Giant bully

The giant bully (Gobiomorphus gobioides), tītarakura, or tīpokopoko (Māori), is a species of fish in the family Eleotridae endemic to New Zealand.

Description
This is the largest species of bully and it can reach more than 25 cm in length, but most are 12 - 15 cm. Adults are generally found near the coast in freshwater, tidal or estuarine habitats. The breeding behavior is poorly known, but the species is considered diadromous and it is suspected that the larvae spend time in the sea.

It is very similar to the common bully (which can reach up to 15 cm), but it has six dorsal spines, where the common bully usually has seven.