river fish

the movement of fish.

in order to better service in the water , fish respond to different stimuli . the response to light ,for example , is very important for fish . some respond negatively , that is , they avoid light and remain at the bottom of the river . the fish called miller's-thumb lays it's eggs beneath rocks and submerged tree trunks and the males watch over them until the eggs are hatched.

 SRI LANKA RIVER FISH