Afterwards the female digs the upstream side of the redd and the sediment covers the eggs. Sometimes other males in the area also deposit sperm in the redd. Trout do not attempt to care for their young after they hatch. Threats A big problem that trout are facing today is the destruction of habitat. Many trout streams are being overwhelmed with excess silt.
Silt is the result from poor farming practices, overgrazing of stream banks and logging.
The excess silt clogs the spaces between the gravel. This destroys insect habitat and suffocates trout eggs. Whirling disease is a very large threat to all trout as well as rainbows in the northwest U.S., specifically, the streams and river of Montana, Colorado, and Utah. This disease disrupts the equilibrium of trout which causes a tail chasing effect, hence whirling disease. The fish can not catch food so they starve to death.