The Atlantians have to be vegetarians, hear me out!
I was on the subjects of Auquaman throwing a feast/banquet (don't ask how I got there my thought process is very screwed up) and I was wondering, what would they eat.
Because, Auquaman rules over the ocean, right? So that makes marine animals apart of his subjects and he couldn't eat them. But he also can't bring down surface food cause it would corrode or float apart. (Have you ever seen food under water, gross.)
So what would they eat? Plankton? I don't think so.
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