Maws

Maws are a type of Salmonid that appear in Salmon Run in.

They attack by leaping mouth-first out of the ink, splatting Inklings in their path. Maws move fast enough to keep up with swimming inklings, and their attack is an insta splat, so this fish should be taken care of, and fast!

Trivia

 * Maws seem to have fishing gear with them, if you look at one that has popped up.