Tibari

 was fish-like humanoids who had a war with the Xantha. (AUDIO: Fear of the Daleks)

Biology
They evolve from fish transplanted from the Earth.

History
50 years before the Second Doctor, Jamie McCrimmon and Zoe Heriot, landed on Lavonia, the Xantha Empire invaded Tibari prime and started a war. (AUDIO: Fear of the Daleks)