In fish, like in other poikilothermic organisms, the metabolic rate correlates with water temperature;
the activity of fish in the temperate zone therefore usually decreases in winter (Ultsch,
1989). This low physiological activity may result in higher predation by homoeothermic predators
such as birds or mammals (Stewart et al., 2005; Dekar et al., 2010). However, there is a
more serious threat affecting the fish stock during winter in some localities; namely, oxygen
In fish, like in other poikilothermic organisms, the metabolic rate correlates with water temperature;the activity of fish in the temperate zone therefore usually decreases in winter (Ultsch,1989). This low physiological activity may result in higher predation by homoeothermic predatorssuch as birds or mammals (Stewart et al., 2005; Dekar et al., 2010). However, there is amore serious threat affecting the fish stock during winter in some localities; namely, oxygen
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