How does the little fish spend the winter?

When it comes to winter, it will undoubtedly make people feel cold, especially in the north, where there is heavy snow every winter, rivers are cut off because of ice, and in earlier years, they even had to spend it by hoarding vegetables. Since the winter is so cold and frozen, how do the small fish at the bottom of the food chain get through the winter?

First, how do small fish spend the winter

Most fish do not hibernate. When the weather is cold, fish live in the middle and lower layers of the water. The water at 0-4 degrees has a phenomenon of thermal shrinkage and cold expansion, so the water with high temperature sinks, that is to say, the water temperature at the bottom is 4 degrees, so the water will not be frozen to the end, and the temperature of the river at the bottom is relatively high. and it will reduce the activity of small fish. It is only when the weather is clear that the small fish come to the surface to move.

But some fish also hibernate. Carp often spend the winter at the bottom of the river, dozens to hundreds of tails gather in a circle in the bottom of the water, head and head close together, slow breathing, Gill cover movement is very slow, body temperature can drop to 1 degree Celsius, it is not until spring that "recovery" dispersed. Ding fish sleep more dead than carp when hibernating. When you dig out the hibernating fish buried in the river mud, you can't see that it is alive without a stick.

Second, how farmed fish survive the winter

1. When the fish were fed at 10 o'clock in the morning, the air temperature gradually picked up at 10:00, and the difference between water temperature and air temperature was relatively small.

two。 Pay attention to adjust the water temperature so that the water temperature is in the range suitable for the growth of fish. In winter, the water temperature can be adjusted to about 20 ℃ to narrow the difference between water temperature and air temperature.

3. Tropical fish need to use heating rods or ultraviolet lights to maintain the temperature, if it is only ordinary fish, such as goldfish, do not need any heating measures in winter.

The above is some little knowledge about the winter of fish. Do you know how the fish spend the winter?