岩手県沿岸水域における養殖ワカメ収穫量と天然ワカメ収穫量との関係
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概要
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In Iwate Prefecture, the harvests of marine algae, especially brown algae is most significant as representative of the inshore fisheries. An attempt, has been made by using the annual statistics on “wakame” harvest, Undaria pinnatifida, to clear the composition of harvests by cultivation and from natural beds in Iwate Prefecture. The harvest data use were for the periods from 1963 to 1972. The analysis showed an evident negative relation between harvest by cultivation and that from natural beds or the number of the equipments use in the cultivation. The equipment, anchored by concrete blocks on the sea bed, consists of the cultivating ropes extended in upper layer of the sea. The upper limit of the total length of the cultivating ropes used in the prefecture was estimated to be 6-7 million meters. The decrease in the harvests from natural beds may be caused by the shifting of the cultivating ground fom the natural habitats of “wakame”.