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タイトル: Morphological changes and otolith growth during metamorphosis of Japanese eel leptocephali in captivity
著者: Kuroki, Mari
Fukuda, Nobuto
Yamada, Yoshiaki
Okamura, Akihiro
Tsukamoto, Katsumi
キーワード: Anguilla japonica
leptocephalus
metamorphosis
morphology
otolith increment formation
survival
water temperature
発行日: 2010年8月20日
出版者: International Coastal Research Center, Atmosphere and Ocean Research Institute, the University of Tokyo
掲載誌情報: Coastal marine science. Vol. 34, No. 1, 2010, pp. 31-38
抄録: To know the morphological changes in body shape and otolith growth during metamorphosis of anguillid eel larvae, we observed the process of metamorphosis in artificially reared leptocephali of the Japanese eel Anguilla japonica that were reared at four different temperatures, 15, 20, 25 and 30℃ for 30 days. After the onset of metamorphosis, total length and relative preanal length decreased following the progress of metamorphosis. Relative body depth showed almost constant values at the early metamorphosis stage, but showed a rapid decrease at the late metamorphosis stage. Survival of the 11 leptocephali of each experimental group held at four different temperatures showed the highest rate of 81.8% at 25℃. Similarly, the number of leptocephali that completed metamorphosis to be glass eels was greatest at 25℃ (5 specimens), suggesting that the temperature of 25℃ facilitated the metamorphosis and survival of leptocephali. Otoliths drastically grew fast after the initiation of metamorphosis and deposited a mean width of 47.0μm during the 30 days of the experimental period, while otoliths of non-metamorphosed leptocephali showed only a slight mean increase of 11.2μm during the same one-month period. These results are the first demonstration of morphological change and otolith deposition during the metamorphosis process in anguillid eels.
URI: http://hdl.handle.net/2261/51647
ISSN: 13493000
出現カテゴリ:Coastal Marine Science
Coastal Marine Science

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