Check out these activities from the Council for Environmental Education's Project Wild:
Fashion a Fish — Grades K–4: Students create fish with special adaptations.
Net Gain, Net Effect — Grades 5–8: Students learn about different fishing techniques and how they impact fish populations.
GO FISH! — Students learn about the components of habitat through this fun and active outdoor activity.
School of Fish
Did you know that you can raise your own trout in your classroom? Kids love to watch the trout eggs hatch into small fry. Learn more by contacting your local Fish and Game office or your local Trout Unlimiterd chapter. For more information about the program, go to the Ted Trueblood Chapter of Trout Unlimited site. Supplement this activity with a lesson on Idaho's native trout from the American Fisheries Society.
Check out the live cameras broadcasting from the National Aquarium in Baltimore. Livestreams from the coral reef and blacktip reef allow students to observe and identify tropical fish and sharks.