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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Jeng, S.S., Lin, T.Y., Wang, M.S. et al. Anoxia survival in common carp and crucian carp is related to high zinc concentration in tissues. Fish Sci 74, 627–634 (2008). https://doi.org/10.1111/j.1444-2906.2008.01567.x
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DOI: https://doi.org/10.1111/j.1444-2906.2008.01567.x