Age and Growth of Common Mackerel (Scomber japonicus) in the Waters of Northeastern Taiwan, with Particular Reference to the Subpopulation Discrimination

臺灣東北部海域白腹鯖之年齡、成長及其族羣判別

谷瑞峯(Jui-Feng Ku) ； 曾萬年(Wann-Nian Tzeng)

《臺灣水產學會刊》 12卷2期 (1985/12) Pp. 1-11

https://doi.org/10.29822/JFST.198512.0001

摘要

爲了瞭解澎佳嶼～釣魚臺海域白腹鯖來遊羣之年齡成長及其族羣構造，本研究自1981年7月至1983年10月於蘇澳漁市場採集在該海域作業之大型圍網漁船所捕獲白腹鯖，以胸鰭附近之鱗片當做年齡形質，來研究其年齡及成長。白腹鯖之鱗長～體長關係爲L=124.759＋114.943R。每年1~2月時形成一個年輪。產卵期爲2~3月。一年魚之尾叉長估計爲217.9±9.2mm，二年魚爲268.5±13.7mm。體長與體重之關係爲W=40.0967×L^(3.2028)×10^(-7)。本海域白腹鯖之成長比中國東海及日本海南部各系羣爲慢。由成長的傾向來看，澎佳嶼～釣魚臺海域之白腹鯖與中國東海南部羣可能爲同一族羣。

並列摘要

Age and growth of common mackerel, Scomber japonicus (HOUTTUYN), from the waters off Pengchiahsu and Fishing Islands in northeastern Taiwan was studied by means of scale reading of 613 specimens collected from SU-AO fish market during the period from July 1981 to October 1983. The relationship between scale radius (R) and fork length (L) was represented by the equation, L=124.759+114.943R. The age ring mark was formed once a year during January-February when the water temperature was lowest and the gonad condition of the fish was in maturity stage prior to the spawning season. The back calculated fork length of one-year-old fish was 217.9±9.2mm while that for two-year-old one was 268.5±13.7mm. The length (mm) and weight (gm) relationship was estimated as: W=40.0967×L^(3.2028)×10^(-7).
Judging from the information on the pattern of ring radius and age-length relationship, it is suggested that the common mackerels occurring around Pengchiahsu and Fishing Islands are the migrating groups of the south East-China-Sea subpopulation as proposed by Ōuchi and Hamasaki (1979).