Yes, BLUEFISH is a Scrabble word!

Letter values in Scrabble US: B 3, L 1, U 1, E 1, F 4, I 1, S 1, H 4.

Is it a valid word?

BLUEFISH is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

bluish warm-water marine food and game fish that follow schools of small fishes into shallow waters
fatty bluish flesh of bluefish

Also: pomatomus saltatrix.