Glow Worm is a fish based on the real-life non-aquatic Glowworm. The Glow Worms are found when you get to very deep water in Shipwreck Cove, along with the Basket Star. It takes three hits to kill and it's worth 69 coins. Although the Glow Worm is listed as a fish, it is actually an insect and a non-aquatic creature.