scholarly journals A LONG-TERM DYNAMICS OF FISH RESOURCES IN THE PACIFIC OCEAN WATERS OFF THE NORTHERN KURIL ISLANDS FOR THE PERIOD 1987–2015

2019 ◽  
pp. 174-187
Author(s):  
Keyword(s):  
Pacific Ocean ◽  
Kuril Islands ◽  
Fish Resources ◽  
The Pacific ◽  
Northern Kuril Islands ◽  
The Pacific Ocean ◽  
The Northern Kuril Islands

scholarly journals Long-term ocean acidification trends in coastal waters around Japan

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hiroshi Ishida ◽  
Ryosuke S. Isono ◽  
Jun Kita ◽  
Yutaka W. Watanabe
Keyword(s):  
Pacific Ocean ◽  
Ocean Acidification ◽  
Sea Of Japan ◽  
Ocean Current ◽  
The Sea Of Japan ◽  
Marginal Seas ◽  
The Pacific ◽  
Activity Measurements ◽  
The Pacific Ocean

AbstractThis study examines long-term ocean pH data to evaluate ocean acidification (OA) trends at two coastal research institutions located on the Sea of Japan and the Pacific Ocean. These laboratories are located away from the influences of large rivers and major industrial activity. Measurements were performed daily for the past 30 years (1980s–2010s). The average annual ocean pH for both sites showed generally negative trends. These trends were – 0.0032 and – 0.0068 year–1 (p < 0.001) at the Sea of Japan and Pacific Ocean sites, respectively. The trends were superimposed onto approximately 10-year oscillations, which appear to synchronize with the ocean current periodicity. At the Sea of Japan site, the ocean pH in the summer was higher, and the rate of OA was higher than during other seasons. Our results suggest that seasonality and ocean currents influence OA in the coastal areas of open oceans and can affect the coastal regions of marginal seas.

scholarly journals Pacific Sea Levels Rising Very Slowly and Not Accelerating

2019 ◽  
Vol 38 (1) ◽  
pp. 179-184 ◽  
Author(s):  
Albert Parker ◽  
Clifford Ollier
Keyword(s):  
Pacific Ocean ◽  
Sea Level ◽  
Relative Rate ◽  
Tide Gauges ◽  
Sea Levels ◽  
The Past ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Long Term Trend

AbstractOver the past decades, detailed surveys of the Pacific Ocean atoll islands show no sign of drowning because of accelerated sea-level rise. Data reveal that no atoll lost land area, 88.6% of islands were either stable or increased in area, and only 11.4% of islands contracted. The Pacific Atolls are not being inundated because the sea level is rising much less than was thought. The average relative rate of rise and acceleration of the 29 long-term-trend (LTT) tide gauges of Japan, Oceania and West Coast of North America, are both negative, −0.02139 mm yr−1and −0.00007 mm yr−2respectively. Since the start of the 1900s, the sea levels of the Pacific Ocean have been remarkably stable.

Biology and Management of Dogfish Sharks

2009 ◽  
Keyword(s):  
Kuril Islands ◽  
Spiny Dogfish ◽  
Depth Range ◽  
Southeastern Kamchatka ◽  
Pacific Waters ◽  
The Pacific ◽  
Body Weights ◽  
Northern Kuril Islands ◽  
Catch Rates ◽  
The Northern Kuril Islands

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.

Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries

2008 ◽  
Keyword(s):  
Stock Assessment ◽  
Kuril Islands ◽  
Southeastern Kamchatka ◽  
The Pacific ◽  
Vertical Distributions ◽  
Northern Kuril Islands ◽  
Different Seasons ◽  
By Catch ◽  
Catch Rates ◽  
The Northern Kuril Islands

<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.

Thermal limits and ocean migrations of sockeye salmon (Oncorhynchus nerka): long-term consequences of global warming

1998 ◽  
Vol 55 (4) ◽  
pp. 937-948 ◽  
Author(s):  
D W Welch ◽  
Y Ishida ◽  
K Nagasawa
Keyword(s):  
Pacific Ocean ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Step Function ◽  
Thermal Limits ◽  
The North ◽  
The Pacific ◽  
Different Temperatures ◽  
The Pacific Ocean

Ocean surveys show that extremely sharp thermal boundaries have limited the distribution of sockeye salmon (Oncorhynchus nerka) in the Pacific Ocean and adjacent seas over the past 40 years. These limits are expressed as a step function, with the temperature defining the position of the thermal limit varying between months in an annual cycle. The sharpness of the edge, the different temperatures that define the position of the edge in different months of the year, and the subtle variations in temperature with area or decade for a given month probably all occur because temperature-dependent metabolic rates exceed energy intake from feeding over large regions of otherwise acceptable habitat in the North Pacific. At current rates of greenhouse gas emissions, predicted temperature increases under a doubled CO2 climate are large enough to shift the position of the thermal limits into the Bering Sea by the middle of the next century. Such an increase would potentially exclude sockeye salmon from the entire Pacific Ocean and severely restrict the overall area of the marine environment that would support growth.

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