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海峽北部及澎湖地區蟹類漁業資源之調查評估

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109年11月22日
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1188
內容
年度 2014
計劃名稱 海峽北部及澎湖地區蟹類漁業資源之調查評估
中文摘要 一、103年度本研究主要的目的是針對海峽北部及澎湖附近水域主要漁獲蟹類漁業資源進行調查與評估，首先(一)、針對台灣籠具漁船在台灣海峽北部及澎湖附近水域之動態進行統計調查與研析；(二)、針對目前台灣海峽北部及澎湖附近水域蟹類資源之漁獲組成時空間變化加以調查，並進行漁船作業漁撈日誌之委託與回收統計，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；(三)、針對主要漁獲蟹類樣本，量測其體寬、體重等資訊，並進行生殖生物學之研究，估算包含50%性成熟體寬之資訊，並提出管理之建議。 二、分析102年3月~103年10月之資料，顯示(1)、臺灣北部之蟹類籠具漁船作業區域為北緯25~28度、經度120~125度之間，集中於東經120~122、北緯25~27度之區域，但亦有發現至台灣海峽作業之籠具漁船；(2)、主要蟹類漁獲物組成為繡斑蟳、紅星梭子蟹及善泳蟳，以鏽斑蟳之數量最多；(3)、紅星梭子蟹之雌雄體寬分佈從70-180 mm，1~5月大部分皆大於100公分，但6~8月及12月時有較小型蟹加入漁場；繡斑蟳體寬分佈從70-180 mm，幾乎全年皆有較小型蟹加入漁場；(4) 鏽斑蟳產量3~8月之CPUE值皆在20克/籠具數以下， 9月份以後有較明顯的增加，直到最高點的11月，12月開始下降，最低值出現於1~3月；紅星梭子蟹其產量較鏽斑蟳低，但淡旺季有類似的狀況，唯一不同的是其盛產季提早到10月；(5)紅星梭子蟹除1月份無完熟期及9~10月極少完熟期之螃蟹外，其它月份都出現一定比例以上之完熟期螃蟹；未抱卵之螃蟹比例，以9~10月較多，但以7~8月最少；鏽斑蟳而言，8~12及3月有極少之完熟螃蟹外，其它月份都出現一定比例以上之完熟期螃蟹，未抱卵之螃蟹比例超過50%的月份有以8~12及3月，但以2及7月最少； (6) 紅星梭子蟹及鏽斑蟳之50%成熟體長分別為 9.854及8.538公分。
英文摘要 一、The purpose of this project is to survey and assess the crab resources in north of the Taiwan Strait and off Penghu. The main tasks include (1) to survey the dynamics of fishing boats aimed at the crabs in north of the Taiwan Strait and off Penghu, (2) to examine the main species composition of crabs from north of the Taiwan Strait and to design the logbook and develop the retrieval channel of logbook for collecting and analyzing spatiotemporal distribution of fishing effort, catch and CPUE, (3) to measure the crab wide for obtaining the size-frequency data and to analyze the reproductive biology of main crab. 二、The results showed that (1) the main fishing areas were between 25 and 28 degrees north and between 121 and 125 degrees east; (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 Portunus sanguinolentus was between 70 and 180 mm, and the smaller crab was found from June to Aug and Dec.; the crab width of Charybdis feriatus was between70 and 180 mm, and the smaller crab was found all year around; (4) the CPUE values of Charybdis feriatus were lower (beneath 20g/pot) from Mar. to Jul, one increased from Aug. to Nov, and decreased from Dec. ; the CPUE values of Portunus sanguinolentus were lower (beneath 10g/pot) from Apr. to Jul, and one also increased from August; (5) no or rare complete mature individual was shown in Jan., Sep. and Oct. for Portunus sanguinolentus, but there are some ones was found in the other months., the most proportion of the immature stage and early-developing stage were found from Nov. to Oct., but the minor proportion of the ones was found in Jul. and Aug.; no or rare complete mature individual was shown in March and from Aug. to Dec. for Charybdis feriatus; the most proportion of the immature stage and early-developing stage were found March and from Aug. to Dec., but the minor proportion of the ones was found in Feb. and Jul. ; (6) the first maturity length (L50) for for Portunus sanguinolentus and Charybdis feriatus were 9.854 and 8.538 cm, respectively.
計畫編號 103農科-11.2.1-漁-F2(8)