臺灣西南沿岸海域重要經濟蝦類之生態學研究—Ⅰ大鵬灣草蝦之向海洄游

Ecological Studies on Commercially Important Prawns from the Coastal Waters of Southwest Taiwan-ⅠEmigration of Penaeus Monodon From Dapong Bay

蘇茂森(Mao-Sen Su) ； 廖一久(I-Chiu Liao)

《臺灣水產學會刊》 14卷1期 (1987/06) Pp. 36-48

https://doi.org/10.29822/JFST.198706.0004

摘要

本研究旨在探討大鵬灣產熊蝦之向海洄游生態，結果顯示：(1)洄游期為7～12月，盛期為7～8月。(2)外游羣之高峯大多於新月或滿月時出現。(3)外游蝦於5～6月之雨季過後開始大量向海洄游。(4)外游蝦之體型，2月時最大，7月時最小。(5)1～5月之外游羣主要由體型較大之越冬羣構成；6～8月者係由體型較小之當年新生羣構成，至於9～12月者則由續留灣內之當年羣構成。(6)按季節與雌雄分別估得之體長與體重關係均呈高度顯著之Allometry式關係；雌雄間比較，在各季均有顯著差異；季節間比較，則僅於雌蝦在冬季與其他各季間有顯著差異。(7)外游雌蝦均未達成熟，雄蝦則頭胸甲長23 mm以上開始帶有精莢。(8)全體外游蝦之性比為0.4879，亦卽雌雄蝦的尾數約略相同，不過，頭胸甲長達30 mm以上者，則雌蝦多於雄蝦。

並列摘要

The emigration of Penaeus semisulcatus from Dapong Bay in southwest Taiwanwas investigated from August 1984 to April 1987.The peak emigrations occurred from July to December.The prawns preferred toemigrate at the new moon or full moon phases.Most of the prawns emigrated afterthe May-June rainy season.The size(monthly mean carapace length)of emigratingprawns ranged from 20.7 to 33.6 mm for the female and 20.4 to 29.6 mm for the male.New emigrants occurred in June-August.There was significant difference in fatnessbetween sexes.The fatness in winter was significantly different from that in theother seasons for the female.The ovaries of all females sampled were undeveloped.The rate of males with spermatophores was about 50% at a carapace length of25mm.For all specimens,the female almost equaled the male in number.However,the female outnumbered the male when carapace length exceeded 30mm.