Abstract
This study evaluated the survival, growth performance and hematological changes of juvenile Pacific cod Gadus macrocephalus in land-based culture tanks with different water temperatures using deep sea water. Experimental water temperatures were set at 6, 10, and 14 °C by mixing surface sea water and deep sea water. One hundred juveniles (120.3 ± 26.3 g, 22.0 ± 1.2 cm) were placed in each experimental tank (2 m in diameter × 0.65 m water depth). Fish were fed twice daily with extruded pellets to satiation for the 55-day experiment. Growth performance and blood chemistry were analyzed at the end of the experiment. Pacific cod were not tolerant of long-term exposure to a water temperature of 14 °C, while their feeding activity and metabolism were still active. Hematological changes suggested that Pacific cod were stressed at both the lowest and highest temperatures examined in this study. In summary, the results in this study suggest that a water temperature of 8.5 °C may be the most favorable temperature for optimal growth performance and physiological activities of Pacific cod with a size range of 120–180 g.
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