Red Snapper

Source
This item can be fished from a School of Red Snapper, and drops from Angry Murlocs. It is fished with a Draenei Fishing Net provided for the quest, not with a fishing pole, and does not require the fishing skill to fish. The net is used while standing or swimming in a School of Red Snapper, and either catches a single Red Snapper or occasionally spawns a hostile Angry Murloc mob, which always drops a Red Snapper when defeated.

As a quest objective
This item is an objective of Red Snapper - Very Tasty! (ten required).

Trivia
This fish may be an homage to the character Kuni's line, "Red snappah, very tasty!", from the movie, ; in turn referenced by Oxhorns machinama "Red snappah, very tasty!"

In any case, is very much a popular real world fish.