Movement of juvenile walleye pollock, Theragra chalcogramma, from a spawning ground to a nursery ground along the Pacific coast of Hokkaido, Japan

2004 ◽  
Vol 13 (s1) ◽  
pp. 84-98 ◽  
Author(s):  
SATOSHI HONDA ◽  
TATSUKI OSHIMA ◽  
AKIRA NISHIMURA ◽  
TSUTOMU HATTORI
Keyword(s):  
Pacific Coast ◽  
Walleye Pollock ◽  
Theragra Chalcogramma ◽  
Nursery Ground ◽  
Spawning Ground ◽  
Walleye Pollock Theragra Chalcogramma ◽  
The Pacific

scholarly journals Distribution and habitat conditions of walleye pollock Theragra chalcogramma at southern Kuril Islands

2021 ◽  
Vol 201 (2) ◽  
pp. 340-358
Author(s):  
S. L. Ovsyannikova ◽  
E. E. Ovsyannikov ◽  
Yu. V. Novikov
Keyword(s):  
Walleye Pollock ◽  
Kuril Islands ◽  
Tidal Mixing ◽  
Theragra Chalcogramma ◽  
Intermediate Water ◽  
Habitat Conditions ◽  
Walleye Pollock Theragra Chalcogramma ◽  
The Pacific ◽  
Pacific Side ◽  
Benthic Front

Data on spatial distribution and habitat conditions are presented for walleye pollock Theragra chalcogramma at southern Kuril Islands in spawning season (spring 2015) and feeding season (summer 2016). In spring, walleye pollock are distributed over the entire shelf and continental slope down to 900 m depth and occupy the upper layer on the shelf and intermediate layer at the slope with water temperature 0.1–1.5 o C. In summer, they aggregate at the depth of 200–270 m beyond the shelf in the intermediate water at the Pacific slope of Iturup Island, under the temperature of 1.3–2.9 o C. Both spatial and bathymetric migrations of pollock are minimal at the Pacific side of Iturup, but they migrate for spawning westward and southwestward to the Okhotsk Sea and slope of Small Kuril Ridge where concentrate at the benthic front between the tidal mixing zone and the Intermediate water. Seasonal redistribution of walleye pollock is accompanied with changes of size-age structure in the main aggregations.

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