Yes....if you have a stomach of steel, why would you want to anyway you strange person, fresh mackral like when my dad and i have just caught it is always best
This is something I would be very careful of, seafood is certainly nothing to fool around with. If I were there I would first smell the fish, mackerel could be tough there since it's a strong smelling fish anyways. Check to see if it feels slimy, or if the eyes are clouded over. If it is, it's probably past it's prime and certainly not worth taking a chance on.