Acanthistius serratus, also known as the western wirrah, is a species of ray-finned fish in the family Serranidae, the groupers and sea basses. The species is native to the Eastern Indian Ocean and is endemic to southern Australia, specifically Western Australia and South Australia.Paxton, J.R., D.F. Hoese, G.R. Allen and J.E. Hanley, 1989. Pisces. Petromyzontidae to Carangidae. Zoological Catalogue of Australia, Vol. 7. Australian Government Publishing Service, Canberra, 665 p.

The fish gets up to in length.

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