碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 101 / The purpose of this study is to investigate the characteristics of the changes of fisheries oceanography of the Scomber fishery in the waters off Taiwan. This study utilized the geographic information system (GIS) to analyze two major sources of data obtained between January and December in 2011. The first source of data was based on the fishing activities of 766 sample Scomber fishing vessels. The second source of data was collected from the records of the voyage data recorder (VDR). The result of the data analysis was also used to investigate the spatio-temporal distribution of catch rates in different types of Scomber fishery.
According to the data on the basis of the fishing activities of different types of Scomber fishing vessels, among all the sample vessels, the average and the total catch rate of the Taiwanese seine vessels is higher than other types of Scomber fishery. The data also shows that the catch rates of these seine vessels vary with the vessels’ gross tonnage. The catch rate of CT2 and CT3 was 58.86 kg/hour and 75.93 kg/hour, respectively. Even though the catch rate of the CT3 didn’t reach 80.00 kg/hour, the catch rate was still comparatively much higher than other sample vessels of different gross tonnage. As for the CT4~CT6 Taiwanese seine vessels in the samples, the catch rate was as high as 830.19, 762.60 and 836.69 kg/hour, respectively.
As indicated by the cumulative catch, fishing hours, and catch rate in (0.2°×0.2°) per unit areas in the waters off Taiwan, there are two major fishing grounds for Scomber fishery in the waters off Taiwan. One is located between Yilan Bay and the waters off northeastern Taiwan, which is nearby the water front where the Kuroshio Current meets the coastal waters of Mainland China. The other one is located between the waters off southwestern Taiwan and PengHu, which is nearby the water front where the Kuroshio branch meets the coastal waters of Mainland China. As suggested by the overlay of the monthly catch rate of the sample Scomber fishing vessels and the monthly sea surface temperature (SST) from the satellite, the distribution of these two fishing grounds varies with the monthly water front movement.
In summary, the data provided by the fishing activities of the sample Scomber fishing vessels and records collected from the VDR in combination can serve as important information for us to effectively gain a thorough understanding about the catch rate and the characteristics of the changes of fisheries oceanography of the mackerel fishery in the waters off Taiwan.
| Identifer | oai:union.ndltd.org:TW/101NTOU5451014 |
| Date | January 2013 |
| Creators | Chi-Yuan Weng, 翁綺苑 |
| Contributors | Cheng-Hsin Liao, 廖正信 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 33 |
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