Anoxia survival in common carp and crucian carp is related to high zinc concentration in tissues |
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| Authors: | Sen Shyong Jeng Tzu Yung Lin Ming Shyong Wang Yu Yin Chang Chao Yi Chen Chih Chieh Chang |
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| Institution: | Department of Food Science, College of Life Sciences, National Taiwan Ocean University, Keelung 202, Taiwan |
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| Abstract: | ABSTRACT: Ten lots of common carp and six lots of crucian carp (each lot of 100 fish) were treated under anoxia for five days at water temperatures of 25–31°C. The average per group mortality of common carp was 17%, but none of the 600 crucian carp died. The digestive tract tissues of the common carp that died had significantly lower zinc concentrations than those that survived (59 ± 41 vs 142 ± 60 μg/g fresh tissue], P < 0.001). The digestive tract tissues of the crucian carp had mean zinc concentrations of 652 ± 458 μg/(g fresh tissue). One lot of common carp that had low tolerance for anoxia was fed a high zinc diet (2000 mg zinc/kg diet) for 1, 2 or 6 months and then subjected to 5 days anoxia. The survival rates of those fed the high zinc diet 1 and 2 months increased from 0 to 50%, respectively; all of fish that had fed a high zinc diet for 6 months survived. Thus, anoxia survival in common carp and crucian carp is closely related to the high concentrations of zinc in their tissues. |
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| Keywords: | anoxia Carassius carassius common carp crucian carp Cyprinus carpio zinc |
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