Studies on the Osmotic Pressure of Environmental Media and Body Fluids of Marine Fish-III

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  • CHU AR JONE
    Department of Fishery, Faculty of Agriculture, Kyushu Univ.
  • HANAOKA Tasuku
    Department of Fishery, Faculty of Agriculture, Kyushu Univ.

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Other Title
  • 海産魚の体液ならびに環境水の浸透圧に関する研究-III
  • カイサンギョ ノ タイエキ ナラビニ カンキョウスイ ノ シントウアツ ニ カンスル ケンキュウ 3 マコガレイ ノ ランソウ セイジュクド ニ カンレン スル タイエキ シントウアツ ノ ヘンカ エイブン
  • Seasonal Changes in Serum Osmotic Pressure in a Demersal Fish in Relation to the Gonadal Maturation
  • マコガレイの卵巣成熟度に関連する体液浸透圧の変化

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Abstract

A study has been made on the seasonal changes of the osmotic pressure of serum in the right-eyed flounder, limanda yokohamae, a winter-spring spawner, in relation to its gonadal maturation throughout a year.<br>An increase in serum osmolality at spawning time, as seen in the pelagic fish Scomber japonicus and Trachurus japonicus, spring-summer spawners, reported in the previous paper, was also observed in this species. However the range of change was very limited, averaging a 14% rise only in serum osmolality as compared with about 50% in the pelagic fish. Also a counterclockwise migratory triangular diagram could be drawn from “osmotic pressure and temperature relation” for the surrounding sea water, as against the clockwise one for the pelagic S. japonicus and T. japonicus, showing marked different characters between both types of spawners.

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