Studies on the life history of land-locked Ayu Plecoglossus altivelis in Lake Ikeda - I. Differences in the height of dorsal fin and body color between territorial and non-territorial Ayu Plecoglossus altivelis in Lake Ikeda.
Studies on the life history of land-locked Ayu Plecoglossus altivelis in Lake Ikeda - I. Differences in the height of dorsal fin and body color between territorial and non-territorial Ayu Plecoglossus altivelis in Lake Ikeda.
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池田湖内陆香鱼生活史研究——Ⅰ.池田湖领地性与非领地性香鱼背鳍高度及体色差异。
DOI：
10.2331/suisan.54.55
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Seirô Kimura
中科院分区：
文献类型：
--
作者：
K. Tachihara;Seirô Kimura
1981 ~ 1985年在鹿儿岛县池田湖对内陆Ayu Plecoglossus altivelis的生活史进行了观察。在本研究中，湖中未成熟成鱼的社会行为被识别为两种类型的阿玉。一种是领土型，另一种是非领土型。两种社会类型在背鳍形状和身体颜色图案上存在一定的差异。地盘鱼的后背鳍比非地盘鱼长，鳍膜较深。前者在鳃盖和身体前侧面有三个清晰的黄色椭圆形斑纹，后者只有一个斑纹，颜色苍白或暗淡。这些变异与体型和性别无关，而是与社会类型有关。有人认为，大而清晰的黄色标记是在领土所有者中承认其地位的信号，并表明所有者对非领土鱼类的统治。因此，这两种社会类型之间的差异为该物种的渔场评价提供了可能性。
Observations on the life history of land-locked Ayu Plecoglossus altivelis were made in Lake Ikeda, in Kagoshima Pref., from 1981 to 1985. In this study, two types of Ayu were recognized in its social behavior of immature adult fish in the Lake. One is territorial type and the other is non-territorial type. Some differences were found in the shape of dorsal fin and the color pattern of body between two social types. The territorial fish have longer posterior dorsal fin rays and darker fin membranes than those of nonterritorial ones. The former have three clear yellow oval marks on their gill covers and anterior body sides, however, the latter have only one mark and its coloration is pale or faint. Thesevaria tions are not related with body size and sexuality but with the social type. It is suggested that large and clear yellow marks are signal for recognition of their status among owners of territory and for showing the domination of owner to non-territorial fish. Thus, these differences between two social types of Ayu show a possibility of being applied to the evaluation of fishing ground of this species.