In Shia Islam, specifically following the Jafari school of jurisprudence, crab is considered haram (forbidden). This means it is not permissible for Shia Muslims to consume crab.
This aligns with the Jafari school's rulings on other seafood, like lobster. The reference provided clearly states that the Jafari school, the primary school of jurisprudence within Shia Islam, prohibits the consumption of crab.
Therefore, the answer to the question is a definitive yes; crab is haram in Shia Islam according to the Jafari school.
