The capture method must be using a single hook. If the angler himself is the store owner, or the store owner can invite the angler to attend in person, even better.
Here's an explanation of single-hook fishing, which is using one hook to catch Bluefin Tuna. The Japanese believe that fish caught with one hook retain their integrity best, thus having higher overall value.
Moreover, a fish caught through single-hook fishing, due to the prolonged battle between the angler and the fish, undergoes a series of changes in its muscles. After appropriate lactic acid removal treatment, the flavor of the fish meat reaches its peak quality.
Methods like using nets or harpoons to catch Bluefin are considered inferior in the eyes of these so-called 'connoisseurs.'
Bruise, external injuries, internal injuries, and even damage to the skin, all decrease the overall quality of the Golden Spearfish.
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