Sunday, February 26, 2012


As part of our year-long study of water, we are raising trout from the eyed-egg stage until we release them as fry, in May. Katrina from Portland Water District came by with these awesome costumes to help us remember the stages in the trout life cycle, and the parts of an adult trout's anatomy.

Molly models the eyed-egg stage, while Brendon is wearing the yolk sac that the alevin have. Alevin get their food from their yolk sac. This is a good thing, since they don't have mouths yet!

Once the trout develop into the next stage, fry, they are starting to look more like trout. This stage is when they develop a mouth, which Shaunna is demonstrating.

Pamba is showing what the belly of the trout looks like. Trout have a variety of fins to help them swim around in the water.

If you look closely, you can see that Jimmy is wearing the caudal fin and caudal peduncle, which is the powerful muscle that attaches the caudal fin to the rest of the trout's body.

Notice, also, that Shaunna's head now has eyes. Trouts' eyes are on the sides of their heads. This allows them to have a wider range of vision to the side and back to look for food and watch out for predators.

Sydney shows what the complete trout looks like with all the parts.                                                                                                
Thanks, Katrina, for the cool lesson!

We can't wait until our trout hatch so we can see them develop for ourselves!

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