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カサゴの研究―1 生殖巢熟度の変化について


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Title: カサゴの研究―1 生殖巢熟度の変化について
Other Titles: Studies on a Scorpaenous fish Sebastiscus marmoratus CUVIER et VALENCIENNES―I On the Monthly Variation of Gonad Maturity
Authors: 水江, 一弘
Authors (alternative): Mizue, Kazuhiro
Issue Date: 28-Feb-1957
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.5, pp.27-29; 1957
Abstract: In Sasebo Bay, we caught many specimens of "kasago" Sebastiscus marmoratus CUVIER et VALENCIENES for four years and measured their total length, body weight and gonad weight, and at the same time we sampled the scales, otoliths and gonads. As their fishing were in every months, I studied them from many view-points. There are few information about the reproductive behavior of ovoviviparous fishes. As a result of this study, the following articles were cleared about this ovoviviparous fish in Sasebo Bay. 1) In males, the weight of testis shows maximum value between August and October, while in females, the ovary was in the most matured condition and the most larvae were discharged between December and February. 2) The mature period of gonad was different in both sexes. After about four months of the maturity of testis, ovary was matured. This fact is distinguished from ordinary oviparous fishes, and it can be infered that the testis of male was matured and give the sperm to female by a certain copulatory organ and the sperm maintains in the female's body for four months until the ovum is matured and fertilized. 3) It seems that fertilization of ovum and discharge of larvae does not occur in the same time. / 1)1953年2月~1956年10月まで佐世保湾内において実習によつて毎月採集したカサゴを材料として,その生殖巣熟度の変化を雌雄夫々月別に検討した。2)雄の精巣においては8月~11月,その重量が高く,最盛成熟期は8月~10月の3ケ月であり,雌の卵巣が完熟して稚魚を排出する時期は11月~3月であり,その最盛期は12月~2月の3ケ月である。3)体内受精を行う魚であるカサゴにおいて雌雄の生殖巣の熟する時期が大体4ケ月ずれている。これは先ず雄の精巣が熟し,ある交接器で雌に精虫を与へ,雌はそれを受けて長期間体内に保存して自己の卵巣内において受精させると推察される。4)雌の卵巣中に発眼せる稚魚を持つているものを観察すると,卵巣内卵の一部のみが発眼していて,他のものは普通の透明卵である。これはカサゴが一度に稚魚を放出するのではなくて,ある程度時間をかけて何度かに分けて受精,放出,を行つているという事を物語つていると思う。
URI: http://hdl.handle.net/10069/31941
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第5号

Citable URI : http://hdl.handle.net/10069/31941

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