 Fewer than 65 native fish species occur in the lake basin, but more than half of these are endemic.The families Abyssocottidae (deep-water sculpins), Comephoridae (golomyankas or Baikal oilfish), and Cottocomephoridae (Baikal sculpins) are entirely restricted to the lake basin.All these are part of the Cottoidea and are typically less than long.