English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

According to the study on the deep-sea drag-net fishery which was operated in the depth of 100-500m of the Seas of Kumano and Ensyu already exploited grounds, the following results were obtained (1) The fishing effort of this fishery had increased rapidly after the period of reduced fishing in the wartime and then has become almost constant since 1949. 2) The average daily catch per boat, however, had decreased considerablly as the fishing effort had increased and became almost constant in the three years (Sep. 1951-May 1954). The results of the re??earches carried out in a new ground off Tokusima and Wakayama Prefecture from Mar. 1953 to Feb. 1954 showed that the species of the catches were all the same to those of the old grounds and the the average daily catch per boat of the new ground was much superier to that of the old grounds at present and even superior to that of the old grounds soon after the war. Supposing that the average production per unit a??ea in the new ground is equal to that in the old ones, the number of the boats to be admited to the fishing in the new ground may be estimated at 40-46, with the aid of the extents of the new and old grounds and the number of the boats in the old ground, where the equilibrium between the fishery and its stock is supposed to be established, since both the fishing effort and the average catch are almost constant in the three years.

On the Deep-Sea Drag-Net Fishery on the Pacific Coast of Middle Japan, Especially on the New Ground