カワチブナの鱗の隆起線形成について

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The writers made investigation into the ridge formation on the scales of the Kawachi-buna. The fish were reared in the fishpond of our university for a period of about one year after being hatched. Thereafter, they were divided into two groups: one group of fish were reared successively in the same fishpond, and the other group were transeferred to the Osaka Prefectural Freshwater Fish Experiment Station and reared in the fishpond. The environmental conditions were comparatively more favorable in the latter fishpond than in the former. The samples were caught in these two fishponds during the period from August, 1966 to September, 1968 at certain intervals and compared with each other. The results obtained are summarized as follows. 1) The fish reared under the favorable condition grow more rappidly and have rather numerous ridges on the scales and comparatively longer scale lengths, as compared with the fish reared under the unfavorable condition. 2) Between the body length and the number of ridges on the scale, there can be seen a positive linear correlation, which is common in the two groups of fish reared under the different conditions. A similar correlation can be seen between the body length and the scale length, but the fish reared under the favorable condition have comparatively greater growth rate of the scale length after being transeferred. 3) The spaces between the ridges on the scale are rather stable throughout four seasons. However, in the case of the fish reared under the favorable condition, the spaces are somewhat wider, as compared with the fish reared under the unfavorable condition. 4) Particularly in the lateral region of the scale, several discontinuous or disturbed ridges occurred annually, and therefore they would be applicable to the annual ring. However, none of such an annual ring appeared throughout a year, when the fish had been reared under the unfavorable condition.
近畿大学の論文
1972-03-15

カワチブナの鱗の隆起線形成について

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