The parts of an ocean creature we're eating regularly inhabit temperatures simply above freezing, so does the "stuff" that enables the body of the creature to work. On the off chance that you put an issue with in the refrigerator, the "stuff" (compounds) simply close down, where as though you place fish in the fridge, the proteins are proceeding to work at the lower temp. bacteria can bolster off the separating of the chemicals/bio item since they're as yet dynamic.