Keita Makino

California State Polytechnic University

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Akihisa Urano

Hokkaido University

Masatoshi Ban

Japan Fisheries Research and Education Agency

Hironori Ando

Niigata University

Tomonori Azumaya

Japan Fisheries Research and Education Agency

Takeshi A. Onuma

Osaka University

Shunpei Sato

Japan Fisheries Research and Education Agency

Masa‐aki Fukuwaka

Japan Fisheries Research and Education Agency

Hiroshi Katsumata

SeaWorld Entertainment

Penny Swanson

National Oceanic and Atmospheric Administration

Kentaro Morita

The University of Tokyo

Cooperative Institutions

Hokkaido University

Japan Fisheries Research and Education Agency

University of Washington

NOAA National Marine Fisheries Service

The University of Tokyo

Kyushu University

National Agriculture and Food Research Organization

Tohoku University

NOAA National Marine Fisheries Service Alaska Fisheries Science Center

Zhejiang University

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Elevation of the Plasma Level of Insulin‐like Growth Factor‐I with Reproductive Maturation prior to Initiation of Spawning Migration of Chum Salmon

Annals of the New York Academy of Sciences (2009)

Takeshi A. Onuma Keita Makino Masatoshi Ban Hironori Ando Masa‐aki Fukuwaka

When, where, and how oceanic chum salmon initiate spawning migration is unknown although gonadal development and elevation of the activity of the pituitary–gonadal axis (PG‐axis) are essential. Insulin‐like growth factor‐I (IGF‐I) is a somatotropic signal that interacts with the PG‐axis for gametogenesis. We thus examined the plasma level of IGF‐I in immature and maturing chum salmon in the Bering Sea and the Gulf of Alaska. The maturing adults which had maturing gonads left the Bering Sea for the natal river by the end of summer, because almost all fish were immature in September. The plasma level of IGF‐I and corresponding body size in the maturing adults were two‐ to threefold that of immature fish. The plasma IGF‐I level correlated positively with the pituitary contents of follicle‐stimulating hormone and the plasma levels of 11‐ketotestosterone and estradiol‐17β. Therefore, the plasma level of IGF‐I increased with elevation of the PG‐axis activity prior to the initiation of spawning migration from the Bering Sea. Circulatory IGF‐I from visceral organs may inform the status of body growth to the PG‐axis for gonadal development that is inseparable from decision of chum salmon whether to initiate homing behavior from the Bering Sea or not to initiate spawning migration by the coming spawning season.

Plasma levels

10.1111/j.1749-6632.2008.03668.x

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Citations (19)

Changes in gene expression for GH/PRL/SL family hormones in the pituitaries of homing chum salmon during ocean migration through upstream migration

General and Comparative Endocrinology (2010)

Takeshi A. Onuma Masatoshi Ban Keita Makino Hiroshi Katsumata Weiwei Hu

Homing (biology)

Spawn (biology)

10.1016/j.ygcen.2010.01.015

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Citations (29)

ELEVATION OF THE PALSMALEVELS OF INSULIN-LIKE GROWTH FACTOR-I (IGF-I) TRIGGERS HOMING OF CHUM SALMON OF JAPANESE STOCKS

Proceedings of the Japan Society for Comparative Endocrinology (2007)

Hiroshi Katsumata A Onuma Takashi Keita Makino Shunpei Sato Fukuwaka Masa-aki

Homing (biology)

Elevation (ballistics)

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The 2007 Summer Japanese Salmon Research Cruise of the R/V Hokko maru

Kentaro Morita Shunpei Sato Manabu Kagaya Yuki Katayama Yukiharu Goda

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Citations (6)

Eco-driving behaviors of electric vehicle users: A survey study

Transportation Research Part D Transport and Environment (2019)

Guangjun Wang Keita Makino Arek Harmandayan Xinkai Wu

10.1016/j.trd.2019.11.017

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Citations (39)

ADULT CHUM SALMON POSSESS FRESH WATER ADAPTABILITY IN THE SUMMER BERING SEA

Proceedings of the Japan Society for Comparative Endocrinology (2007)

Keita Makino Masatoshi Ban Kentaro Morita Shunpei Sato Akihisa Urano

Adaptability

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Expression of hormone genes and osmoregulation in homing chum salmon: A minireview

General and Comparative Endocrinology (2007)

Keita Makino Takeshi A. Onuma Takashi Kitahashi Hironori Ando Masatoshi Ban

Osmoregulation

Homing (biology)

10.1016/j.ygcen.2007.01.010

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Citations (44)

Activity of the pituitary–gonadal axis is increased prior to the onset of spawning migration of chum salmon

Journal of Experimental Biology (2008)

Takeshi A. Onuma Shunpei Sato Hiroshi Katsumata Keita Makino Weiwei Hu

SUMMARY The activity of the pituitary–gonadal axis (PG axis) in pre-migratory and homing chum salmon was examined because endocrine mechanisms underlying the onset of spawning migration remain unknown. Pre-migratory fish were caught in the central Bering Sea in June, July and September 2001, 2002 and 2003, and in the Gulf of Alaska in February 2006. They were classified into immature and maturing adults on the basis of gonadal development. The maturing adults commenced spawning migration to coastal areas by the end of summer, because almost all fish in the Bering Sea were immature in September. In the pituitaries of maturing adults, the copy numbers of FSHβ mRNA and the FSH content were 2.5- to 100-fold those of the immature fish. Similarly, the amounts of LHβ mRNA and LH content in the maturing adults were 100- to 1000-fold those of immature fish. The plasma levels of testosterone,11-ketotestosterone and estradiol were higher than 10 nmol l–1 in maturing adults, but lower than 1.0 nmol l–1 in immature fish. The increase in the activity of the PG-axis components had already initiated in the maturing adults while they were still in the Gulf of Alaska in winter. In the homing adults, the pituitary contents and the plasma levels of gonadotropins and plasma sex steroid hormones peaked during upstream migration from the coast to the natal hatchery. The present results thus indicate that the seasonal increase in the activity of the PG axis is an important endocrine event that is inseparable from initiation of spawning migration of chum salmon.

Homing (biology)

Hypothalamic–pituitary–gonadal axis

Hatchery

10.1242/jeb.021352

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Citations (22)

RELATIONSHIP OF HOMING BEHAVIOR FROM SEAWATER TO FRESH WATER WITH PLASMA LEVELS OF SEX STEROID HORMONES IN PRE-SPAWNING CHUM SALMON

Proceedings of the Japan Society for Comparative Endocrinology (2006)

Keita Makino Takeshi Azuma Takashi Kitahashi Hironori Ando Masatoshi Ban

Homing (biology)

Sex steroid

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