Yes, All fishes are halal (permissible) to consume. All kinds of fishes are (halal) permissible to consume, whether they are alive or dead.
It is clearly mentioned in the Holy Quran:
“Lawful to you is game from the sea and its food as provision for you and the travellers, but forbidden to you is game from the land as long as you are in the state of ihram. And fear Allah to whom you will be gathered.”-(The Quran 5:96).
Ibn ‘Abbaas (ra) said:
“ Sayduhu (lit. hunting, pursuit) refers to whatever is taken from it alive, and ta’aamuhu (lit. its food) means whatever is taken dead.”