Never had that happen during the smoking evolution. Looks like spoiled meat. How long has it been since removed from ocean or freezer? Brine and reefer would suppress but not prevent spoilage...mine is out of freezer or ocean no more than 36-48 hours before smoked, consumed, or frozen. If this is store bought, who knows how long they've let it "sit"....also, ambient temps will make a difference in allowing spoilage both in and out of the reefer. Mold can be cut out and meat salvaged, spoilage is nothing to gamble with...