SEASONAL DIFFERENCE OF THE PLASMA OSMOLALITIES OF SOME TELEOSTS IN HIGH-LATITUDE COLD WATER IN JAPAN (16th Symposium on Polar Biology)

• Main Authors: オガワ ミズホ, ワダ ヨウコ, マツウラ ヨウコ, フクチ ミツオ, Mizuho OGAWA, Yoko WADA, Yoko MATSUURA, Mitsuo FUKUCHI
• Format: Report
• Language: English
• Published: Proceeding 1995
• Subjects: Antarctic; Okhotsk; Antarc*; okhotsk sea; Polar Biology; Proceedings of the NIPR Symposium on Polar Biology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5279; http://id.nii.ac.jp/1291/00005279/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5279&item_no=1&attribute_id=18&file_no=1

Antifreeze glycoprotein (AFGP) and/or antifreeze proteins (AFPs) have been found not only in Antarctic teleosts but also in high-latitude cold water fish in the Northern Hemisphere. In our previous study of saffron cod, a significantly higher plasma osmolality was observed in winter than in summer fish. The plasma osmolality and Na concentration were determined in the four teleosts, Liopsetta pinnifasciata, Myoxocephalus brandti, Hypomesus pretiosus japonicus and Zoarces elongatus, collected from Notsuke Bay on the Okhotsk Sea side of Hokkaido. Both plasma osmolality and Na concentration were higher during winter than during summer. The high plasma osmolalities of the winter fishes may be mainly due to the increased AFGP and/or AFP contents.