Striped Threefin

Interesting Info

• The Striped Threefin is a tiny triplefin with crisp pale stripes on a reddish upper body and a bright yellow eye.
• In Australia it’s a tropical reef fish found on the northern Great Barrier Reef (Queensland) and offshore reefs of far north Western Australia.
• Globally it lives in the western Pacific, from southern Japan through the Philippines and Papua New Guinea to Australia and the Solomon Islands.
• Often perches in small groups on sponges and coral heads, watching for tiny drifting prey.
• A quick “zooplankton snacker”: it darts out to grab passing specks from the current.
• Triplefin means three separate dorsal fins lined up along its back—like three little sails.
• Not especially shy; careful snorkellers can often get a close look.
• Eggs are attached to algae or rock by sticky threads; as in many triplefins, males likely guard the nest until hatching.
• Lifespan isn’t well studied, but like many tiny reef fishes it probably lives only a few years.
• Predators include small reef hunters such as juvenile wrasses, sticking close to coral gives good cover.
• By turning drifting plankton into fish biomass, it helps feed bigger reef animals.