Black flounder
The black flounder (Rhombosolea retiaria), also known by the Māori language name mohoao, is a flatfish of the genus Rhombosolea, found around New Zealand in shallow enclosed waters and coastal freshwater lakes. Its adult length ranges from 20 to 45 cm.

Description

Rhombosolea retiaria is known for its black back and orange spots.

Habitat

Rhombosolea retiaria is the only species of flounder in New Zealand that can thrive in freshwater. It can be found in streams as far as  inland from the ocean.

References

 
 
 Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand,  (William Collins Publishers Ltd, Auckland, New Zealand 1982) 

black flounder
Endemic freshwater fish of New Zealand
black flounder