I don't think those chords are correct. I recall it as a minor variation on 12-bar blues. Something like this:
F
I'm going fishin...
Bb
Won't you come fishin' too?
F
Bet your life...
G7 C
Catch more fish than you
F
Any fish bite...
F7
If you got good bait
Bb
Here's a little somethin...
F
Anyfish bite...
C
I'm a going fishin too