So in Slovenian it is a »marine dog«? - I remember as a kid there was an R/C toy submarine in the form of a mini shark. That would sour the pond-experience for the ducks...In the Slovenian language the literal "sea dog" is "morski pes" which is a shark. Maybe that's a good thought as well but... I'm guessing ducks are not familiar with sharks in the first place and it could be more of an attraction than a threat.
