The video below shows the processes they use to fertilize trout eggs & how they raise the fish from eggs to fry. It's a very interesting 'behind-the-scenes' look at some of what goes into raising all those trout.
Filmed at the Huntsdale hatchery in Carlisle, PA this same thing happens at state hatcheries across Pennsylvania. Some hatcheries even allow for visitors. To find a PA Fish & Boat Commission hatchery near you, click HERE.
Take a look at some of the work that goes into raising the stocked trout we catch.