海草生態系的變動對於探討環境變化的效應是很有參考性的。本研究所利用的物種為
出現在台灣綠島龜灣鼻海草床的一種小型三鰭鳚小雙線鳚(Enneapterygius minutes)。牠
在海草床龐大的數量與牠將海草床當做固定的棲所使得此魚種很適合用以監測海草床
生態變動的情況。從2007 年4 月到2008 年7 月每月進行採樣。小雙線鳚的年齡與生長
情況是利用耳石的微構造來探討。母魚生殖腺的發育階段則是利用組織切片的特徵來決
定，同時利用窩卵數與生殖腺指數來推知其最小性成熟體長與生殖的季節性。體長頻度
的分析被用以探討生殖期群體數量及添入量。結果顯示，小雙線鳚是一種生命週期短的
物種。雖然其窩卵數小，但卻有全年生殖的能力，而生殖高峰季主要由前一年的冬末到
隔一年的春末。補充群的出現大約在生殖過後的一個月發生。由這些資料顯示，小雙線
鳚利用海草床當做一個生殖與育卵的場所。藉由此三鰭鳚與海草床的緊密關係，當海草
床面臨環境變遷時可以利用此物種來監測環境對生態系的影響。

Fluctuation of the seagrass ecosystem may be informative to the impacts of
environmental changes. This study focuses on a small, inconspicuous triplefin blenny,
Enneapterygius minutus, found in a specific tide pool of seagrass meadow on Gui Wan Bi,
Green Island, Taiwan. Its high abundance and stable residence make this species a suitable
candidate to monitor the condition of the seagrass ecosystem. Monthly collections were made
during low tide from April 2007 to July 2008. The otolith microstructure was examined to
study their age and growth circumstance. Developmental stages of the ovaries based on
histological characteristics together with data of batch fecundity and GSI value were applied
to estimate size at maturation and the spawning seasonality of the individual assemblages in
the tide pool. A length-frequency analysis was made by using the monthly data.
Enneapterygius minutus is a kind of short life species. It has a quite low batch fecundity and a
year-long breeding ability with a seasonal high peak mainly from late winter to late spring.
The recruitment of juvenile individuals began about a month after breeding had occurred.
These data show that Enneapterygius minutus uses seagrass meadows as a hatching and
nursing habitat. According to the close relationship between Enneapterygius minutus and
seagrass meadow, it would be possible to monitor this ecosystem by using this species as an
indicator when it is under environmental stress.

致謝 …………………………………………………………………………………. i
Abstract ……………………………………………………………………………... ii
中文摘要 ………………………………………………………………………..…... iii
Contents …………………………………………………………………………...... iv
Figure Contents …………………………………………………………………...... v
Introduction ………………………………………………………………………… 1
Materials and methods …………………………………………………………...... 6
Results ……………………………………………………………………………..... 11
Discussion …………………………………………………………………………… 14
References …………………………………………………………………………... 18
Figures ……………………………………………………………………………..... 21-38
Vita ………………………………………………………………………………….. 39

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