農業部水產試驗所全球資訊網

花腹鯖 (Scomber australasicus) 是臺灣鯖鰺漁業中最重要的魚種。本研究分析2020~2023年間取得鯖魚成魚生殖生物學參數，從生殖腺指數與繁殖活躍度的月別變化，推論花腹鯖應以3月/4月為主要繁殖期，且繁殖活躍度越高的花腹鯖族群，其雌魚占比會越低。相較於一支釣，夜間作業之扒網捕到的花腹鯖雌魚有較高比例為繁殖活躍個體，且僅在夜間能捕抓到呈水卵雌魚。推論花腹鯖應屬夜間產卵魚種，當夜產卵個體會脫離非產卵群，上浮至表水層產卵，形成以雄魚為主的產卵群。魚卵生產模式的參數取得方法與實用性可加深瞭解目標魚種生殖生物學特色，並對經營管理提供建議。

摘要abstract(英) The blue mackerel (Scomber australasicus) is the most important species supporting Taiwan’s mackerel fisheries. This study provides the reproductive biology parameters of adult mackerel caught from 2020 to 2023. Based on monthly changes in the gonadosomatic and breeding indexes, we deduced that the main spawning period for blue mackerel is from March to April. The proportion of female blue mackerel in a school decreases as their reproductive state progresses. Actively spawning females are caught more often by Taiwanese seines at night than by hook and line during the daytime. Here, all fish with ovaries containing hydrated oocytes were collected at nighttime. These results suggest that blue mackerel is a night-spawning species. Fish that breed at night move to the water surface and release gametes away from non-mating schools, resulting in a male-dominated school. These findings enhance our understanding of reproductive biology in target fish populations and will help manage these fisheries.