Temporal and spatial variations in fishing conditions for skipjack tuna (Katsuwonus pelamis) in the waters off southwestern Taiwan before and after the passage of typhoon
| Autor: | Chen, Hung-Chun, 陳宏俊 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Typhoon Bopha, Lionrock, Meranti, Fanapi, Nanmadol and Tembin were selected during 2006 to 2012. By using finshing logbooks from 8 fishing vessels and hydrological data (remote sensing-based) to examine the influence of typhoon on the Taiwanese-seine fishery for skipjack tuna (Katsuwonus pelamis) in the waters off southwestern Taiwan. The intensity of typhoon affected the hydrological environment. The sea surface temperature (SST) declined after the passage of Typhoon Lionrock, Fanapi, Nanmadol and Tembin in this study area (18.5°E-120.5°E; 21.5°N-23.5°N). The maximum SST declined 1.45℃ in Typhoon Nanmadol. The range SST decreased from 0.45℃ to 0.67℃. In addition, Typhoon Bopha and Meranti were light typhoons; their maximum wind speed near the center was 23.0 m/s. In these cases, the average SST increased after the first week of typhoon. The chlorophyll-a (Chl-a) increased from 0.02 mg/m3 to 0.19 mg/m3 after typhoon, 0.66mg/m3 was the maximum Chl-a in Typhoon Lionrock. A significant association was found between the CPUE and the SST. The CPUE increased while the average SST rose; on the contrast, the CPUE declined with the drops of the SST. The fishing grounds aggregated in 119.1。E-119.5。E，22.1。N-22.7。N. Due to the disturbances of the sea, cold water area appeared in the study area. The fishing ground for Taiwanese-seine fishery shifted with the variations of SST. The fishing vessels had higher efforts in the periphery of cold water. It was also found that where there was a higher Chl-a there was a higher CPUE. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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