Keep mullet cool on the trip from the market to your house. Never let it stay unrefrigerated for long. To store mullet, remove packaging, rinse fish under cold water, and pat dry with paper towels. Fish deteriorates when it sits in its own juices, so place it on a cake rack in a shallow pan filled with crushed ice. Cover with cling wrap or foil and set in the coldest part of the refrigerator. Mullet will store well this way for up to two days. To freeze mullet, first remove the dark layer of flesh running along the midline of both sides. This dark flesh does not keep well. When well-wrapped, mullet can be frozen for up to two months in a refrigerator freezer and for three to four months in a deep-freeze. Use lined freezer paper, and wrap fish tightly from head to tail with at least two layers of paper. To thaw slowly, unwrap, place fish in pan, cover, and leave for 24 hours in the refrigerator. To thaw more quickly, place the whole fish (wrapped in a watertight bag) in a sink with cool running water, allowing about 30 minutes per pound (about 454g). For fastest thawing, use the defrost cycle of your microwave, allowing 2 to 5 minutes per pound, with equal standing time in between zaps (as one minute defrost to one minute resting).