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Use clues to fill in the boxes in this crossword puzzle, and learn more about freshwater fish along the way.

Did you know that Earth's oceans are split into three separate ecosystems? The tropical ocean ecosystem is home to tropical fish, coral reefs, and warm water!

What's the animal that swims upstream? Help your child figure this out with this cold-blooded animal crossword puzzle worksheet.

Use your knowledge of sea creatures to fill out this crossword puzzle.

If you're taking a trip to the aquarium any time soon, be sure to print out this Aquarium Passport to bring along!