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研究報告

更新日期: 2015-02-09
點閱數: 1,536

海峽北部蟹類漁業資源之調查評估

年度 2013
計劃名稱 海峽北部蟹類漁業資源之調查評估
中文摘要 蟹類資源是台灣海峽北部漁業中主要漁獲物之一,為確保台灣海峽北部蟹類資源之永續利用,本研究計畫主要的目的是針對海峽北部蟹類漁業資源進行調查與評估,擬先對過去台灣底拖網漁業在台灣海峽北部蟹類資源之漁業統計資訊及其時空分佈(含努力量、漁獲量及CPUE等)進行研析,並針對目前台灣漁船在台灣海峽北部分對蟹類資源之利用現狀與動態進行統計與調查,最後亦針對目前台灣海峽北部蟹類資源之漁獲組成之時空間變化加以調查,並進行漁船作業漁撈日誌之設計及委託,以利於目前漁獲努力量、漁獲量及CPUE之時空分布特性之收集與研析,並提出管理之建議。   分析由臺灣大學海洋研究所底魚中心所提供之臺灣歷年單(1970~2010年)、雙(1970~1989)拖網漁船作業日誌資料,顯示海峽中北部區域為蟹類資源較豐富之區域,其主要分布範圍在北緯24-26度半、東經120-125度間,其主要盛產期為冬季,約在11-1月間,但單拖網之漁獲蟹類資源之位置較雙拖網者偏北偏東;分析拖網歷年之CPUE變化,顯示總體蟹類單位努力漁獲量從早期一直下降至2001到最低點,2001後蟹類之CPUE值有上升之趨勢。  分析3~10月籠具之作業日誌資料,顯示(1)、臺灣北部之蟹類籠具漁船主要作業區域為北緯25-27度、東經121-123度間;(2)主要蟹類漁獲物組成為繡斑蟳、紅星梭子蟹及善泳蟳,但以鏽斑蟳之數量最多;(3)、紅星梭子蟹之雌雄體寬範圍在88-180 mm,6~8月時有較小型蟹加入漁場;繡斑蟳體長分佈從70-180 mm,6~10月時皆有較小型蟹加入漁場;(4)鏽斑蟳CPUE月別變化顯示,3~7月之值皆在20克/籠具數以下,8月份以後則有較明顯的增加;紅星梭子蟹8月份CPUE值有明顯上升,4-7月時則相對有較低 (小於10克/籠具數)。為配合政策之需要,從8月起亦加入主要漁獲蟹類之生殖生物學之研究,將推估包含50%最小成熟體寬之估計,以供相關單位決策之參考。
英文摘要 The purpose of this project is to survey and assess the crab resources in north of the Taiwan Strait. The main tasks include (1) to analyze the Taiwanese trawler fisheries’catch and effort statistics in north of the Taiwan Strait and to obtain the historic trend of abundance indices of the crabs resources, (2) to survey the amount and dynamics of fishing boats aimed at the crabs in north of the Taiwan Strait and to measure and obtain the size-frequency data, (3) to examine the main species composition of crabs from north of the Taiwan Strait, (4) to design the logbook and develop the retrieval channel of logbook.   According to the logbook data of Taiwanese pair (1970~1989) and otter(1970~2010) trawlers fisheries’ catch and effort statistics, there is more abundant crab resources in the center and north of Taiwan Strait, and it distributes between 24 degree and 26.5 degree north and between 121 degree and 123 degree east. The main fishing season is during winter (from Jan. to Dec.). The CPUE trend shows that the value decreases from 1970 to 2001 and CPUE increases after 2001.  According to the logbook data from the specimens of crab-trap fishing in 2013 (from Mar. to Oct.) showed that (1) the main fishing areas were between 25 degree and 27 degree north and between 121 degree and 123 degree; (2) the main fishing species were Charybdis feriatus, Portunus sanguinolentus and Charybdis natator in the northern waters of Taiwan Strait, and the most abundant species is Charybdis feriatus; (3) the crab width of is Portunus sanguinolentus between 88 and 180 mm, and the smaller crab was found from June to Aug; the crab width of is Charybdis feriatus between70 and 180 mm, and the smaller crab was found from June to Oct.; (4) the CPUE values of Charybdis feriatus were lower (beneath 20g/pot) from Mar. to Jul, and one increased from Aug; the CPUE values of Portunus sanguinolentus were lower (beneath 10g/pot) from Apr. to Jul, and one also increased from August.
計畫編號 102農科-11.2.1-漁-F4(4)
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