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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47606

Title: 2010-2015年間宜蘭灣定置網漁業
Authors: Lin, Yi-Chieh
林奕潔
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: 定置網漁業;魚種群性;平均營養位階;宜蘭灣
Set-net fishery;Species group;Mean trophic level(MTL);Yilan bay
Date: 2016
Issue Date: 2018-08-08T03:24:53Z
Abstract: 摘要 宜蘭縣沿岸是我國定置網漁業最為蓬勃發展的地區,為探究宜蘭沿岸漁業生態系統之變遷,本研究利用2010~2015年間,宜蘭縣石城沿岸光榮、東澳沿岸新協發及南澳沿岸川田等三處定置網漁場之漁獲紀錄資料,進行漁獲魚種及魚種群性之分類與漁獲統計分析,並利用各漁獲魚種之營養位階(TL)及漁獲量,估算隱含有生態系統變遷意義之平均營養位階(MTL)及MTL貢獻度百分比(CTL)等生態指標。其結果分述如下: 一、根據2010~2015年間三處定置網漁場之漁獲紀錄資料顯示,其漁獲魚種分別有47科115種、70科151種及70科147種魚類,合計共有86科197種魚類,其中以珊瑚礁群性魚類最為多樣,共計發現有35科96種魚類。 二、由2010~2015年間三處定置網漁場之漁獲紀錄資料顯示,其漁獲魚種以洄游群性魚類佔有較高的漁獲量,其漁獲重量組成比例均佔各漁場魚種群性比例的60%以上,其中又以鯖科的正鰹(TL=4.4)、扁花鰹(TL=4.3)及齒鰆(TL=4.3)三種洄游群性魚類為此三處定置網漁場前三大漁獲量之魚種。 三、根據此三處定置網漁場季別漁獲魚種重量組成顯示,宜蘭沿岸春季時以正鰹、齒鰆、扁花鰹、藍圓鰺及巴拉金梭魚為主;秋季時以白帶、正鰹、齒鰆、日本馬加鰆及鱷形叉尾鶴鱵為主;冬季時則以齒鰆、白帶、扁花鰹、日本馬加鰆、花腹鯖及矛尾翻車魨為主。此外,由各漁場中各魚種MTL貢獻度百分比(CTL)亦顯示,這些季節性魚種均在CTL中佔有較高的比例。 四、由2010~2015年間三處定置網漁場年別漁獲量與MTL變動趨勢顯示,2010年起至2015年間有下降之趨勢,且漁獲魚種營養位階(TL)小於4的漁獲比例有逐年增加之勢。 綜上可知,宜蘭灣沿岸光榮、新協發及川田三處定置網漁場自2010年起,其MTL似有下降之趨勢,亦即高營養位階魚種之漁獲比例似有逐年減少之勢,顯示其漁業資源之食物網結構似有逐年弱化之情形。 關鍵詞:定置網漁業、魚種群性、平均營養位階、宜蘭灣 
Abstract Set-net fishery is one of the most important and representative fisheries in the coastal water off the Ilan county. In the present study, we have investigated the fluctuations of ecosystem for coastal fisheries in the water off the Ilan county using catch data from setnets respectively located in the coastal water off Shi-Chen, Dong-Ao, and Nan-Ao of the Ilan county during 2010-2015. Catch species of setnets were investigated by the analysis of species composition. Mean trophic level (MTL) and contribute of trophic level (CTL) of each catch species were further analyzed and estimated. Major results from this work were described as follow: 1.Catch species from 3 indivual sentnet comprised 47 families and 115 species, 70 families and 151 species, 70 families and 146 species, respectively. In total, catch species of all these 3 setnets comprised 86 families and 197 species. The diversities of catch species mainly resulted from the catch of coral reef fish species, comprising 35 families and 96 species. 2.Pelagic fish species accounted for >60 % of total weight of catch. Among these pelagic species, Katsuwonus pelamis (TL=4.4), Auxis thazard (TL=4.3), Sarda orientalis (TL=4.3) respectively ranked the first, second and third in terms of total weight of catch. 3.In spring, K. pelamis, S. orientalis, A. thazard, Decapterus maruadsi and Sphyraena barracuda accounted for the majority of catch. In autumn, Trichiurus lepturus, K. pelamis, S. orientalis, Scomberomorus niphonius and Tylosurus crocodilus accounted for the majority of catch. In winter, S. orientalis, T. lepturus, A. thazard, S. niphonius, Scomber australasicus and Masturus lanceolatus accounted for the majority of catch. Additionally, all these seasonal target species had relatively higher CTL. 4.Results from the fluctuation of annual catch and MTL for these three setnets during 2010-2015 indicated that a downtrend in annual catch and an uptrend in annual catch of fish species with relatively lower TL (< 4). Taken together, MTL of all these 3 setnets have decreased since 2010 and catch of fish species with high TL continued to drop annually, indicate that those marine food chains required for fisheries resource have been weakened annually. Key words:Set-net fishery, Species group, Mean trophic level(MTL), Yilan bay
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0040347003.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47606
Appears in Collections:[環境生物與漁業科學學系] 博碩士論文

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