碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 105 / This study conducted the ecological risk assessment for 69 major species caught by longline, pole and line, gillnet, Taiwanese seine, trawl and light blanket net fisheries in the eastern waters off Taiwan using the productivity and susceptibility analysis (PSA). The PSA evaluated productivity and susceptibility attributes for a stock. In this study, the productivity attributes, including maximum age, maximum size, von Bertalanffy growth coefficient, age at 50% maturity, size at 50% maturity, reproductive strategy, fecundity and trophic level, were adopted to represent the capacity of the stock to recover if the population is depleted; while the susceptibility, including availability, catchability, schooling behavior, fish price and IUCN red list, were represents the potential for the stock to be impacted by the fishery. The values of productivity and susceptibility attributes were classified into high, medium and low levels. The vulnerability indices of stocks were assessed through the scores of productivity and susceptibility. The results indicated that 7 species were high risk, accounting for 5% total catches. The stock status of black marlin and narrow barred mackerel have not been assessed and further evaluation should be needed. 14 species were moderate risk, accounting for 6% total catch. The risks were relatively low for other fishes. The species with high risk were mainly influenced by longline and gillnet fishery, which should be investigated. The results of risk analysis were relatively sensitive to the susceptibility attributes, especially for the “IUCN”. The average risk would increase when the “IUCN” attribute was removed. The results of analysis was insensitive to the “size at 50% maturity” attribute and the scores changed slightly when this attribute was removed. The data quality analysis indicated that data quality were moderate for many species, such as flatfish, filefish, Japanese Spanish mackerel, sunfish, Japanese scad and bullet tuna, which were highly exploited species in eastern Taiwan. Collection of fisheries information and biological studies should be enhanced.
| Identifer | oai:union.ndltd.org:TW/105NTOU5451020 |
| Date | January 2017 |
| Creators | Lin, Chih-Yu, 林治瑜 |
| Contributors | Wang, Sheng-Ping, 王勝平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 92 |
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