Fish physiology
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Oxygen acts as the major ecological factor rendering the big influence on development of some morpho-physiological and biochemical adaptations, the factor adjusting distribution of fishes and limiting their distribution to the nature.
When an aquarium is abruptly switched on in the morning, it is noticeable that it soccupants do not immediately resume a fish normal activity. Some of a fish are on the bottom of the tank, some in the plants, and others remain almost immobilein the water
Fishes behavior in an aquarium reflects their life style in a natural habitat, albeit modified by the fact that they are living in a more cramped environment, coming into contact with other species more quickly and easily.
