碩士 / 國立海洋大學 / 環境生物與漁業科學學系 / 91 / This study was examined the reproductive biology of blue shark, Prionace glauca occurred in northwestern Pacific Ocean. All specimens of this study were captured by longline from surface to 200m in depth from Oct. 2001 to Feb. 2003. A total of 1,079 specimens (including 576 males and 503 females) of blue shark, Prionace glauca were determined in this study, included 40 gravid females. Females and males reached sexual maturity at about 178-200cm and 172-206cm, respectively. Reproduction pattern of blue shark is yolk sac placenta type with uterine compartment. Ova (eggs) are ovulated when they reach 16-20mm in diameter. The data of fertilized eggs and embryos suggested the mating season occurres in early spring to late summer, a gestation period about 10 months and parturities between February and May for this species. Size at birth is approximately 37-45.5cm total length (TL) and litter size varies from 3-53 with a mean value of 29. The predicted reproductive cycle is two years.
| Identifer | oai:union.ndltd.org:TW/091NTOU0451011 |
| Date | January 2003 |
| Creators | Wu Tzu-yi, 吳姿儀 |
| Contributors | Joung Shoou-Jeng, 莊守正 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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