Using a long-term ecological record of Dou-Liou Weir to analyze migratory behaviors of dominant fish species
| Autor: | Song, Chen En, 宋承恩 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 It is necessary to understand the behavior of native migratory fish for making a fishway with complete function. Migratory fish in freshwater can be divided to two group: diadromous fish and potamodromous fish. However, comparing with diadromous fish, there are few studies about native potamodromous fish in Taiwan. A long-term river ecological record of Dou-Liou Weir in Qing-Shui River was performed. Species richness indicated that Opsariichthys pachycephalus, Acrossocheilus paradoxus, Sinogastromyzon puliensis, Rhinogobius candidianus and Microphysogobio alticorpus are dominant species in this stream segment. Alterations of fishway of Dou-Liou Weir had been completed on Jan. 2008. Comparison of species composition, species richness and distribution of dominant species’ body length indicated that reconstruction of fishway had beneficial outcomes to local fish ecology. So the ecological record after reconstruction of fishway was used to analysis the migratory behavior of dominant species. The findings here are that O. pachycephalus adults migrate upstream during Feb. to Jun. and Nov. to Jan., A. paradoxus adults migrate upstream during Nov. to Apr., S. puliensis juveniles migrate upstream during Sep. to Nov., R. candidianus adults migrate during Mar. to Jun. and M. alticorpus adults migrate during Feb. to Jun.. All these five dominant species have regularly migration periods year by year, indicating that they are potamodromous fish and also highlighting the importance of a well-function fishway of Dou-Liou Weir. The fish migration cover the time from Sep. to Jun., so we suggest that there should be no human disturbance and keep a well fishway function during this period. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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