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Hibernation is basically a period of metabolic depression and inactivity. It is usually observed during colder seasons like winter. During those moments, warm-blooded organisms or endotherms are able to regulate and maintain their bodies at a favourable temperature, and this comes with very slow heart rate and breathing rate. These endotherms undergo such process in order to conserve energy when there isn't any food available. So in generally sense, hibernation is an energy saving state.
Cold blooded organisms or ectotherms like fishes are unable to actively regulate their rate of metabolism or temperature of their bodies, so they can not hibernate. However, these organisms are able to experience reduction in the rate of their metabolism when found in colder regions, and sometimes undergo a period of dormancy when there is low oxygen concentration. Most fishes migrate to suitable environments when they meet unfavourable conditions.
In conclusion, the ability of fishes to survive colder temperatures and lower oxygen-concentration periods is not the as same as how warm-blooded animals undergo hibernation or the energy-saving state.