It says something about my inability to learn languages that I looked back at my notes from the last time I took Japanese, about a year and a half ago, and I have no idea what half the stuff I wrote means any more. Damnit, languages, why must you mock me D:?
I did make a minor break-through on the crab-thing, though, in finally managing to identify that they're poikilotherms. Found one article that might be helpful, except that while the library webpage claims we have an online subscription to the journal it was in, we apparently don't, because it keeps asking me for login info. If someone else has access and would like to e-mail me the PDF, I'd be eternally grateful - link is here.
EDIT: Skuld sent me a copy - thanks ♥