Reproduction and Food Habits of Kawakawa Euthynnus affinis in Taiwan

台灣海域產巴鰹之生殖與食性研究

邱萬敦(Wann-Duen Chiou) ； 鄭利榮(Lei-Zong Cheng) ； 陳凱暐(Kai-Wei Chen)

《臺灣水產學會刊》 31卷1期 (2004/03) Pp. 23-38

https://doi.org/10.29822/JFST.200403.0003

摘要

本研究乃調查台灣海域產巴鰹(Euthynnus affinis)之生殖和食性，於1995年至2001年期間共採集了981尾由定置網和扒網漁獲之巴鰹，根據卵細胞組織學、生殖腺指數和卵徑大小組成等特徵，顯示巴鰹的產卵期在4月至8月，產卵盛期在7月，其最初性成熟體長為尾叉長48公分，每尾成魚平均產卵數估計為487, 205±161, 191卵粒。巴鰹為魚食者(piscivore)，未成熟之小型魚主要以沿海盛產之魩鱙和七星魚為食，而成熟的大型魚雖也攝食此等餌食，但較喜愛攝食較大型之魚類如鰺類和花腹鯖。

關鍵字

巴鰹 ； 生殖 ； 食性 ； 台灣

並列摘要

This study provides information on reproduction and food habits of kawakawa Euthynnus affinis in Taiwan. A total of 981 kawakawa caught by set net and small purse seine were collected during 1995-2001. Three methods, histology, gonadosomatic index and oocyte diameter frequency distribution suggested that the spawning season was from April to August with the peak in July. Size at first maturity of female kawakawa estimated from the Logistic model was 48 cm fork length. Mean batch fecundity (± SD) was estimated to be 487, 205±161, 191. Kawakawa is a piscivorous feeder. The most important prey items of the immature smaller kawakawa were the local teeming prey fish such as larval anchovy and lanternfish. The matured larger fish were preferable fed on larger-sized prey fish such as Decapterus spp, Scomber australasicus although they also depended on the small-sized local teeming prey fishes.

並列關鍵字

Euthynnus affinis ； Reproduction ； Feeding habit ； Taiwan