巻号一覧
14 巻, 3 号
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Variation of Anal FinTokiharu ABE1949 年 14 巻 3 号 p. 123-144
発行日: 1949/01/30
公開日: 2008/02/29
ジャーナル フリーAlthough as a rule smaller in size, the anal fin of the puffers bears a general resemblance to the dersal fin offering good taxonomic criteria. In this paper the variation of the former will be treated of from the point of view of taxonomy in nearly the same method as that adopted in dealing with the variation of the latter (Abe, 1944).抄録全体を表示PDF形式でダウンロード (1977K) -
鱗の成長機構に關する一つの示唆最首 光三1949 年 14 巻 3 号 p. 145-148
発行日: 1949/01/30
公開日: 2008/02/29
ジャーナル フリーSakiyama (1942) reported the supplementary scales in 3 species of Japanese fish. The present writer, dealing with 7 species, Saurida undosquamis, Sphyraena pinguis, Pagrosomus major, Sardinia meranosticia, Nibea mitsukurii, Sebastolobus macrocher, and Nemipterus virgatus, found that these scales are variable in size and shape, and the position referring to the ordinary scales is in consistent. For Sardinia melanosticta the scales were studied in detail on the mechanism of its formation, and conclusion was reached as follows;
(1) The supplementary sca'es derive directy from the ordinary scales.
(2) Therefore, the tissue of the sca'es, at least on the surface, is not inactive but vivified.
(3) Corollary is that the formation of the fish scales is not indused by the Reisegungs phenomenon as supported by M. Graham (1928), A. W. Morozov (1924), Aikawa (1941), and Yamaha (1929).
In the light of the present experience the writer gave a hint on the standarized method of age determination by scales, wherein the organology of the external covering of the fish has not been much dealt.抄録全体を表示PDF形式でダウンロード (226K) -
佐藤 榮, 田中 江1949 年 14 巻 3 号 p. 149-154
発行日: 1949/01/30
公開日: 2008/02/29
ジャーナル フリーBased on the yearly catches of spring herring and several kinds of migratory fishes of the warm current-system in Hokkaido, in the year from 1887 to 1946, the factors which might be related to the fluctuation of herring catches were examined statistically.
It was suggested that the reciprocal variation of herring catches at dfferent places in the neighbourhood of Hokkaido seemed to be related to the hydrogra phical condition of Tusima-Current which looked like to fluctuate periodically. To say the least, the variation of the geographical distributions of spring herring in Hokkaido, which showed from early part of “Showa” onwards, might be accounted for by the hydrographical factors.抄録全体を表示PDF形式でダウンロード (426K) -
吉原 友吉1949 年 14 巻 3 号 p. 155-160
発行日: 1949/01/30
公開日: 2008/02/29
ジャーナル フリー1. Effect of variations of water temperature on the growth rate.
It is believed that the rings on the scale, otolith and centrum of vertebral bone are formed annualy by the cyclic variation of water temperature. Then, if we culture fishes in water of constant temperature, scale rings will not be formed. In order to ascertain this point, I kept trouts at Oizumi experimental station of Tokyo College of Fisheries (Long. 138°24' Lat. 35°50', Height 1000m) from April, 1943 to June, 1945. The result is shown in Table 1 and Fig. 2. From these results we can conclude that growth rate is not constant even if water temperature is constant. Consequently we can not assume that mechanism of ring formation are due to the variation of water only.
II. On the determination of death rate.
Few results of the determination of death rate of fish by rearing experiments are published. We can get the death rate of traut from the above experiment. I counted dead fish one by one every day and I got a 10 days total of them. The result is shown in Table 2 and Fig. 3-4.抄録全体を表示PDF形式でダウンロード (353K)
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