福山試驗林哈盆溪臺灣鏟頜魚（Varicorhinus barbatulus）之生殖生物學
Other Title
Reproductive Biology of Varicorhinus barbatulus in Happen Creek, Fusham, Taipei County, Taiwan
Journal
臺灣省立博物館年刊
Journal Volume
41
Start Page
53
End Page
69
ISSN
0257-5558
Date Issued
1998-12
Author(s)
Abstract
自1992年11月至1994年4月，每月在哈盆地區以電魚法採集臺灣鏟頜魚（Varicorhinus barbatulus），探討其體全長（TL，單位：mm）和體重（W，單位：gram）關係、兩性間形態上的差異和生殖生物學。在外型特徵上，雄魚吻部周圍有明顯追星，雌魚則無。體重和體全長關係爲：log_(10) W=-5.344 + 3.185 log_(10)TL（R^2 = 0.984）。成熟雌魚的平均體全長遠大於成熟雄魚（P ＜ 0.001），體全長在160mm以上時，大多爲雌魚。雄魚在體全長爲71mm時，有50％的個體已達性成熟；雌魚在體全長爲135mm，有50％已達性成熟。由生殖腺成熟狀態、GSI（Gonadosomatic index）及卵徑分布顯示，哈盆溪臺灣鏟頜魚的生殖季節爲1至7月，生殖高峰爲2至4月，且其産卵方式爲多次産卵。由本研究的結果推論哈盆溪臺灣鏟頜魚的生殖策略爲：雄魚以提早達到性成熟來獲得較多的交配機會；雌魚延遲性成熟的時間，以獲得較大之體型或孕卵數，並以多次生殖的方式，提高子代數，同時藉著較長的生殖季，以減緩環境因子的改變所造成的仔魚死亡，確保子代的存活。
We studied morphological differences between male and female, and reproductive biology of Varicorhinus barbatulus by collecting samples at the Hapan Creek, Fushan Forest Ecosystem, Taipei County, northern Taiwan from November 1992 to April 1994. Adult males have evident peral organ around the mouth, but this is missing or few in the females. The relations of total length (TL, in mm) and body weight (W, in grams) between male and female do not differ and the combined equation for predicting body weight from total length is log_(10) W=-5.344+3.185 log_(10) TL (R^2 = 0.984). The average total length of the adult female is significantly greater than that of the adult male (P ＜ 0.001). The total length for 50 % of the adult females to reach sexual maturity is 135 mm, and for the males, 71 mm. The condition of reproductive organs, GSI (gonadosomatic index) and distribution of egg diameters in different month's samples all indicate that the breeding season for V. barbatulus is from January to July with the peak occurs between February and April. We conclude that the reproductive strategies for V. barbatulus in this region are: (1) males reach sexual maturity and begin to participate reproduction as early as possible, while females delay maturity and gain larger body dimension, (2) the females maintain multiple spawning efforts during the prolonged breeding season to reduce the mortality of larva and yearling due to sudden environmental changes and to maximize the survivor of their offspring.
Subjects
reproduction
生殖
哈盆自然保留區
福山森林生態系
臺灣鏟頜魚
Fushan Forest Ecosystem
Hapen Nature Reserve
Varicorhinus barbatulus
Publisher
國立臺灣博物館
Type
journal article