The Bonneville Cutthroat Trout lay their eggs during spring. Their color changes during this reproduction period. The female trout seeks out a spot in the stream were the current is slow moving. She lies on her side and begins moving her tail back and forth in order to clear material away from the streambed and create a shallow nest for the eggs. This nest is called a redd. Once the redd is four to six inches deep, she will swim over the top of it while waiting for a male trout. Once he arrives, the female's eggs and the males milt are deposited in the redd. The female then swims not to far downstream and begins to build another redd. It may or may not be used, but the female is capable of building and laying eggs for multiple redds.

After a period of about three weeks the infant trout hatch. At this time they are still very dependent on their yolk sac for nourishment. As the new hatchlings age and grow larger, the yolk sacs slowly disappear.

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