The meat of the lingcod naturally has a blue greenish meat

Like Smurfs. How do Smurfs taste you 're asking? Like chicken, I guess. Practically all exotic meat is said to taste like that.

The lingcod at the restaurant I work at comes in white already, not blue like this. And it’s not frozen either.

from wiki
Around 20% of lingcods have blue-green to turquoise flesh. The colour is destroyed by cooking.[ The colour may be due to biliverdin, but this has not been established beyond doubt.
yes i know direct quoting from wiki is lazy but it is friday-afternoon