When the cover is stripped from the sides of streams, the water temperature rises because it is no longer shaded. Warm water can cause poor health and disease in fish. Prevent muddy runoff water from construction sights from entering the stream - Water which is brown with sediment can smother fish eggs which are incubating in the gravel. Without oxygen, which is dissolved in water, the eggs will die. Also, fish food organisms will be buried and then fish may go hungry.
Every rainfall can soften and wash down stream banks, sending mud and soil into the steam.
Do not catch small fish and move them into another stream or pond, or take them home - It is illegal to catch and move fish to another stream. The fish could spread diseases to the fish in the other stream, or you could reduce the number of fish in the stream so that there would not be enough remaining to continue the species. Fish could become stranded if the stream's flow is changed. Keep pets and livestock away from streams - Livestock should not be allowed to graze on stream banks because they trample and destroy vegetation or ruin spawning gravel by walking in the stream beds. Dogs should be controlled when they are near streams, they sometimes chase spawning fish, or they stir up the mud in the stream.