Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/21799
標題: 草屯烏溪流域獅象山農場條紋二鬚(Puntius semifasciolatus)之生殖生物學研究
Reproductive Biology of Cyrpinid teleost, Puntius semifasciolatus in the WU River
作者: 陳秀溶
JUNG, CHEN HSIU
關鍵字: Puntius semifasciolatus
條紋二鬚
WU River
reproductive biology
freshwater fish
Cyrpinidae
Barbinae
烏溪
生殖生物學
淡水魚
鯉科
亞科
出版社: 生命科學院碩士在職專班
摘要: 為了解草屯烏溪流域獅象山農場條紋二鬚(Puntius semifasciolatus)之生殖生物學,自2003年一月至2003年十二月止,每月定期至烏溪支流採樣。野外採集的標本數共572尾,其中雌魚417尾、雄魚142尾、仔魚13尾,其雌魚和雄魚的比例為2.9:1,經卡方分析(X2 analysis)與雌雄魚為1:1有顯著差異(P<0.01)。經外部型態觀察、卵巢組織切片觀察、生殖腺體重指數(G.S.I.)計算、卵徑頻度分布、孕卵量估計等來探討條紋二鬚的生殖週期、產卵量。由外部型態觀察,條紋二鬚的雄魚在繁殖季有明顯的婚姻色,雄魚腹部會呈鮮紅色,且雄魚的外部型態較細長呈梭狀,而雌魚的體高則較雄魚為高,用單向變方分析雌雄魚的體高體長比(體高/體長)兩者間有顯著差異。由G.S.I.值的月別變化,推測產卵期為4-8月;由G.S.I.和體長關係以及成熟個體百分比與體長的關係,推測雄魚的最小成熟體長為17.5mm,雌魚為21mm。由卵巢組織切片觀察及卵徑頻度分布,可知卵巢中至少有兩群以上不同成熟階段的卵細胞,顯示條紋二鬚應為多次產卵型。條紋二鬚單批孕卵量為122~2596個卵,且孕卵數有隨體長、體重、生殖腺重之增加而增多的趨勢。
The purposes of this study were to understand reproductive biology of the Puntius semifasciolatus in the Wu River. From Januray to December 2003, fish were sampled every month. During the one-year period, 572 individuals were collected. Among them were 417 female fish, 142 male fish, 13 larvae. The sex ratio was significantly different from 0.5 with X2 test. The spawning season extends form April to August, based on changes of the gonadosomatic index. Length of first maturity in male was estimated to be 17.5 mm and in female was 21 mm, based on the relationship between mature percentage and standard length. Histological examinations revealed at least two groups of oocytes in different developing stages in the ovaries.So this species should be multi-spawner in a spawning season. The batch fecundity of this species was 122~2596. The batch fecundity increased with the elevation of body length, body weight, and gonad weight.
URI: http://hdl.handle.net/11455/21799
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