of cultured fishes but their efficient production and improvement as commodities.
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Yoshino, H. (2017). Pejerrey Odontesthes bonariensis . In: Takeuchi, T. (eds) Application of Recirculating Aquaculture Systems in Japan. Fisheries Science Series. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56585-7_4
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DOI: https://doi.org/10.1007/978-4-431-56585-7_4
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