octopus

Q: I was aware that seafood is halaal. Keeping that in mind, I ate squid, octopus and mussels. When I researched later, I found out it is not halaal. Could you please confirm whether it was halaal or not? If it is not, how can I repent? This action was done unintentionally.

Q: The Quraan states that all underwater creatures are Halaal for Muslims. But, some Moulanas say that shark, crab and octopus are excluded. Is this correct or can we Muslims freely consume all underwater creatures?

Q: Why we are not allowed to eat prawns, crab and octopus?