To check if your Nobu miso cod has gone bad, look for a few key signs. First, smell itāfresh cod should have a clean, ocean-like scent. If it smells sour or overly fishy, itās best to discard it. Next, check the appearance. Fresh cod should look bright and moist. If it has gray or brown spots, or seems slimy or dry, it might be spoiled. Also, feel the texture; fresh cod should be firm and springy. If itās mushy or doesnāt bounce back, itās probably bad. Lastly, always check the expiration date. If youāre unsure, itās safer to err on the side of caution and not take the risk. I hope this helps.