Couldn't find what this word means. Something about sea species?

[Turnipbag]

Couldn’t find what this word means. Something about sea species?

[SanneT]

What a challenge. I can only agree with you: marine mouse species?? Not very likely, I fear. Oh, it could be a kind of water rat, couldn’t it?

[Deahna]

It’s a species of fish; see here: Havsmusartade fiskar – Wikipedia

[Turnipbag]

Thanks guys!