scholarly journals The 25 March 2020 M 7.5 Paramushir, northern Kuril Islands earthquake and major (M ≥ 7.0) near-trench intraplate compressional faulting

2021 ◽  
Vol 556 ◽  
pp. 116728
Author(s):  
Lingling Ye ◽  
Thorne Lay ◽  
Hiroo Kanamori
Fisheries ◽  
2020 ◽  
Vol 2020 (4) ◽  
pp. 44-51
Author(s):  
Aleksandr Zolotov ◽  
Nikolay Antonov ◽  
Olga Maznikova

The paper analyzes the long-term dynamics of stocks and annual catches of Pacific cod of the Kuril Islands, and also considers the structure of its modern fishery, taking into account the changes that have occurred in the organization of its coastal fishing in recent years. It was shown that the dynamics of commercial biomass of Pacific cod in the Northern and Southern Kuril Islands is comparable to that in 1975-2020 for groups in the southeastern part of the Bering Sea, the Karagin and Olyutor bays, on the shelf of Western Kamchatka, and in south-western Sakhalin. Development of the cod fishery in the North and South Kuril Islands in 1980-2019 went in accordance with the dynamics of stocks, the maximum catches were observed during the period of a high level of abundance of both groups in the 1980s. While the structure of the cod fishery on the shelf of the Northern Kuril Islands to date can be considered established, the development of fishing in the South Kuril Islands in the last two decades went by the gradual replacement of trawl fishing in the winter-spring period with snorkeling in the summer season.


Abstract.—Spiny dogfish <em>Squalus acanthias </em>are occasionally caught by bottom trawls in the Pacific waters off the northern Kuril Islands and southeastern Kamchatka. Only 23 specimens were captured during 8 years of commercial and research cruise observations from 1993 to 2000. This species occurred most frequently off the southeastern coast of Kamchatka within a depth range of 200–300 m and a bottom temperature range of 2°–3°C. In the study area, this shark was represented by specimens with total lengths of 54–85 cm (69.2 cm average) and body weights of 1–3 kg (1.8 kg average). Dogfish were captured in the Pacific waters off the northern Kuril Islands and southeastern Kamchatka from July to December. Maximum catch rates occurred in November and were probably related to southward migrations.


<em>Abstract</em>.—The giant grenadier <em>Albatrossia pectoralis </em>and popeye grenadier <em>Coryphaenoides cinereus </em>are among the most abundant continental slope fish species of the North Pacific. Their high biomass constitutes about 2 million metric tons and they comprise a large portion of by-catch in deepwater bottom trawl and longline fisheries. However, these species are mostly discarded and their specialized fisheries are currently only in the initial stage. The ecology and biology of giant and popeye grenadiers in the Pacific off the northern Kuril Islands and southeastern Kamchatka are still poorly understood. This paper is based on results of studies conducted in 1992–2002 aboard Japanese trawlers in the Pacific waters off the northern Kuril Islands and southeastern Kamchatka. It describes seasonal changes of spatial and vertical distributions and bottom temperature preferences, provides data on their lengths and weights, length-weight relationships, sex ratios, and multi-annual, seasonal, and diurnal variations of catch rates. Relationships between mean body weight and capture depth are presented for different seasons. Data on composition of species co-occurring in catches are given for both grenadiers in respect to different times of year.


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