The scientific name for kokopu is Galaxias fasciatus. Banded kokopu are only found in New Zealand, where they like small, clean streams and plenty of shade.
Kokopu have been found in both rural and urban streams. In urban areas, banded kokopu can usually be found where the streams are clean and forested, but not in other places where streams are less clean.
Banded kokopu commonly grow to over 200 mm. Adult banded kokopu usually live in very small tributaries where there is an overhead canopy of vegetation.