Having studied Czech, I hope I know all the sounds. ;-}

Here's my attempt at a translation:

THE FISHERMAN

1. I am the fisherman that roams the water.
I am the fisherman, I know the water.
I sit in my boat, I go after a girl;
on the other side I'll get her.

[Chorus]
Brum-ty brum-ty brum-ty, tra lala la, (3x)
tra la la lala la la la la.

2. When they go fishing our lake,
when they go fishing our pond,
I'll go there, too, I'll angle for fish,
I'll catch a pike: slap! right in the bag.

I believe the word "ten" in the first two lines conveys a boastful cast, like "I'm a fisherman, you bet" or "I'm a real fisherman".

I should have a MIDI for this soon.