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臺灣近海花腹鯖產卵親魚量之試算

  • 出版日期:111-06-30
  • 標題title(英):
    An Estimate of the Spawning Biomass of the Blue Mackerel (Scomber australasicus) in the Coastal Waters of Taiwan
  • 作者:陳瑞谷‧黃鼎傑‧王友慈
  • 作者auther(英):Ruei-Gu Chen, Ting-Chieh Huang and Yu-Tzu Wang
  • 卷別:30
  • 期別:1
  • 頁碼:1-13

花腹鯖 (Scomber australasicus) 是臺灣沿近海漁業主要漁獲物種,因過漁徵候出現已導入管理措施。本研究是臺灣首次實際運用日魚卵生產模式 (daily egg production method, DEPM) 來推估花腹鯖產卵親魚量。2020年4月在臺灣東北海域 (宜蘭灣) 同時取得大量的魚卵與成魚樣本,從845尾花腹鯖成魚計算出批次成熟雌魚平均全魚濕重為528.0 g,性比為0.472,平均個體孕卵數為43,733 eggs/fish,當日產卵比例為0.1335。在東澳灣口與龜山島東方海域採集到高豐度的花腹鯖魚卵,推估產卵場面積為1.71×109 m2。從胚胎發育特徵推測產卵高峰約在20:00–21:00間。利用指數衰減模式推估此時單位面積產卵數約為38.3或52.7 eggs/m2。初步推估花腹鯖宜蘭灣產卵群4月殘存量約在8,395–23,090 mt之間。可知日魚卵生產模式雖能用來推估花腹鯖產卵資源量,惟仍需增加DEPM各參數精確度與準確度及花腹鯖生殖生態學知識,以拓展未來實用價值。

摘要abstract(英)


The blue mackerel (Scomber australasicus) is a key target species of Taiwan nearshore fisheries, and management measures have been implemented for this species following evidence of overfishing. This paper describes the first test application of the daily egg production method (DEPM) to estimate the spawning stock biomass of S. australasicus in Taiwan. Large numbers of eggs and adults were collected concurrently from Yilan Bay off northeastern Taiwan during April 2020. From a total of 845 adult fish, the mean weight of the mature female fish was 528.0 g, the sex ratio was 0.472, the mean batch fecundity was 43,733 hydrated oocytes and the spawning fraction was 0.1335. The highest density of eggs was recorded in the waters off Dong’ao and in the eastern area off Guishan Island, and the estimated spawning area was 1.71 × 109 m2. The embryonic features of the eggs indicated that the peak spawning time was from 20:00 to 21:00. The mean daily egg production obtained using the exponential decay model was 38.3 or 52.7 eggs/m2. The preliminary estimates of the spawning biomass for Yilan Bay during April 2020 were between 8,395 and 23,090 mt. The results of this study demonstrate that the DEPM is suitable for assessing the spawning stock of S. australasicus. However, further research is required to improve the accuracy and precision of the DEPM key parameters and facilitate an understanding of the spawning ecology to enhance future applications.