MORPHOMETRIC ANALYSIS OF THE ATLANTIC ALBACORE POPULATIONS MAINLY HER EASTERN AREAS
MORPHOMETRIC ANALYSIS OF THE ATLANTIC ALBACORE POPULATIONS MAINLY HER EASTERN AREAS
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主要是东部地区的大西洋长鳍金枪鱼种群的形态分析
DOI：
10.2331/suisan.31.333
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发表时间：
1965
期刊：
影响因子：
--
通讯作者：
T. Ishii
中科院分区：
文献类型：
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作者：
T. Ishii
大西洋长鳍金枪鱼Thunnus alalunga（BONATERRE）是一种分布广泛的长鳍金枪鱼。作者从六个方面对该鱼进行了形态计量学分析，这是在渔业生物学领域的首次贡献。本报告中使用的数据见表1。作者于1960年9月至1961年2月在“Shoyo Maru”号考察船上对大西洋东北部（样品A）和东南部（样品B）的样品进行了测量。将来自6个地点的标本按站位在9个相对体长上进行相互比较（图2）。结果表明：1）同一地区的标本（标本A）在头长和胸长上存在一定的性别差异。然而，可以说，这种差异与局部差异相比并不显著，正如SCHAEFER（1948）和KUROGANE（1960）已经指出的那样。2)东北部和东南部地区的标本之间的局部差异可以明显看出。东北部的标本头较短，第一和第二背鳍、肛门和骨盆的前鳍比东南部的标本多（表4，图4）。3)与西大西洋鱼类相比，东大西洋鱼类的头较长，腹鳍较多，第一和第二背侧肌较多。在此必须指出，这些差异可能是由于季节性或技术差异造成的。4)形态计量学证据表明，大西洋东部至少存在两个种群，而大西洋西部的种群则无法讨论。
The Atlantic albacore, Thunnus alalunga (BONNATERRE), is distributed abundantly almost all the round. The author gives morphometrical analysis on this fish from six areas (Fig. 1), which seems the first contribution in this field of fishery biology. Data used in this report are shown in Table 1. Specimens from northeastern (Sample A) and from southeastern (Sample B) Atlantic are measured as soon as possible by the author on board the research vessel, Shoyo Maru, from September 1960 to February 1961, Certain portions on body are measured in mm. using slide calipers as proposed by MARR and SCHAEFER (1949). These specimens from the six localities are compared each other by stations on the nine relative lengths to body length (Fig. 2). The results get here are summarized as follows: 1) The specimens from the same area (Sample A) show some sexual differences in head and pectoral lengths. It may be said, however, such differences are not significant, as compared with the local ones, as suggested already by SCHAEFER (1948) and KUROGANE (1960). 2) The local differences between specimens of the northeastern and southeastern areas may be obviously recognized. The northeastern specimens have shorter head, more front fins of the 1st and 2nd dorsals, anal and pelvic than do the southeastern ones (Table 4, Fig. 4). 3) In comparison with the western Atlantic fish, the eastern ones have longer head, more hear pelvic, and more front 1st and 2nd dorsals (Fig. 5). It must be noted here that these differences can be due to seasonal or technical variations. 4) The morphometrical evidences here obtained show that in the eastern Atlantic at least two populations may be found, while the western population can not be discussed.