Growing up, whenever we went to the fish market, esp in Karwar, my dad would always show us all the different fishes, and even though other people ate some of the more exotic looking ones like sting rays, sharks, crabs etc, we knew we didn't eat it because they weren't halal. Once, our neighbour, a Muslimfrom Kerala who spoke very confusing Hindi, brought us a delicious smelling pilau. My dad though refused, saying the mussels in there were ones we coudn't eat. I protested saying they were also Muslims, so it must be halal. But he didn't budge. We didn't eat it. There are many Muslims who consume crabs, snails, flatfishes, and others sea food, and I don't know, but I would like to trust my dad. He says that for centuries we haven't touched those because of certain rules, so how can we eat it now.