農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

本報告係自86年至100年之間，就東港、林園、梓官、茄萣等地區之拖網標本船所回收之漁況資料，予以進行研究分析台灣西南海域拖網標本船總漁獲量及單位努力漁獲量之歷年變動情形，此外，並針對100年度拖網標本船提供14,828網次之漁況資料進行分析漁獲組成及其季節之變動。
自90年後東港、梓官、茄萣等地區均有逐年增產之趨勢，尤其東港、梓官二地區則特別的明顯。東港、梓官、林園、茄萣等4個地區拖網標本船之漁獲組成中，以下雜魚漁獲量所佔漁獲比率極高，尤其，前三個地區在任何季節其漁獲比率高達近50%。東港、梓官、林園地區白帶魚均佔第二順位之漁獲量。
台灣西南海域大眼鯛從民國97年後之漁獲量有恢復增產之趨勢，而年平均體長亦隨之增加；大眼鯛幾乎周年都有產卵跡象，1~7月為其主要產卵期，而盛產卵期為2~4月，其雌雄別之最小性成熟體長分別為214.6、219.8mm。另大眼鯛之產卵海域分布於高雄至東港及小琉球東南方海域，亦即枋寮至枋山之間水深100公尺以上之海域。另於3、7月於東港、小琉球西南方及枋山等外海均有採集到大眼鯛之仔稚魚；大眼鯛之攝食種類時空變動不大，主要餌料種類為七星魚、櫻花蝦、海湖鰍科、刺蝦科、鰏科及中華玻璃蝦等。另大眼鯛於80及100年代之生殖特性與食性之時空變動沒有顯著差異，尤其是最小性成熟體長差異不大。

This paper purpose to analysis the spatio-temporal variation of catch which caught by trawl sampling vessels in Tungkang Linyuan, Tzguan, and Jiading areas from 1997 to 2011. Moreover, to analysis the catch composition and it’s seasonally variation which base on the 14,828 nets haul catch record data were collected from trawl sampling vessels in the southwestern areas of Taiwan. There is trend of the catch increasing every year in Tungkang Tzguan, and Jiading areas after 2001 and it were especially significant in Tungkang Tzguan areas. The trash fish was occupy a highest rate of the catch in in Tungkang Linyuan, Tzguan, and Jiading areas, and the rate of its catch is up to nearly 50% any season in the first three areas; White common hairtail (Trichiurus japonicus) accounts for second priority of the catch in Tungkang Linyuan, and Tzguan areas.
In the meanwhile, the variation of the annual catch and catch per unit effort (CPUE), the productive biology of Red bigeye fish (Priacanthus macracanthus) were studied. The catch has trend recovery increase of Red bigeye fish in the southwestern waters of Taiwan after 2011, and the annual average fork length increases with catch. Minimum body size at sexual maturity was estimated to be 214.6mm FL for females and 219.8mm FL for males. Red bigeye fish spawned very prolong, it take place during February and July with a peak of reproductive activity in January to April. It is suggested that the fish may be an multiple-batch, single spawner. The spawning ground was distributed in the waters between Kaohsiung and Tungkang, and the southeastern waters of Liuchium. Namely, the waters which above 100 m depth between Fanliao and Fanshan. There had caught the larvae of Red bigeye fish in the south western waters of Liuchium and the waters of Fanshan. The spatio-temporal variation was no significantly different of Food species. The main Food species were Benthosema pterotum, Sergia lucens, Bregmacerotidae, Oplophoroidea, Leiognathidae and Pasiphaea orientalis. There were no significantly different in reproduction and food of Red bigeye fish, especially, minimum body size at sexual maturity in 1992 and 2011.