What is the reason for the fish with no mouth?

I. Weather, water temperature and environmental factors

There are few aquatic plants and algae in winter, and the oxygen produced by photosynthesis is much less than that in summer, so there will be hypoxia at the bottom of the water, the activity of fish will be reduced, and the enthusiasm for eating will be reduced. If the oxygen content in the bottom of the water is low, the fish will float and don't like to go to the bottom. In addition, in the weather with low air pressure, the dissolved oxygen is low, the activity ability of fish is poor, and even floating occurs. In this case, even if your bait is delicious, the fish will not talk easily.

Second, the influence of human factors.

In natural waters, due to the large water surface, the water has strong self-purification function and high oxygen content. However, in the artificial small water environment, due to fishermen's fishing, a large amount of nest material and hand food will aggravate the deposition in the fishing process, which will lead to the aggravation of underwater corruption and indirectly lead to the lack of oxygen at the bottom, and fish do not like to feed at the bottom. In addition, human voices, footsteps, roaring machines, throwing poles into the water, and swaying figures on the shore will all affect the fish's bait.

Third, changes in fish conditions affect the harvest.

Fish will be affected by the water environment, or by fishermen's fishing methods, and active or passive watershed aggregation will occur, which is what we often call "fish floating". Failure to find a suitable fish layer will also lead to no food. In addition, the fish was bumped, deprived of oxygen and injured during transportation, which made the fish in poor condition before being thrown into the black pit. Coupled with the large amount of fish, the density of fish in the pit is high, which further aggravates the degree of hypoxia and fright of fish, and also leads to fish not talking.