I'm trying to find them, but it's not a common song, and I've lost touch with the guys who who sang it.
Probably a vaudeville song.
The verse that I remember, or an amalgam thereof, is...

In the good old steamboat days,
In the good old steamboat days,
Times(back then?) were mighty queer,
boats would make about a mile a year!
The fish ate rats and cats,
and they all were acrobats,
they stood on their heads to wet their gills
In the good old steamboat days,
in the good old steamboat days!
Thanks, Chris.