A species of large fish found in Australian rivers WordNet 3.0

A species of large fish found in Australian rivers, it has several reddish spots in a crescent shape on each scale (Scleropages jardinii) Open English WordNet

Scleropages jardinii, the Gulf saratoga, Australian bonytongue, Pearl arowana or northern saratoga, is a freshwater bony fish native to Australia and New Guinea, one of two species of fishes sometimes known as Australian arowana, the other being Scleropages leichardti. Wikipedia