Drastic changes in otolith microstructure and microchemistry accompanying the onset of metamorphosis in the Japanese eel Anguilla japonica
Drastic changes in otolith microstructure and microchemistry accompanying the onset of metamorphosis in the Japanese eel Anguilla japonica
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DOI：
10.3354/meps161017
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发表时间：
1997-01-01
影响因子：
2.5
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Arai, T;Otake, T;Tsukamoto, K
研究了日本鳗鲡（Anguilla japonica）末期、细头鳗（Leptocephali）和玻璃鳗（Glass eel）耳石的显微结构和微化学特征。耳石增量宽度在80 ~ 160日龄间急剧增加，但在细头型中相对恒定，且较窄。Sr：Ca比值在耳石，在leptocephalus阶段增加，此后表现出快速下降，与增量宽度的增加相一致。个体发育的耳石增量宽度和Sr：Ca比值的变化模式之间的leptocephali和玻璃鳗鱼的比较强烈建议，这些巧合的变化之间的80和160 d表明在leptocephali变态的发病。变态似乎已经完成之前，增量宽度已达到最大值，这表明前者的持续时间约为20至40天。
Otolith microstructure and microchemistry were examined in Anguilla japonica final stage leptocephali and glass eels. Otolith increment width, relatively constant and narrow in the leptocephalus, increased sharply from age 80 to 160 d. Sr:Ca ratios in the otolith, which increased during the leptocephalus stage, thereafter showed a rapid drop, coinciding with the increase in increment width. A comparison of the ontogenic change patterns in otolith increment width and Sr:Ca ratios between leptocephali and glass eels strongly suggested that these coincidental changes between 80 and 160 d indicate the onset of metamorphosis in the leptocephali. Metamorphosis appeared to have been completed before the increment width had reached its maximum, suggesting a duration of the former of some 20 to 40 d.