Monthly Archives: March 2015

Trout Spawning Habits

Spawning trout

Spawning cutthroat trout Photo by NPS

As the time approaches, the females will be busy searching for an area within clear water, often times under the cover of shade. They will also try to make sure the area has gravel and good water flow, because gravel will eventually help top protect the eggs. This will be where she will want to build her red, which is her nest.If the female trout finds a site that she deems suitable, she will use her fins diligently to create a depression within the area. As the females are working hard to create the nest, other males will try to impress her with their mating dances. Once the female is ready with her nest complete, the male will swim up next to her.
When the time comes, the female will release her eggs into the water. The male will release its milt. Soon the eggs will be fertilized. Then, the female will cover the eggs up with gravel before moving on to another site.
Once the female moves to another area, she will proceed to lay more eggs with around two or three different males at different places. A typical 13-inch trout is capable of producing over 1,000 eggs within days.

What Happens to the Eggs?

As the fertilized eggs remain within darkness, they will start going through water hardening with the first hour of being laid. During this time, the pores within the eggs seal. They will remain as sticky eggs in a green egg stage for at around 20 days. During this time, they are extremely fragile and prone to damage. Then, the eggs will become clear and pink as eyes grow. This means that the egg has entered eyed egg stage. For around 2 to 3 weeks, the eggs will remain in this stage.
Then, alevins will appear. This means that the trout is not ready to go off yet, but will eat from a yolk sac that is connected to their bellies. Alevins are a young stage during the trout life cycle. They will stay inside until all of the yolk sac is completely absorbed. Again, at this time, they are very vulnerable still. Once there are no more yolk sacs, they will become free and float towards the surface as they look for food.