Metriaclima greshakei (M. K. Meyer & W. Förster, 1984) Pseudotropheus greshakei M. K. Meyer & W. Förster, 1984 William's mbuna (Maylandia greshakei), also known as ice blue zebra mbuna or ice blue zebra or the Pseudotropheus ice blue among the aquarium enthusiasts, is a species of cichlid fish endemic to Lake Malawi where it is only found at Makokola in the southeastern arm of the lake.

This species can reach a length of 13.4 centimetres (5.3 in) TL.

It can also be found in the aquarium trade.

[2] The specific name honours the German ornamental fish importer Alfons Greshake.

This Cichlidae-related article is a stub.