Title page for etd-0106115-120332


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URN etd-0106115-120332
Author Hsiao-hao Chen
Author's Email Address No Public.
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Department Marine Biotechnology and Resources
Year 2014
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Relationship between larval fish assemblage and hydrographic characteristics in the waters southwest of Taiwan in summer and winter
Date of Defense 2015-01-23
Page Count 106
Keyword
  • larval fish
  • the waters southwest of Taiwan
  • assemblage
  • distribution
  • hydrography
  • Abstract The objective of this study was to investigate the relationship between spatial distribution of larval fish assemblage and local hydrographic characteristics during two distinct monsoon seasons (the southwesternly monsoon in summer and the northeasternly monsoon in winter) in the waters southwest of Taiwan. We used the cruises of “R/V Ocean Researcher III” to collect zooplankton and hydrographic data in September and December, 2012. Succession of the water masses (South China Sea Surface Current in summer and Kuroshio Branch Current in winter) driven by monsoons may strongly influence the local hydrographic characteristics, such as the sea-surface temperature, salinity, and SiO2. In total, 123 taxa of larval fish, belonging to 79 genera and 56 families, were identified, with a mean abundance of 1510 ± 382 ind./1000 m3 during the study period. Among these, a total of 78 taxa of larval fish belonging to 43 genera and 32 families with a mean abundance of 990 ± 382 ind./1000 m3 were found in summer, and 107 taxa, 61 genera and 48 families with mean abundance of 2034 ± 602 ind./1000 m3 in winter. The families and species number were significantly higher in winter than in summer. Although the abundance of larval fish in the winter was higher than that in the summer, no significant difference was observed. The five predominant taxa of larval fish found in this study area were Diaphus A group, Engraulis japonicus, Equulites rivulatus, Bregmaceros sp., and Benthosema pterotum, together they accounted for 37.67% of the total larval fish catch. Seasonal variation in the species composition of larval fish was significant, some taxa only occurred with a peak abundance in a specific season. For example, Engraulis japonicus, Sillago sihama, Pennahia argentata, Equulites rivulatus, and unidentified Engraulidae dominated in summer, while Diaphus A group, Bregmaceros sp., Equulites rivulatus, Benthosema pterotum, and Engraulis japonicus were abundant in the winter. According to the results of this study, we suggested that the succession of the water masses driven by seasonal monsoon system may affect the distribution of larval fish in the waters southwest of Taiwan.
    Advisory Committee
  • Chang-Tai Shih - chair
  • Tew-Kwee Siong - co-chair
  • Wen-Tseng Lo - advisor
  • Hung-Yen Hsieh - advisor
  • Files
  • etd-0106115-120332.pdf
  • indicate access worldwide
    Date of Submission 2015-02-11

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