| Summary: | 博士 === 國立中山大學 === 海洋生物科技暨資源學系研究所 === 103 === The aims of this study is to (1) establish the baseline information of the shrimp assemblages in the coastal area in order to map the biotopes, (2) elucidate how the environmental factors act on shrimp assemblages, (3) realize the reproductive season and information on the dominant species reproductive ecology and (4) combine the information on reproductive biology and hydrology to investigate the habitat usage during the life cycle history. Shrimp samples were collected twice per season from April 2002 to August 2010, with a beam trawl operated by R/V Ocean Researcher No. 3 at 10 stations, Wanggong, Taisi, Cigu, Jiading, Zouying, Jhongjhou, Linyuan, Dapeng, Linbian and Fangliao, in the western waters off Taiwan. Simultaneously, various environmental factors were also recorded by CTD. Meanwhile, we also collected the samples from fish market for reproductive biology study since January 2009 to December 2011. In total, 54,671 individual shrimp were obtained, including 12 families, 27 genera, and 53 species. Among the families, Penaeidae consisted of the most numerous species (25 species,), followed by Alpheidae (9 species) and Scyllaridae (5 species). Metapenaeopsis palmensis (49.1%), Parapenaeopsis hardwickii (29.8%), Parapeaneopsi cornuta (5.7%), Trachysalambria curvirostris (5.1%), and M. barbata (2.0%), were the numerically dominant species, contributing 91.7% of the total catches. There is significant spatial distribution in the waters off western Taiwan. The north group and south group were dominant by M. palmensis and P. hardwickii, respectively. This phenomena might be related to the year round current and water mass seasonal oscillation in the Taiwan Strait. The reproductive season of the dominant shrimp were all occur before rainy season when the water temperature exceeds 25˚C, and the juveniles were recruit after rainy season, only the larvae born in the late spawning season will successfully recruit in the dry season in September-November when the water salinity is higher than 33.5 psu, due to the low salinity and turbid water during the rainy season.
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