魚類学雑誌
Online ISSN : 1884-7374
Print ISSN : 0021-5090
ISSN-L : 0021-5090
The Influence of Sex Hormones on the Reproductive Organ of a Sôgyo “ Ctenopharyngodon idellus (C. and V.”)
N.Y. KAWAMOTO
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ジャーナル フリー

1950 年 1 巻 1 号 p. 8-16

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抄録
Since 1940, the author had given the hydrosol of Androsteron and Esteron to Sôgyo, Ctenopharyngodon idenus with undeveloped sexual gland and by 1949, gained the following results:
1. The sexual 'glands of males and females of C. ideilus were fully developed by giving hormones through the medium of the mouth with food processed. However the artificial fertilization was not successful.
2. The spawning season of C. idenus at Hikone in Shiga Prefecture was found to be from April to July, and during the period pearl organs appeared on the surfaces of the fins of males.
3. Judging from the fact that large C. ideiius were often captured along the shore of Lake Biwa, they seemed to come towards the shore for spawning. But, their sexual glands were far less developed than those of the fishes which were given hormones.
4. Consequently, the author concluded that it was wise and proper for the propagation of C. idenus to set free the fishes after sexual glands had fully grown as the result of hormones given in the test pond.
The author wishes to express gratitude to the Education Ministery for giving a part of the Scientific Research Fund to his Project. This experiment was made possible by the co-operation of Mr. Moritô Kikuchi, former governor of Shiga Preiecture, Mr. Seizô Suzuki, head of the Shiga Prefectural Fisheries Experimental Station and his fellow officials, Mr. Kôtaro Yamanaka, Hyogo Prefectural Engineer, Dr. Tadao Satô Professor at Nagoya University and Mr. Tôji Nakamura, owner of of the Nakamura Fish Farm. The author also wish to express appreciation to Dr .Masao Migita, official of the Fisheries Experimental Station of the Agriculture and Forestry Department for his supplying materials.
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© The Ichthyological Society of Japan
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