農業部水產試驗所全球資訊網

本研究於2022年4–9月在澎湖縣望安燈火漁業禁漁區周邊海域分別以棒受網及一支釣船進行樣本採集，探究該區燈火漁獲組成月間變動。結果顯示，春季以小鱗脂眼鯡 (Etrumeus micropus, Pacific round herring)、槍魷科稚體 (Loliginidae larvae) 為主；夏季物種交替頻繁，6月以白腹鯖 (Scomber japonicus, Pacific mackerel) 與臭肚魚科稚魚 (Siganidae larvae, rabbitfishes) 為主，7–8月則以平胸鈍腹鯡 (Amblygaster leiogaster, smooth-belly sardinella) 及黃小沙丁魚 (Sardinella lemuru, bali sardinella) 為主，其次為中國槍鎖管 (Uroteuthis chinensis, Taiwanese squid)。9月以黃小沙丁魚、藍圓鰺 (Decapterus maruadsi, Round scad) 及槍魷科稚體為主。禁漁區外因水深梯度大、流速快，豐富度與歧異度較低，4月以南洋美銀漢魚 (Atherinomorus lacunosus, hardyhead silverside)、槍魷科稚體為主，5–6月以白腹鯖、小鱗脂眼鯡為主，7月與8–9月分別以平胸鈍腹鯡、黃小沙丁魚為主。此外，禁漁區內以棒受網趨光誘集捕獲的稚體達21科，於4–6月及9月捕獲率達25% 以上；白腹鯖、藍圓鰺未達 50% 性成熟體長者約 46% 以上；中國槍鎖管體型明顯較一支釣小，已成熟比例亦相對較低。綜上觀察，禁漁區內為重要的魚介類繁殖場及孵育場，以棒受網趨光集魚捕獲體型有小型化的趨勢。此結果可供漁政管理單位現行法規修正參考。

摘要abstract(英) We collected specimens through vessels fitted with stick-held dip nets and pole and lines, from April to September 2022 to determine the monthly catch composition of the light fishery in the Wang-An light fishery forbidden zone. In the spring, the main species were Etrumeus micropus and Loliginidae larvae. In the summer, the predominant species were Scomber japonicus and Siganidae larvae in June, Amblygaster leiogaster and Sardinella lemuru in July and August (Uroteuthis chinensis was a minor catch in both months), and S. lemuru, Decapterus maruadsi, and Loliginidae larvae in September. Lower species richness and diversity were observed in the area outside the forbidden zone because of the high depth gradient and flow rate. The predominant species there were Atherinomorus lacunosus and Loliginidae larvae in April, S. japonicus and E. micropus in May and June, A. leiogaster in July, and S. lemuru in August and September. Moreover, the larvae belonged to up to 21 families, with catchability above 25% from April to June and September, employing stick-held dip nets around the fishing forbidden zone. More than 46% of S. japonicus and D. maruadsi were smaller than sexually mature specimens. Both the mantle size and sexual maturity ratios of the specimens caught by stick-held dip net fisheries were smaller than those caught by pole and lines ones, suggesting that the study area must be an important reproductive and nursery ground for these species. Our findings may facilitate the management of fisheries in this region