you will go mad if you know that africans catch a fish rigth from under the ground

Deep hole fishing  is traditional in Cambodia and other areas of South Asia.

A hole is dug down (around a two or three feet deep and around two feet across) near the water line of a wetland, swamp, flooded rice field, pond, canal, slow-moving river etc. A smooth, shallow berm is formed separating the hole from the water line so as to prevent the hole from filling in completely with water (which would render it useless as a trap). The bottom of the hole is filled to a shallow level with water so that trapped fish don’t suffocate or dry out and die before they can be collected. Branches with foliage and sometimes grass as well are placed loosely over the hole so as to provide some cover.

In most cases the fish caught are snakeheads of the genus Channa (and sometimes perch) native to South Asia. Both species prefer vegetative cover (hence the branches) for shade and protection from predators and they will commonly explore areas along the banks for cover and food (expecting that the water levels will generally be the same) . Snakeheads are not only capable of breathing air but also of moving across land by wriggling  and to a smaller degree with their pectoral fins. The fish go into the hole and can’t get out.

Once a fishing hole will no longer be actively checked and harvested it should be filled in to prevent additional fish from getting trapped in it.