碩士 / 國立澎湖科技大學 / 水產資源與養殖研究所 / 101 / The Austinogebia narutensis, also named “He-Gao” or “Gao-A”, is mainly used for fishing bait in Penghu. It is different from A. edulis that mainly used for food of human beings. This thesis focuses on the biology and habitat researches of A. narutensis that can be applied for future management of resources and conservation.
The results showed that maximal Cl (Carapace length) were 19.49 and 21.07 mm, and Bl (Body length) were 66.38 and, 67.61 mm for the female and male of A. narutensis , respectively. The male showed sexual dimorphorismdue to have either big chela or small chela in adult individuals. The Cl was highly linearly correlated to both Bl and PwPI (Propodus width of Pereiopod I) in the female, and also the male with big and small chela. The Cl showed curvilinearly related to the Bw (Body weight) and PIw (Pereiopod I weight). In addition, the minimal Cl and Bl of sexual maturity were estimated to be 12.61 mm and 40.07 mm for females, respectively. The OI (Ovarian index) decreased at the beginning of breeding season on November, and increased after the end of breeding season on April in the next year.
The caves of A. narutensis located from 15-250 m off the coast, and the highest density (232 ind/m2) was found at the latter location. The cave was Y-shape containing major structures of both U (U-part) and shaft (S-part), and also the secondary structures of turning chamber (tc) and side branch (br). The caves were deeper in summer, but shallower in winter. The distances of the cave openings were lower in summer and higher in winter.
The egg sizes, wight and colors of the freshly spawned, eyed and pre-hatched eggs were 0.55×0.54 mm, 0.09 mg in orange, 0.61×0.58 mm, 0.15 mg in greyish green, and 0.72×0.62 mm, 0.24 mg in translucent, respectively. Under the conditions of water temperature, The hatched larva had four zoeal stages and metamorphosed into the decapodid at the 13th day reared in 24-25℃ and 34-35‰ salinity.
The A. narutensis should belong to multi-spawning pattern since the ovary developed during the sampling period. The life duration were two years at last. Moreover, the analysis of sediment in the habitat with the highest density suggests that the favorite particle size for A. narutensis were medium sand to fine sand.
| Identifer | oai:union.ndltd.org:TW/101NPHT0833004 |
| Date | January 2013 |
| Creators | Chia-Wen Yeh, 葉佳雯 |
| Contributors | Jhy-Yun Shy, 施志昀 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 103 |
Page generated in 0.0099 seconds