Hi @abudar,
Crab sup that look very delicious ,,
about eating crabs there are many differences of opinion, some say the law mubah (maybe), some say makruh and some say haram ,, one of the scholars kharismatik aceh said that the law of crab is haram, crab live in the ponds or crabs, they forbid it because it is equivalent to a frog .. but there is also a legal crab that is kosher, that is sea crab .. because there is a proposition stating that all marine animals Law is halal, except those who live two places and have kemudharatan to body ..
that's my comment ..
hopefully knowledge for us all.