I don't like eating any animal that live under the water. Fish, crustacean, molluscs. Nope. All gross. I will eat them if I have to, but there's almost never any great joy in doing so. Really fresh sashimi and well seasoned seafood dishes I do occasionally enjoy, but most of the time I'd rather go for something else if there's a choice.
Underwater plants are a-okay. Seaweed is delicious. And fuck Brad's opinion on jellyfish. They're great. Soak them in a sauce made from vinegar (not that transparent white vinegar bullshit, real dark Chinese vinegar or bust) and sugar, leave them in the fridge for one night, then put a dash of sesame oil on and mix before eating. So good. It's all about picking good quality jellyfish. Fuck that up, the whole thing's garbage.
And I realize jellyfish are animals and not plants. That's how good they taste to me.