Study on the spatio-temporal characteristics of the catch of the recreational fishing boats in Sain-Ou port using GIS

• Main Author: 王幼美
• Other Authors: Hsueh-Jung Lu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/17298062170452224261

碩士 === 國立臺灣海洋大學 === 環境生物與漁業科學學系 === 96 === Sain-Ou Fishing Port, located near Taipei Metro, is a domestic port with highest number of recreational fishing boats. However, few relevant documentation regarding the spatial-temporal information of its fishing activity were reported. In this study, we collected daily fishing logbook from sample boats during 2000-2006 and integrated with bathymetric data by GIS to analyze spatial-temporal characteristics of locations, species composition and abundance, which would be helpful to the fishery management and research. The results are summarized as follows: 1. The annual catch of each sampling boats were about averaged 31 tons which were consisted of 55 species. Nine species dominated 91.4% of the total catch, including Trichiurus lepturus、Katsuwonus pelami、Loligo edulis 、Dentex tumifrons 、Trachurus japonicus 、Scomber australasicus、Parapristipoma trilineatum、Decapterus maruadsi and Cookeolus japonicus. 2. The annual CPUEs of the 9 dominant species indicated that most of them fluctuated or declined year by year, except those for Trichiurus lepturus. The most fluctuant species were Loligo edulis, which is a decisive species affecting activity rate of anglers because of its high market value. 3. The density of locations, catch and species aggregated by grids suggested that waters shallower than 200 m were main fishing area. Three hot spots with relatively high activity were identified in the waters around Keelung Isle, remote Isles (Peng Chia Yu、Mien Hua Yu、Hua PingYu)and Gui-Shan Isle. 4. In the main fishing areas, the amounts of catch were related to characteristic of sea bottom including sediment, depth and slope. Sandy seabed comprising the largest area contributed 60.2% of total catch; activities on rocky seabed were relatively high although such sediments were rare. About 19% of fishing locations were took place in bottom depths between 121~130 m and 16% were between 81~90 m. About 75% of catch occurred from slope of 0.1° to 1° and 19% from -1° to 0°. 5. According to the results of the ANOVA, characteristics of sea bottom has significant difference (p<0.05) on CPUE of specific species. The CPUEs for Trichiurus lepturus in mud-sand sea seabed and dentex tumifrons in sand sea seabed were significantly high. The CPUEs for Katsuwonus pelami in depths of 80-100 m and 140-160 m, and CPUEs for trachurus japonicus in depths of 80-100 m were significantly high. Seabeds with slope of -3°~-1° and -1°~+1° has significant high CPUE of Katsuwonus pelami and dentex tumifron.