Is the yellow stuff in crabs poop?

Chef's answer
mustard Yellow substance found inside a cooked crab. Contrary to popular belief, the "mustard" is not fat, rather it's the cras hepatopancreas, the organ responsible for filtering impurities from the cras blood. The parts of the crab that are inedible include the shell, lungs and stomach..
Frequently asked Questions 🎓
For the crab to grow larger, it molts, or sheds its shell periodically. A molting crab is said to be a "soft-shell." Mustard: Yellowy substance found inside a cooked crab. ... She-crab: An immature female crab, also known as a "Sally.".
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