Usage patterns
〈人〉が蟹を捕るto catch crab
The kids were playing catching crabs by the sea.
蟹の甲羅を剥くto remove the shell of a crab
I removed the crab's shell to take out the meat.
蟹鍋にするto make crab hot pot
I think I'll make crab hot pot tonight.
Expressions
月夜の蟹crab with little meat; crab of a moonlit night · something with no substance; all show and no substance 蟹は甲羅に似せて穴を掘るto each their own; different strokes for different folks; cut your coat to suit your cloth