Alder, cottonwood trees and willows provide good root systems for this purpose, and can be planted on the banks. Trees should only be removed when they block the passage of fish. Be careful when clearing land or building near streams - Heavy equipment in the stream can ruin spawning gravel, destroy fish habitat, and damage stream banks. Vegetation which has been damaged or destroyed by construction should be replaced as soon as possible because fish depend on it for food and shelter. 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.