Reservoirs in winter at low temperature, namely, with zero already has the properties of freezing and becoming ice. The water freezes, gradually starting from the surface and thus depriving underwater inhabitants a sufficient amount of oxygen. The instinct of self-preservation in many fish during cooling works in the form of winter hibernation, most fish in whole groups are looking for a modest shelter at the bottom of water bodies or some kinds of chilles. Thus, it is easier for fish to transfer the cold and dark season.
How the inhabitants of reservoirs winter
Due to the lack of oxygen, life in reservoirs practically stops, small fish, which was a feed for larger fish, stops moving, settling at the bottom with nothing, not eating and practically without eating oxygen. The heartbeat in fish becomes even slower, and it even stops growing.
Underwater algae in winter cease to be useful, they do not emit oxygen.
As for the fish of predators, it remains active in the constant search for food and oxygen. It is such a fish that comes across avid fishermen on winter fishing. Active inhabitants in reservoirs are pikes, ruffs, pike perch.
On frozen reservoirs, you can often see an ice hole with reeds sticking out of it, thus, fishermen protect fish and residents of frozen water from a lack of oxygen, which enters the open hole. If this is not done, the fish suffocates and after the spring thaw on the shores of such waters you can see a large amount of dead fish on the surface of the water.
Mammals equip their dwelling in a pond, accumulate fat in order not to die from the cold and hunger and hibernate, these include muskrats, water rats, beavers, but the latter can settle on land.
How the inhabitants of reservoirs winter
Birds, and these are mainly ducks, swans, cranes, heron, etc.D. They leave the reservoir during winter and fly to the warm edges, since they less adapt to life in the pond where there is little food and low air temperature.
Frogs, they are inactive in winter, with the onset of cold weather they hide at the bottom of the reservoir, burrowing into the silt. Cold -blooded residents have the ability to be without oxygen for a long time, due to low body temperature. They adapt to the environment and how fish stops eating and breathing, saving oxygen reserves in water. Sometimes frogs can be found near a reservoir under stones or earthen snowdrifts.