One of the smallest nudibranch species, Trapania goslineri, is only about 8 millimeters long — a bit slimmer than your finger!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Male seahorses’ pouches develop when they’re about 5–6 months old!
Great White Sharks are listed as vulnerable to extinction, which means we need to work hard to protect them!
Jellyfish eggs are microscopic and can number in the millions for a single adult jellyfish!
Basic Information
Catfish belong to the order Siluriformes, which includes over 3,000 different species of fish!