Caesioscorpididae

Blowhole perch

Caesioscorpis theagenes

One species holding a genus on southwestern Australian shores

• Temperate
• Local endemic species
• Restricted distribution
• Marine fish
• Indian Ocean
• Oceania
• Small
• Temperate fish

Caesioscorpis theagenes, also known as the blowhole perch, fusilier sweep, or southern fusilier, is a species of marine ray-finned fish endemic to the southwestern coast of Australia. It is the only species in the genus Caesioscorpis and of the family Caesioscorpididae, the blowhole perches. Its phylogenetic affinities were long uncertain, with it being placed as an indeterminate member of the Serranidae for many decades after its description.