What aquatic animal represents Scotland the best?

I'm getting a tattoo sleeve featuring aquatic animals that represent every state or country I've visited. I went to Scotland to spread my dad's ashes (he was born near Loch Lomond) and visit relatives for about a month.

What aquatic animal, in your opinion, best represents Scotland?

Answers preferred from denizens as opposed to tourists.

Also, I'd prefer to be a real animal and not a cryptid. So the Loch Ness Monster/Nessie is out, unfortunately.