Fishman smash!

Funny fact: the script actually called for a rather loud growl. Fishmen are notorious for improvisation.

Secret of the ooze

You wouldn't like him when he is angry.

(Yes, I mixed a TMNT reference with an Incredible Hulk reference, I know)

Poke it with a stick

Obviously, the aliens do not give a hoot and continue to pollute.

Cow-Crab

All the fish do is looked shocked