Jaws dialog question...

I figured a fishing group was the best place to ask this one...
In the movie Jaws, Robert Shaw playing the part of Quint delivers one of his
memorable speeches in the town hall meeting. It goes: "Y'all know me.
Know how I earn a livin'. I'll catch this bird for ya, but it ain't gonna
be easy... Bad fish. It's not like goin' down to the pond chasin'
bluegills or something.
Anyone know what that something is? It seems people have different
interpretations of what he said, including "tommycats", tommycots", and
"tommycocks". I've done searches on all three but so far haven't come up
with anything relating to fish. Anyone know what fish he was referring to?
To me it kind of sounds like "tommycats", but it's kind of hard to tell
because in the movie he was sticking a potato chip or something in his mouth
just as he said it.
Thanks for any ideas.
-Kent