■Move of habitat

In areas with large waves, you cannot dive due to the large movements of the water that shake your body.

The same applies to fish, and fish that live in shallow water move to deep water that is less affected by waves when the sea is rough due to typhoons.

The fish move to places where there is little change in salinity.

When a large amount of fresh water flows into the river after heavy rain, the fish living in the downstream area move to the offshore where the salinity changes little.

Fish is evacuating offshore

The fish move to a place with a comfortable water temperature.
In winter, the water is cooled by cold air, and the water temperature gradually drops from the surface.

However, water in deep places is not affected by cold air like water near the surface, so there is no change in water temperature.

In winter, fish that are not good at cold water move deeper place, and those that prefer cold water move to shallower place.

Which do you prefer, cold or warm？

The fish move to shallow areas due to spawning behavior.
Egg-born fish babies live in places that are rich in plankton of their feed and can protect themselves from foreign enemies.
Since plankton is often found in shallow areas, fish spawning is performed around obstacles in shallow areas.
The spawning time differs depending on the fish, and large fish may appear in a surprisingly shallow place.

Spawning in shallow places

Fish move to shallower areas in the early morning and evening.

Migratory fish are especially prone to this tendency, moving to shallower areas with abundant prey during the light hours around sunrise and sunset.

Most fish sleep at night and seem to eat a good breakfast and dinner.

Nocturnal shrimp and octopus are the opposite of fish; after eating dinner before sunrise, they sleep among rocks during the day and come out to live and have breakfast around sunset.

Migratory fish eat in shallow areas in the morning and evening.