サラガイ噴射式桁網の漁獲選択性について

概要

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Hydraulic jet dredges are used for catching great northern tellin peronidia venulosa in the Shiriuchi sea area.Considering that the hydraulic jet dredge is a mechanism where the shell does not sift through gaps between teeth and through netting bag just as in the case of dredges most commonly used, selectivity curves for this shell were estimated for the various gaps between the teeth and for the various mesh sizes of netting bag.Size distribution for shells living in the Shiriuchi sea area and efficiency of this dredge were examined based on the catch and size composition data from a dredging survey.It was found that shells living in the Shiriuchi sea area have a density of about 200 per 100m2. However the efficiency of hydraulic jet dredge is influenced considerably by the distance between teeth, the mesh size of netting bag, and the shell size, the average efficiency was about 0.86 for using this dredge.
公益社団法人日本水産学会の論文