What holes are there on the body of a fish and their function?

On the head of the fish there are the following holes:

The nostrils are the organs of smell.
Gill slits. Essential for breathing. When water passes through them, oxygen enters the blood and carbon dioxide from the blood enters the water.
Mouth. Water enters through it, which then exits through the gills. Also, it is necessary for fish to absorb food.

There are also holes on the body:

Anal – the release of undigested food debris.
Urinary – removal of liquid waste products.
Sexual – excretion of genital products.

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