Catch and Fish-loss Model for Vertical Longline Fishing with Particular Emphasis on Injury of Unharvested Fish

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  • Catch and Fish-loss Model for Vertical

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Underwater fish loss in vertical longline fishing was assessed with emphasis on injury of unharvested fish. Two series of experimental fishing were conducted in tropical deep water. The capture process was statistically modeled and ratios of contact, hooking and fish-loss, which includes escape of hooked fish and breaking branch lines, were found to depend on the gear-soaking time orhook height from the sea bed. A simulation using a model estimated that fish loss was 1.07 times morethan the catch when the tested line maximized the catch under the tested condition. The fish-loss/catch ratio increases rapidly with longer soaking of the gear. To reduce fish loss, vertical longlines with fewer hooks at short vertical intervals must be used to maximize the catch at a short soaking. In richerfishing grounds, the optimum soaking period is shorter, the catch per line increases and fish loss decreases, therefore, only a small number of lines is needed to maximize the catch. The development of fishing with an increasing number of hooks may accelerate fish loss as resources dwindle. The technical transfer of longlining to developing countries whose fishing grounds are mostly under-developed must be reevaluated.

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