What is the rarest sea creature in Animal Crossing?

Chef's answer
Spider CrabThe Spider Crab is a rare deep-sea creature with a huge shadow. It is fast and extremely difficult to catch. Players can find it any time of day or night, but it appears most frequently during the day between 4 a.m. and 9 p.m. In the Northern hemisphere, it is available from March through the end of April.
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