bleeding fish will prevent the blood to seep into the flesh as it breaks down (better than saying decomposes). Offshore fish (macks, blues, tuna and sharks) have blood that is different from the blood of inshore fish. The offshore fish are always on the move, so their blood designed to hold more O2 and rid their muscles of lactic acid more quickly to allow them to swim longer and faster than inshore fish. Although inshore fish don't have the same type of blood you will benefit just the same by bleeding them.
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