Multi-timescale interactions between pink and chum salmon catch per unit effort in the Bering Sea

2017 ◽  
Vol 26 (4) ◽  
pp. 498-506
Author(s):  
Kyuji Watanabe
Keyword(s):  
Bering Sea ◽  
Chum Salmon ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
The Bering Sea

Estimating target strength of young chum salmon (Oncorhynchus keta)

2022 ◽  
pp. 1-5
Author(s):  
Kenji Minami ◽  
Hokuto Shirakawa ◽  
Yohei Kawauchi ◽  
Huamei Shao ◽  
Makoto Tomiyasu ◽  
...  
Keyword(s):  
Bering Sea ◽  
Chum Salmon ◽  
Fork Length ◽  
Target Strength ◽  
Oncorhynchus Keta ◽  
Biomass Estimation ◽  
Fishery Resource ◽  
Chum Salmon Oncorhynchus Keta ◽  
Acoustic Methods ◽  
The Bering Sea

Although chum salmon (Oncorhynchus keta) is an important fishery resource in Japan, acoustic methods cannot be applied to biomass estimation because the target strength (TS) is unknown. This study clarified the TS for each fork length (FL: 5.5–33.5 cm) of young chum salmon inhabiting the Japanese coastal area to the Bering Sea by measuring free-swimming fish. The size dependences of the TS values were TSmean = 20 log10 FL – 68.0, for both 38 and 120 kHz. This facilitated the estimation of biomass of young salmon using acoustic methods.

Nonrandom distribution of chum salmon stocks in the Bering Sea and the North Pacific Ocean estimated using mitochondrial DNA microarray

2009 ◽  
Vol 75 (2) ◽  
pp. 359-367 ◽  
Author(s):  
Shogo Moriya ◽  
Shunpei Sato ◽  
Moongeun Yoon ◽  
Tomonori Azumaya ◽  
Shigehiko Urawa ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Dna Microarray ◽  
Bering Sea ◽  
North Pacific ◽  
Chum Salmon ◽  
North Pacific Ocean ◽  
The North ◽  
Nonrandom Distribution ◽  
The North Pacific ◽  
The Bering Sea

scholarly journals The relationship between pink salmon biomass and the body condition of short-tailed shearwaters in the Bering Sea: can fish compete with seabirds?

2011 ◽  
Vol 278 (1718) ◽  
pp. 2584-2590 ◽  
Author(s):  
Kanako Toge ◽  
Rei Yamashita ◽  
Kentaro Kazama ◽  
Masaaki Fukuwaka ◽  
Orio Yamamura ◽  
...  
Keyword(s):  
Body Condition ◽  
Bering Sea ◽  
Pink Salmon ◽  
The Body ◽  
Oncorhynchus Gorbuscha ◽  
Catch Per Unit Effort ◽  
Study Region ◽  
Top Predators ◽  
The Relationship ◽  
The Bering Sea

Seabirds and large fishes are important top predators in marine ecosystems, but few studies have explored the potential for competition between these groups. This study investigates the relationship between an observed biennial change of pink salmon ( Oncorhynchus gorbuscha ) biomass in the central Bering Sea (23 times greater in odd-numbered than in even-numbered years) and the body condition and diet of the short-tailed shearwater ( Puffinus tenuirostris ) that spends the post-breeding season there. Samples were collected with research gill nets over seven summers. Both species feed on krill, small fishes and squid. Although the mean pink salmon catch per unit effort (in mass) over the study region was not related significantly with shearwater's stomach content mass or prey composition, the pink salmon biomass showed a negative and significant relationship with the shearwater's body mass and liver mass (proxies of energy reserve). We interpret these results as evidence that fishes can negatively affect mean prey intake of seabirds if they feed on a shared prey in the pelagic ecosystem.

Behavior in Salmon

2020 ◽  
pp. 94-112
Keyword(s):  
Bering Sea ◽  
Sockeye Salmon ◽  
Chum Salmon ◽  
Rapid Development ◽  
Open Water ◽  
Masu Salmon ◽  
Upstream Migration ◽  
Typhoon Season ◽  
Lake Toya ◽  
The Bering Sea

The recent rapid development of biotelemetry technologies has made it possible to continuously observe the underwater behavior of salmon in open water. Homing migratory behaviors were studied using anadromous chum salmon from the Bering Sea to Hokkaido and lacustrine sockeye salmon and masu salmon in Lake Toya. Biotelemetry results on the migratory behavior of adult chum salmon in a reconstructed reach of the Shibetsu River; the investigation of cardiac arrest during gamete release in chum salmon; the comparison of the swimming ability and upstream-migration behavior of chum salmon and masu salmon in Hokkaido, Japan; and the analysis of site fidelity and habitat use in Formosan landlocked salmon during the typhoon season in the Chichiawan stream, Taiwan were also performed. This chapter describes the homing migration of anadromous chum salmon from the Bering Sea to Hokkaido, Japan; the homing migration of lacustrine sockeye salmon and masu salmon in Lake Toya, Hokkaido, Japan; and biotelemetry research on various behaviors in salmon.

Genetic Stock Identification of Chum Salmon in the Bering Sea and North Pacific Ocean Using Mitochondrial DNA Microarray

2006 ◽  
Vol 9 (2) ◽  
pp. 179-191 ◽  
Author(s):  
Shogo Moriya ◽  
Shunpei Sato ◽  
Tomonori Azumaya ◽  
Osamu Suzuki ◽  
Shigehiko Urawa ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Dna Microarray ◽  
Bering Sea ◽  
North Pacific ◽  
Chum Salmon ◽  
North Pacific Ocean ◽  
Stock Identification ◽  
Genetic Stock ◽  
Genetic Stock Identification ◽  
The Bering Sea
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