農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

矛尾翻車魨為臺灣東部海域捕獲量最多的翻車魨科魚種，其主要捕獲比例佔所有翻 車魨科約80-90%，為臺灣重要的經濟性魚種之一，且在2015年被國際自然保護聯盟 列入瀕危物種紅色名錄 (Red List) 的為無危 (Least Concern) 等級魚種。然而 ，有關矛尾翻車魨之生殖生物學與食性相關研究闕如，故本研究主要利用生殖生物 學組織切片探討臺灣東部海域矛尾翻車魨生殖情形，並搭配其食性，瞭解矛尾翻車 魨在臺灣東部海域的攝食情形。本研究採樣地點為南方澳、花蓮與新港，主要量測 其體長與採集生殖腺樣本、胃內含物樣本與肌肉樣本，採樣時間為2003年1至2018年 9月。根據矛尾翻車魨生殖樣本與組織切片資料顯示，臺灣東部海域的矛尾翻車魨雌 魚其GSI值4月時達到高峰，且根據組織切片有發現水卵與排卵後濾泡；雄性矛尾翻 車魨在4-8月發現已發育至第3-5期的精巢，且體型100公分以下的矛尾翻車魨其性腺 皆為未成熟階段，推測矛尾翻車魨體長在100公分後開始發育，且其生殖季節為4- 8月。此外，本研究中矛尾翻車魨主要攝食水母、海樽等浮游生物，且其組織中所含 的δ 15 N值隨著其體型變大而上升。

Catch amount of sharptail mola, Masturus lanceolatus , is the highest in the total catch of Molidae (80-90%), it is economically valuable. Sharptail mola was categorized to least concern by the International Union for Conservation of Nature (IUCN) in 2015. However, the reproductive biology and feeding ecology of sharptail mola are still rare. The aims of this study are to exploring the reproductive biology and foraging of sharptail mola in east of Taiwan from January 2003 to September 2018. The length measurement and samples of gonads, stomach content and muscle were collected from Nanfangao, Shinkang, and Hualien fish markets. Results indicated that the gonadosomatic index of female sharptail mola reached the highest and the hydrated oocytes and postovulatory follicles were found in April. Male sharptail mola with developing testis was discovered from April to August. The gonads of sharptail mola, body length <100 cm, were immature. It is estimated that the gonads of sharptail mola tend to mature after it grows 100 cm and the spawning season might be April to August. Sharptail mola tends to feed on jellyfish and salps in east of Taiwan, and their δ 15 N values increase with the body length.