When you fork the fish, do you aim at the harpoon or fork it under or above the fish? Why?

In the process of fork fish, fork under the fish you see.

This is because light is refracted when it is obliquely incident from water into the air. When the light emitted by fish enters the air from water, it will be refracted. Because the refraction angle is greater than the incident angle, the refracted light enters the human eye, and the human eye will look against the direction of the refracted light and feel that the fish is shallow (hooked). What the eyes see is the virtual image of the fish, above the fish. So to fork the fish, you need to fork under the fish you see.