研究目的是探討大和沼蝦在台灣不同溪流的生殖生態和族群動態之差異。採集地點為台灣西部的四重溪、高屏溪和位於台灣東部的花蓮溪、秀姑巒溪。採集到的樣品帶回實驗室測量分析大和沼蝦體長體重、性別比例、生殖腺指數(GSI)和肝胰臟腺指數(HSI)、抱卵母蝦比例、抱卵數目、卵體積的統計分析。結果發現，高屏溪族群有顯著最大的頭胸甲長，四重溪和秀姑巒溪之間沒有差異，花蓮溪則是顯著最小。頭胸甲長和抱卵數量有正相關，四重溪和高屏溪族群抱卵數量顯著較多，而秀姑巒溪族群抱卵數量顯著多於花蓮溪族群。而卵體積四重溪、高屏溪和秀姑巒溪之間沒有差異，但花蓮溪則是顯著最小。在雌雄比例上，四重溪和花蓮溪為雌性較多，高屏溪和秀姑巒溪則為雄性較多。從抱卵母蝦比例推測四重溪、高屏溪、秀姑巒溪及花蓮溪繁殖季為春夏二季。生殖腺指數(GSI)變化趨勢跟抱卵母蝦比例相似，四條溪流在春夏二季維持高水平。雖然大和沼蝦同在溪流環境中棲息，但隨著溪流環境的不同，大和沼蝦的生殖生態也有所不同。

The aim of study is to investigate the differences of reproductive biology and population dynamics of Macrobrachium japonicum from different rivers in Taiwan. Sampling sites include Sichongxi River and Gaoping River in western Taiwan, and Xiuguluan Rive and Hualian River in eastern Taiwan. After sample were taken into laboratory, carapace length, body weight and egg size were measured, sex ratio, GSI, hsi, ovigerous female ratio were calculated, egg number was enumerated. The results showed that population from Gaoping River had significant larger carapace length whereas those from Hualian River was significantly smaller. There was no difference between Sichongxi River and Xiuguluan Rive in carapace length. There was a positive linear relation between carapace length and egg number. In Sichongxi River and Gaoping River, populations had significantly more egg number. There was no significant different between Sichongxi River, Gaoping River and Xiuguluan River in egg volume, but significantly smaller in Hualian River. More females were found in Sichongxi River and Hualian River, whereas in Gaoping River and Xiuguluan River more male were found. Similar trend was found for the gonadosomatic index(GSI) and ovigerous female ratio. GSI remain high during spring and summer in Sichongxi River, Gaoping River, Xiuguluan River, Hualian River. Although M. japonicum live in river, it showed different reproductive strategies in different environment.

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