Abstract
The outer shelf of Funka Bay, located at the bay head of Hidaka Bay, is a recognised main winter spawning ground for walleye pollock (Theragra chalcogramma), whose newly hatched juveniles migrate eastward along the Hidaka shelf to the nursery ground located in the Doto area. To examine the seasonal change of the coastal current along this migration route, four current moorings were deployed along the shelf in Hidaka Bay from April, 2004 to June, 2006. Since these mooring sites were close to the coast, the circulation was estimated after removal of the wind-driven component. It was found that the winter coastal flow, forced by a north-westerly monsoon wind, is clockwise along the Hidaka shelf. However, this flow is weak due to the superimposition of the opposite Coastal Oyashio flow trapped on the shelf. In summer, a bifurcation of the coastal current occurs along the north-eastern Hidaka shelf with a south-eastward flow, associated with the Tsugaru Gyre, and a north-westward flow, consisting of a branch from this gyre. Our results provide a new understanding of the migration of juvenile walleye pollock: (1) very slow transport of juveniles along the Hidaka shelf from winter to spring, and (2) selection of earlier spawning survivors due to the bifurcated flow in early summer.
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References
Csanady, G. T. (1982): Circulation in Coastal Ocean. Reidel Pub. Co., 279 pp.
Emery, W. J. and R. E. Thomson (2001): Data Analysis Methods in Physical Oceanography. Elsevier, Amsterdam, 638 pp.
Honda, S., T. Oshima, A. Nishimura and T. Hattori (2004): Movement of juvenile walleye pollock, Theralgra chalcogramma, from a spawning ground to a nursery ground along the Pacific coast of Hokkaido, Japan. Fish. Oceanogr., 13, 84–98.
Isoda, Y. (1993): Generation mechanism of higher mode nondispersive shelf waves by wind forcing. J. Oceanogr., 49, 535–549.
Ito, S., H. Sugisaki, A. Tsuda, O. Yamamura and K. Okuda (2004): Contributions of the VENFISH program: mesozooplankton Pacific saury (Cololabis saira) and walleye pollock (Theragra chalcogramma) in the northwestern Pacific. Fish. Oceanogr., 13, 1–9.
Kuroda, H., Y. Isoda, M. Onishi, M. Iwahashi, C. Satoh, T. Nakayama, T. Ito, K. Iseda, K. Nishizawa, S. Shima and O. Togawa (2003): 10-, 25-, and 60-day periodic current variations on the western shelf in Hidaka Bay. Oceanogr. Japan, 12, 195–214 (in Japanese with English abstract).
Kuroda, H., Y. Isoda, H. Takeoka and S. Honda (2006): Coastal current on the eastern shelf of Hidaka Bay. J. Oceanogr., 62, 731–744.
Miyake, H., H. Yoshida and Y. Ueda (1996): Distribution and abundance of age-0 juvenile walleye pollock, Theralgra chalcogramma, along the Pacific coast of southeastern Hokkaido, Japan. NOAA Tech. Rep. NMFS, 126, 3–10.
Nakatani, T. and T. Maeda (1981): Transport process of the Alaska Pollock eggs in Funka Bay and the adjacent waters, Hokkaido. Bull. Japan. Soc. Sci. Fish., 47, 1115–1118.
Nakatani, T. and T. Maeda (1984): Thermal effect on the development of walleye Pollock eggs and their upward speed to the surface. Bull. Japan. Soc. Sci. Fish., 50, 937–942.
Nakatani, T. and T. Maeda (1987): Distribution and movement of walleye Pollock larvae Theragra chalcogramma in Funka Bay and the adjacent waters, Hokkaido. Nippon Suisan Gakkaishi, 53, 1585–1591.
Nishimura, A., T. Hamatsu, K. Yabuki and O. Shida (2002): Recruitment fluctuations and biological response of walleye Pollock in the Pacific coast of Hokkaido. Fish. Sci., 68, 206–209.
Ohshima, K. I. and H. Miyake (1990): A numerical study of wind-induced circulation off southern coast of Hokkaido and in Funka Bay. Umi to Sora, 66, 1–14 (in Japanese with English abstract).
Rosa, A. L., Y. Isoda, K. Uehara and T. Aiki (2007): Seasonal variations of water system distribution and flow patterns in the southern sea area of Hokkaido, Japan. J. Oceanogr., 63, 573–588.
Shida, O. and A. Nishimura (2002): Hatch date distribution of age-0 walleye pollock, Theralgra chalcogramma, off the Pacific coast of eastern Hokkaido, in relation to spawning populations. Bull. Japan. Soc. Fish. Oceanogr., 66, 232–238 (in Japanese with English abstract).
Shida, O., O. Yamamura and H. Miyake (1999): Distribution and migration to offshore of age-0 walleye pollock, Theragra chalcogramma, along the Pacific coast of southeastern Hokkaido. Sci. Rep. Hokkaido Fish. Exp. Stn., 54, 1–7 (in Japanese with English abstract).
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Rosa, A.L., Isoda, Y. & Kobayashi, N. Seasonal variations of shelf circulation in Hidaka Bay, Hokkaido, Japan, with an interpretation of the migration route of juvenile walleye pollock. J Oceanogr 65, 615–626 (2009). https://doi.org/10.1007/s10872-009-0052-6
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DOI: https://doi.org/10.1007/s10872-009-0052-6