碩士 / 國立高雄海洋科技大學 / 漁業生產與管理研究所 / 98 / Assessment of standing stock is the key point for the evaluation of Sergia lucens of all harvest impacts and for fishery regulation. 17 test-fishing of trawls of 4 cruises were carried out with a Simrad EY500 scientific echo sounder onboard to collect acoustic data of Sergia lucens in southwestern coast off Taiwan, from Feb. 11th to 12th and from 20th to 21st, 2010. By the nonparametric test results showed the same age group. And the Sergia lucens are included in the mean volume backscattering strength data back after deducting the volume behind the trash after the scattering intensity, and is Sergia lucens biomass and the catch ratio test, the results indicate that closely related, R = 0.9892** (p<0.01).
In this study, another search-related parameters and sea conditions and fishing are Sergia lucens biomass were related examinations, the results of these tests reached a significant level by the parameters, the construction of a multiple regression analysis. In order to estimate the standing stock of Sergia lucens, a discriminating function was established in this study by using factors of fishing conditions, such as mean volume backscattering strength （MVBS）, time of fishing operation（FT） and sunrise（ST）. As results shown, the first discriminating function （D1 = -0.555MVBS -0.355FT +1.175ST） can predict the catch rate of Sergia lucens very effectively and up to 100% accuracy.
Finally, mean predicted catch rate of three types were estimated as 66.5%, 46.5% and 3%, respectively. This can be used to convert the actual weight of catch, and resulted in the standing stock of Sergia lucens will be the accumulated weight of predicted catch.
| Identifer | oai:union.ndltd.org:TW/098NKIM8451011 |
| Date | January 2010 |
| Creators | Chuan-Yuh Zeng, 曾川育 |
| Contributors | Jen-Ming Liu, 劉仁銘 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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