印度洋黃鰭鮪的年齡、成長和族群構造

Age, Growth and Population Structure of the Indian Yellowfin Tuna

黃哲崇(Che-Chung Huang) ； 孫寧(Ling Sun) ； 楊榮宗(Rong-Tszong Yang)

《臺灣水產學會刊》 2卷1期 (1973/06) Pp. 16-30

https://doi.org/10.29822/JFST.197306.0002

摘要

(1)太平洋和大西洋鱗徑和體長的關係如Fig.2所示。
(2)鱗徑及年輪徑的大小，太平洋大於印度洋，而印度洋內則有自西向東遞增之傾向。
(3)李氏現象在太平洋和印度洋都很顯著。
(4)年輪每年形成二次，時間為2～4月及8～10月。
(5)有關成長的parameters如下：
太平洋K=0.386 L(下标 ∞)=174.9 t0=0.05
東印度洋 K=0.278 L(下标 ∞)=212.7 t0=-0.19
中印度洋 K=0.290 L(下标 ∞)=215.6 t0=-0.01
西印度洋 K=0.349 L(下标 ∞)=191.1 t0=0.06
(6)由釣獲率的分佈、體長組成和其他生物學資料及以往之結果加以綜合分析，顯示印度洋的黄鰭鮪可分為東、西兩個族羣，一為以班達海和小巽他羣島附近海域為中心的東方羣，另一則以西部印度洋赤道流域為中心的西方羣。此兩羣在100°E附近發生混合交流。當北半球的夏天時，此混合交流的現象較為顯著。
(7)東部羣和西部太平洋赤道海域的黄鰭鮪在班達海也有某些程度的混合交流現象。

並列摘要

For study of age and growth and identification of population structure of yellowfin in the Indo-Pacific area, scales were collected and investigated along with catch statistics. The results obtained revealed that: (1) the Pacific yellowfin has larger ring-radii as well as scale size than the Indian Yellowfin;(2) the specimens from the western Indian have larger value in scale size and ring-radii than those from eastern Indian; (3) there is a significant difference in the estimated growth curves between male and female for the Pacific specimens, but not for the Indian specimens; and (4) it is convinced that there are two yellowfin groups in the Indian Ocean, viz., one concentrates in the western Indian and the other densely distributes in the waters around Sunda Islands and Banda Sea; intermingling of these two groups is supposed to be occurred around 100°E in the season of northern summer. Mixing occurs also between the fishes from Banda Sea and the western Pacific.