摘要:

The fishing grounds of Japan's southwest Pacific Ocean coast are deployed along the narrowest parts of the continental shelf surrounding the Japanese archipelago. The annual catch from bottom trawling is about 60 000 tonnes (1990). This area is strongly influenced by the warm waters of the Kuroshio Current and common species are abundant in the biota of each of the fishing grounds. For this reason Tosa Bay, which is centrally situated among the subject areas, has been chosen as the model area for a survey of the vertical distribution of bottom dwellers. The survey was conducted from 1973 using the trawl nets on the Fisheries Agency survey vessel, Kotaka Maru (47 ton).

ISSN:0091-181X    

DOI:10.1080/10236249209378833

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

First, this paper reviews the main studies so far performed on fishing ground environments and the faunistic peculiarities of demersal animals in the Japan Sea. Next, an examination is made of changes in the catch of demersal populations over a long period. Of the exploited demersal fish populations in the Japan Sea, some have decreased in catch, while others have been relatively stable for a few decades. A comparison of the life history characteristics of flatfishes is carried out on the basis of the above finding. The comparison shows that populations with strong resistance to intensive fishing slow their somatic growth rate and contribute vigorously to reproduction at young ages relative to life span, and vice versa. In addition, a theoretical analysis suggests that the effect of fishing pressure on a population probably depends on the extent of variations in its life history characteristics, which have a genetic basis, in the period when it was little exploited.

ISSN:0091-181X    

DOI:10.1080/10236249209378834

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0091-181X    

DOI:10.1080/10236249209378832

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor