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臺灣西南海域扒網漁業資源調查

  • 日期:111-10-24
  • 計畫編號:110農科-6.1.2-水-A2(3)
  • 年度:2021
  • 領域:漁業科技研發
  • 主持人:何珈欣
  • 研究人員:翁進興、藍揚麒、賴繼昌、黃星翰、陳秋月、黃婉綺、吳伊淑、林堉琪

白腹鯖(Scomber japonicus )為跨海域洄游性魚種,為了解臺灣西南海域洄游之白腹鯖,進行白腹鯖生殖生物學研究。本研究自2020年11月至2021年10 月,定期採集臺灣西南海域捕獲之白腹鯖生物樣本研究期間共採集 692尾,雌魚305尾 ,雄魚 387尾,進行生殖成熟之分析。透過生殖腺指數之月別推移得知,11~4月為白腹鯖之生殖季節,2~3月為產卵高峰期。本魚種雌雄魚50%性成熟體長分別為213.67 mm FL與215.59 mm。另外利用漁獲交易紀錄及漁獲魚種營養位階(TL),評估2012~2020年間高雄林園地區扒網漁獲物平均營養位階(MTL)、漁獲魚種貢獻度(CTL)及漁獲平衡指數(FiB)的變化趨勢。本研究2012~2020年間扒網漁業MTL 3.63~3.97,此一海域之海洋食物網之平均營養位階變動未有每年呈現下降情形。由2012~2020年間FiB值皆大於0,且由CTL分析之結果顯示,主要漁獲的目標魚種包含眼眶魚 (TL = 3.5)、正鰹 (TL =4.3)、圓花鰹 (TL = 4.1)、黃鰭鮪 (TL = 4.3) 等。

研究報告摘要(英)


Chub mackerel (Scomber japonicus) is a straddling fish stock commonly utilizedby Taiwan. We carried out the present reproductive biology study for chub mackerel in the southwest Taiwan.We collected chub mackerel samples monthly from the catch in the southwest waters off Taiwan during November, 2020- October 2021. A total of 692 valid samples were used in this study, including 305 females, 387males. These samples were used to conduct reproduction and maturation for the stock. The major results were summarized as follow: The Gonosomatic Index (GSI) indicated that spawning period of chub mackerel were between November and April. Mean while, the gonad histology indicated that the female chub mackerel reached a high maturity rate in February to March, which implied that the spawning period, peaked around that time.Based on a logistic model, sizes at 50% of maturity were 213.67 and 215.59 cm in FL for female and male specimens, respectively. The mean trophic level (MTL), contribute tropic level (CTL) and fishing-in-balance (FiB) were estimated by the landings data from the Linyuan Fishermans Association in Kaohsiung. In this study, the Taiwanese-seine by the MTL 3.63~3.97 from 2012 to 2020.The FiB value is greater than 0,the Contribute trophic level (CTL) shows that target fish species for the main catch include Mene maculate(TL = 3.5)、Katsu wonus pelamis (TL = 4.3)、Auxis rochei(TL = 4.1) and Thunnus albacares(TL = 4.3).