What is the principle of fish ups and downs, and what is the function of swim bladder?

Adjust the specific gravity of the fish by inflating and deflating, so as to adjust the water pressure balance inside and outside the bony fish and control the ups and downs of the body. In this way, when swimming, you only need a little strength to maintain a stable state in the water.

The pressure of seawater increases with the increase of seawater depth, which is an obstacle for fish who want to visit the seabed. Therefore, when fish want to go down to the deep water layer, some gas will be discharged from the swim bladder, which will increase the proportion of fish and make it easier to dive.

Function:

1, which helps the fish to rise and fall in the water, is also used as a stabilizer. It is located in the center of the fish and can keep the center of gravity down.

2. Make the abdominal cavity of the fish have enough space to protect its internal organs, and avoid damaging the internal organs due to excessive water pressure.

3. In lungfish and whole fin fish, swim bladder can be used as an auxiliary respiratory organ. The swim bladder can be used as a sounding cavity for sounding or receiving sound.

Extended data:

Precautions for fishing:

Fixed-point micro-bait is better than bait that needs to be shifted. After determining a fishing spot, you should always sprinkle more bait here, so that fish can often swim to the designated waters to feed and form a habit.

On the day of fishing, the temperature should be below 30 degrees, cloudy with light rain, 2 or 3 winds, after heavy rain. Fishing in these days, low temperature, high dissolved oxygen in water, active fish and strong appetite.

Catch early and catch late. Before 9: 00 a.m. and after 7: 00 p.m./kloc-0: 00 p.m., the temperature turns low and all kinds of fish eat fast, which is the prime time for fishing. Fishing at night. At night, the weather is cool, the water temperature is low, and the water surface is quiet with a breeze. Fish who are hungry all day will take the opportunity to overeat, big fish will eat by the water while it is quiet, and night fishing can avoid the sun.

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