期刊
JOURNAL OF APPLIED ICHTHYOLOGY
卷 20, 期 6, 页码 488-492出版社
WILEY
DOI: 10.1111/j.1439-0426.2004.00601.x
关键词
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The respiratory behaviour of the sharpsnout sea bream (Diplodus puntazzo) with fish weights between 15 and 509 g at temperatures of 15-29degreesC was studied, with special attention paid to critical and lethal oxygen saturation (S-crit and LC50, respectively) and ventilatory frequency (V-f). The species maintained a constant oxygen consumption rate regardless of the concentration of dissolved oxygen, until S-crit was reached. The mean of S-crit and LC50 was 34% (2.4 mg L-1) and 11% (0.8 mg L-1), respectively. The S-crit was independent of fish weight and temperature, whereas the LC50 values were positively correlated with both factors (P < 0.05). The higher resistance in small fish could be due to their greater V-f response to hypoxia than in larger animals. Furthermore, the increased metabolism resulting from the effect of temperature was offset by an increased V-f. The V-f remained constant down to a mean value of 67% oxygen saturation, regardless of fish weight and temperature. These findings suggest an optimum oxygen saturation of above 70% for D. puntazzo culture.
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