Stowfish

Stowfish are tiny, leech-like fish which are seen in The Legend of Zelda: Phantom Hourglass.They are small, green fish that can be found squirming around when the player catches a large fish such as a Loovar or a Rusty Swordfish.When they are spotted, the camera will move towards the Stowfish and Celia will tell you that they make her happy for some reason.The game does not give you a size record for these fish, but it will count how many have been caught.

These fish act similar to two real fish known as Lampreys and Ramoras.

Glitch
In some rare cases, if the DS is closed while the camera zooms in onto the Stowfish, the Stowfish will still be squirming like normally,but the cutscene will freeze and the game must be reset.