scholarly journals Challenges to Improving the Chum Salmon Hatchery Program in Kitami Region, Hokkaido

2021 ◽  
Author(s):  
Yasuyuki Miyakoshi
Keyword(s):  
Chum Salmon ◽  
Salmon Hatchery ◽  
Hatchery Program

Importance of Estuarine Residence for Adaptation of Chum Salmon (Oncorhynchus keta) Fry to Seawater

1984 ◽  
Vol 41 (5) ◽  
pp. 744-749 ◽  
Author(s):  
Munehico Iwata ◽  
Shichiko Komatsu
Keyword(s):  
Surface Layer ◽  
Brackish Water ◽  
Chum Salmon ◽  
Oncorhynchus Keta ◽  
Otsuchi Bay ◽  
Chum Salmon Oncorhynchus Keta ◽  
Salmon Fry ◽  
Seaward Migration ◽  
Subsequent Exposure ◽  
Salmon Hatchery

Within 24 h after release from the Otsuchi Salmon Hatchery in Japan, most chum salmon (Oncorhynchus keta) fry migrated the 1.7 km and were found in the surface layer (10–15‰ salinity) of the estuary. No fish were seen in the underlying seawater. Many fry remained in the brackish water for 2 d before migrating seaward. Plasma Na concentrations increased gradually from 134 to 156 mmol/L during seaward migration from the river to Otsuchi Bay. When fry were acclimated to one-third seawater for 3 and 6 h and then transferred to seawater, the Na concentration of the fry increased maximally to 161–172 mmol/L within 12 h. When they were acclimated to one-third seawater for 12 h, the Na concentrations reached the seawater-acclimated level without showing any peak; subsequent exposure to seawater did not cause any further change in plasma Na. Acclimation to isotonic estuary water for 12 h is thus sufficient for efficient adaptation of chum salmon fry to seawater.

Patterns of Gravel Scour and Fill after Spawning by Chum Salmon in a Western Washington Stream

2000 ◽  
Vol 20 (3) ◽  
pp. 610-617 ◽  
Author(s):  
Dave E. Schuett-Hames ◽  
N. Phil Peterson ◽  
Robert Conrad ◽  
Thomas P. Quinn
Keyword(s):  
Chum Salmon ◽  
Western Washington

scholarly journals Age determination of chum salmon using scales and otoliths

2017 ◽  
Vol 83 (5) ◽  
pp. 758-763
Author(s):  
YURIKO KANETO ◽  
SATOSHI KATAYAMA ◽  
MASAYA IIDA
Keyword(s):  
Chum Salmon ◽  
Age Determination

Infection of oomycetes and bacteria associated with their specific colocalization in chum salmon eggs

Aquaculture ◽  
2021 ◽  
pp. 737244
Author(s):  
Sakiko Orui Sakaguchi ◽  
Tetsuro Ikuta ◽  
Akihiro Tame ◽  
Yuichi Shimizu ◽  
Kiyotaka Takishita ◽  
...  
Keyword(s):  
Chum Salmon ◽  
Salmon Eggs

Supplementary Checks on the Scales of Pink Salmon (Oncorhynchus gorbuscha) and Chum Salmon (O. keta)

1965 ◽  
Vol 22 (6) ◽  
pp. 1477-1489 ◽  
Author(s):  
H. T. Bilton ◽  
W. E. Ricker
Keyword(s):  
British Columbia ◽  
Chum Salmon ◽  
Pink Salmon ◽  
Oncorhynchus Gorbuscha ◽  
Commercial Fisheries ◽  
Pink Salmon Oncorhynchus Gorbuscha ◽  
Clear Cut ◽  
Second Year Of Life ◽  
Second Year ◽  
Similar Incidence

Among 159 central British Columbia pink salmon that had been marked by removal of two fins as fry and had been recovered in commercial fisheries after one winter in the sea, the scales of about one-third showed a supplementary or "false" check near the centre of the scale, in addition to the single clear-cut annulus. This evidence from fish of known age confirms the prevailing opinion that such extra checks do not represent annuli, hence that the fish bearing them are in their second year of life rather than their third. Unmarked pink salmon from the same area, and some from southern British Columbia, had a generally similar incidence of supplementary checks. In both marked and unmarked fish the supplementary checks varied in distinctness from faint to quite clear. In a sample of scales of 14 double-fin marked chum salmon which were known to be in their 4th year, all fish had the expected 3 annuli, and 12 fish had a supplementary check inside the first annulus.

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