Answered by Sidi Mostafa Azzam
As Sheikh Amjad mentioned, animals that are entirely aquatic are permissible to eat (this means whether crabs, lobsters, prawns, sharks, or anything else), except those that are poisonous (or harmful). The impermissibility to which Sheikh Amjad's answer is referring is regarding crabs that do live outside of water (for example, shore crabs and land crabs), as is understood by the word saratan in the Arabic.
As for other crustaceans that live only in water, never have I heard from Sheikh Amjad, or any other Shafi'i, say that they are forbidden.
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