The brook trout has a very interesting life cycle. I have some brook trout in our classroom and we get to see the life cycle of them which is so cool. Currently the trout in our classroom are in the fry/alevin. So I am going to be showing you each stage of a brook trout.

This is the first stage of the brook trout life cycle. It is called the eyed egg stage because that little dot is actually the brook trouts eye. Temperature will effect how long it takes the eggs to hatch. At once, the trout usually lays 400-600 eggs. The trout is usually in the egg for two to three weeks, then they move on to the next stage the fry/alevin.

This is the second stage of the brook trout life cycle. Although it has hatch it still has an egg sac on their stomach. Over time the egg sac starts to become part of the trout. The trout still can not swim yet so they just live on the gravel. After, they move on to next stage the sac fry stage. When the trout are sac fry they are usually about an inch in length. During this stage they start to eat and swimming because they are starting to gain most of their characteristics.

This is the third stage of the brook trout life cycle. During this stage the trout is 1-3 inches in length. This is the stage when we will be releasing our classroom trout to their natural habitat. This is the stage where the trout start to eat different things like insects and worms. This is the trout in my classroom are currently in. The video on the right is our trout in our classroom.

This is the last stage of the brook trout life cycle. After the trout are done with the fingerling stage they are now adult trout. The average adult trout is usually 6 to 13 inches. The trout will get a squared tail and a light red color on their belly where the sac used to be.