① Fish live in groups, which can improve the safety of fish. A large number of fish schools can effectively distract the enemy's attention to individual fish, thus reducing the success rate of enemy predation. Therefore, fish clustering can prevent the effective attack of fish damage.
② Fish live in groups, which can effectively improve the success rate of feeding. If the food is large, it needs group cooperation to break it down. Or it is necessary to collectively drive food to a certain place and then pick it up.
3 Fish live in groups, which is more conducive to building holes to keep warm. Fish have the habit of building caves somewhere in the pond for the winter, so it will definitely be better to build caves together. Moreover, clustering in a nest makes it easier to raise the surrounding temperature, which is beneficial for fish to consume less energy and maintain the basic operation of the body.
Sick fish seldom flock together. When they are sick, they all drift away from the group, then slowly swim to the shore or the corner of the pond, and finally die in loneliness. Maybe they don't want to infect their own kind. But there are also the following two special cases. (1) Of course, fish flocks may sometimes be caused by pathological factors. The most common disease is horse racing.
Horse racing disease is a common problem in all kinds of fry culture. Strictly speaking, it belongs to malnutrition caused by starvation of fry. The main performance is that the fry swim wildly along the pond. If not handled in time, fry will die slowly.
Horse racing disease often occurs in ponds with thin fry ponds, few plankton and high culture density. When the artificial feed is insufficient, the fry in the pond will be hungry and even malnourished. Cause horse racing disease.
When horse racing disease occurs in ponds, reed mats, haystacks, etc. We should immediately block the route of horse racing in exchange for fry to prevent the situation from deteriorating. At the same time, a large number of high-quality feeds, such as fish meal and soybean meal, should be fed immediately. Secondly, the pond should be fertilized immediately to increase the amount of natural bait in the water (it is best to use high-quality farmyard manure). For ponds with high culture density, seedlings should be thinned immediately.
When there is shallow hypoxia in the pond, fry will also cluster in areas with running water or shallow water. This situation is easy to judge. Hypoxic fry generally float on the water and move slowly. And the gathering places are generally in areas with running water or shallow water. These areas are gathered here because of their high dissolved oxygen.
In view of the lack of oxygen in fry, an aerator is generally installed and started to increase nutrition. Of course, high-quality fresh water can also be added to improve dissolved oxygen. Long-term hypoxia in the fry pond should find out the causes of hypoxia, such as whether the breeding density is too high and the water quality changes, and then deal with the symptoms.
To sum up, fish like to live in groups, and sick fish rarely flock. But the silver carp fry population may be a case of horse racing disease and hypoxia, which deserves attention. Personal views are for reference only.