Gadopsis is a genus of temperate perches endemic to freshwater habitats in southeastern Australia.

There are some grounds for believing[citation needed] blackfish may be a smaller version of Murray cod, inhabiting similar niches but in habitats are too small for Murray cod (having said this, their distributions originally overlapped substantially), and there are grounds for believing that blackfish and Murray cod have drawn heavily on common genes at the family level.

[5] Blackfish have a recruitment method similar to Murray cod, but with more specialisation to upland habitats.

Upon hatching the larval blackfish are, uniquely, attached to their ruptured egg case by a tether until the yolk sac is largely used and the larvae are ready to commence exogenous feeding.

(This unique structure is presumably an adaptation to upland river/stream habitats, to prevent larvae being swept away in currents.)