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small fish with large eyes probably the silver perch (ed. note - Bidyanus bidyanus see https://en.wikipedia.org/wiki/Bidyanus_bidyanus image NSW Dept Agriculture with thanks) (ed. note - It is likely that the noun 'purrəkonek' was created from the verb 'purrenga' (to snore). The fish belongs to the 'grunter' family of fish.)