1) The degradation of the islets during the cold storage of fishes varies with the species of fishes. The islets of fishes, e. g. bonito, which migrate in warm currents are not easily degraded during the storage of fishes, while the islets of fishes, e. g. codfish, which live in cold water are destroyed even at 0℃. 2) The islet attached to the gall bladder has a weak membrane, so that it is easily crumbled away during the storage, while the islet found in the mesentery is always encapsulated with connective tissue and can be stored for a long time.
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