Penis fish
Urechis unicinctus
Penis fish live in sandy or muddy tidal flats, occupying deep U-shaped burrows. They pump water through the tunnel and trap plankton and organic particles in a mucus net for food. The worm retreats into its burrow when disturbed, using its muscular body to brace against predators. Although commonly called a fish, it is an annelid worm rather than a true fish.
- Type
- Burrow
- Conservation status
- NE
Growth chain
- ?
- Penis fish