著者

岸野 底 四宮 明彦 寿 浩義

出版者

日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.55, no.1, pp.1-8, 2008-05-15 (Released:2012-07-13)

参考文献数

28

被引用文献数

3

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Fasting Ryukyu-ayu (Plecoglossus altivelis ryukyuensis) larvae (newlyhatched, 15-20 day old and 50 day old individuals) subjected to ranges of experimental water temperature and salinity [15-21°C (2 or 3 steps) and 0-30 psu (3 or 4 steps), respectively] showed greatest survival rates in water temperatures of 15-18°C and salinity of 5-15 psu. Such water temperature and salinity ranges paralleled those of brackish water in the Yakugachi River during the early life stages of Ryukyuayu, and supported a field investigation which indicated that Ryukyuayu larvae occurred mainly in brackish water. The experimental result is probably illustrates the limits of osmoregulatory adjustment in larvae of this species.