Caligus infestans is a species of sea louse in the family, Caligidae, first described by Camill Heller in 1865.[1] [2]
In Australia it is found as an ecto-parasite (a parasite living on the outside of its host) of fishes at depths of 200 metres in the following IMCRA zones - Central Eastern Shelf Transition (39), Northeast Shelf Province (40), and the Northeast Shelf Transition - that is, in seas off the north east coast of Australia.
A search of the Smithsonian Invertebrates Collection[3] reveals they have also been found off:
and Madagascar and Mozambique (all with the same host).