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研究報告

更新日期: 2015-02-09
點閱數: 1,647

海峽北部鎖管漁業資源之調查評估

年度 2013
計劃名稱 海峽北部鎖管漁業資源之調查評估
中文摘要 摘要 近年來鎖管產量有逐漸下降的趨勢,可見鎖管資源量有越來越少的情形。目前大部分的研究著重在火誘網漁獲量與環境之相互關係,以及針對火誘網所捕獲之劍尖槍鎖管生物學部分,而拖網也是捕獲鎖管之漁法之一。鎖管外套膜長(ML)量測的結果顯示,拖網所捕獲之鎖管,其外套膜長之分布範圍(1.8-40.82cm),比火誘網所捕獲之鎖管(2.1-32.9cm)來得廣。在性比部分,火誘網所捕獲到之雄性鎖管較多。鎖管生殖腺指數(GSI)之月別變動顯示,兩種漁法所捕獲之鎖管,其GSI皆在春秋兩季時出現高峰值。此外,由50%性成熟體長顯示,拖網所捕獲之雌雄鎖管(除春季外)均比火誘網大。由外套長與日齡之成長關係式顯示,劍尖槍鎖管以指數型(Exponential model)方程式作為最佳成長方程式 另外在東北部海域鎖管漁業長期變動特性上,由採樣之尖尾鎖管標本觀察,年平均體長在2001年至2012年間變動不大,約為90 mmML。 年平均體重則在2001年至2007年間明顯下降,2008年升高,2009年至2011年則下降 。在資源量指標方面,多數年度僅由期初季節群添加支應全年漁期(2002-2006年)。 但部分年度則於漁期中有明顯之添加群(如2007、2011年)。 2012前半年鎖管漁業活動概況方面,捕獲鎖管之漁業包含拖網、刺網、火誘網、扒網、雜魚延繩釣、一支釣、曳繩釣等漁業共有236艘樣本船。其中鎖管漁獲量以拖網及火誘網為主分別捕獲251 ton 及244 ton,作業漁船的努力量主要集中於東北部海域、西部海域、澎湖海域,其中以東北部海域的分佈最廣,火誘網船主要於25°N以北的東北陸棚再等深線100-200m間作業;拖網漁業方面作業分部海域廣闊自26°N以南延伸西南海域,整個西部海域皆有拖網漁船的作業活動;而澎湖周邊海域以一支釣漁船作業為主。其漁獲量與努力量分布相似,而高CPUE作業海域由25°N往南至雲彰隆起之間以拖網漁獲效率最高。 臺灣沿近海漁業之集魚燈使用概況,以臺灣東北部最為興盛,平均懸掛燈數44盞;各噸級集魚燈使用上,呈現指數型的增加,CT0 至CT6總平均燈數10.4 - 98.1盞。   關鍵詞:鎖管,臺灣東北部海域,拖網漁業,火誘網漁業,集魚燈
英文摘要 Abstract Resources of squids became less and less, thus lead to the decrease of squid production. Currently, the most researches of squids focused on the relationship between catches of torch-light fishery and fishing environments, as well as biological study of squids which caught by torch-light fishery. Trawl fishery is also one of the main fisheries that caughtes squids. The results showed the distribution range of mantle length in trawl fishery (1.8~40.82cm) was wider than the range of torch-light fishery (2.1~32.9cm). The sex ratio showed the squids caught by torch-light fishery had more males with significant sex difference. The monthly variation of GSI showed that both area of the male squids had a peak value in spring and autumn. In addition, the results of mantle length at 50% sexual maturity excluding spring showed the squids caught in trawl fishery were bigger than torch-light fishery. Exponential and power growth models explained the fit to the size-at-age data to a similar extent. Alternatively, to observe the he sword tip squid sample in the northeastern water of long-term changes. And the year of average mantle length almost 90mm are not change more in 2001 to 2012. The average of weight is clearly go down in 2001 to 2007. But, In 2008 get high and in 2009 to 2011 also decline. In terms of the abundance index ,it begin period joined by 2002 to 2006 and part of year in which it is added. The activity of squid half of 2012. To catch the fisheries of squid include trawl fishery, gillnet fishery, torched-light net fisheries, danish seine net fishery, porgy and miscellanous fish long line, pole and lines boote, and troll line fisheries.It has 236 sample vessels totally. Among the catch of squid, the trawl fishery catch 251ton and torched-light net fisheries catch 224ton. The CPUE of vessels concentrate in northeastern, west and Penghu waters.Then the distribution of northeastern water is the most widely. The distribute of torched-light net fisheries’s operation is extending from south of 26°N to west waters ,and distributed all the western waters. And the operate of pole and lines boote is mainly in the waters off Penghu. The catches and effort’s distribute is similar in offshore and coastal fisheries. However the CPUE’s waters of trawl efficiency is highest from part of south 25°N to Yun-Chang Rise. The fishing lamps of offshore and coastal fisheries is used overview then the useful part is in northeastern of Taiwan ( mean lamp 44). And the used of ton class emerges of exponential increase, CT0 to CT6’s average lamp are total in 10.4 - 98.1   Keywords: squids, waters off northeastern Taiwan, trawl fishery, t orched-light net fisheries, fishing lamps.
計畫編號 102農科-11.2.1-漁-F2(5)
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