WEKO3
アイテム
日本産のホシザメとシロザメの生殖に関する研究
https://fra.repo.nii.ac.jp/records/2011445
https://fra.repo.nii.ac.jp/records/2011445765db9dd-c779-467b-a4ba-8699f1b929b0
| アイテムタイプ | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||
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| 公開日 | 2024-10-11 | |||||||||||
| タイトル | ||||||||||||
| タイトル | 日本産のホシザメとシロザメの生殖に関する研究 | |||||||||||
| 言語 | ja | |||||||||||
| タイトル | ||||||||||||
| タイトル | studies on the reproduction of Japanese smooth dogfishes, Mustelus manazo and M. griseus | |||||||||||
| 言語 | en | |||||||||||
| 言語 | ||||||||||||
| 言語 | eng | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||
| アクセス権 | ||||||||||||
| アクセス権 | open access | |||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||||
| 著者 |
手島, 和之
× 手島, 和之
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Since Mustelus manazo and M. griseus closely resemble each other in general appearance, these smooth dogfishes were consistently confused by previous workers in classification. The detailed studies on the reproductive organs and reproductive patterns in these two species revealed some remarkable differences between them. Especially, reproductive patterns are distinctly different, i.e., M. griseus is placental viviparous species, though M. manazo is non-placental species. General reproductive characters of these two species are summarized as follows : Female : 1. The female reproductive organs in both species consist of the ovary. oviduct, nidamental gland and uterus. Eggs ovulated from the ovary are received through the common ostium and distributed to both oviducts. Fertilization takes place in the nidamental gland, and a fertilized egg enclosed in an embryonic membrane descends into the uterus to develop into an embryo. The size of the egg at ovulation is about 20mm in diameter in M. manazo and about 15mm in M. griseus. 2. In both species ovulation and fertilization occur during the period from July to August, and embryos of about 300mm in total length are born during the next April and May. Gestation period in both species in therefore estimated to be about ten months. 3. In M.griseus the placenta is established when the embryo is about 150mm in total length, and the embryo is nourished by both yolk and mother after establishment of the placenta. In M. manazo the placenta is not formed throughout the whole stage of gestation. The M. manazo embryo therefore seems to be nourished by yolk until paturition. The internal yolk sac is formed in the M. manazo embryo while it is not formed in the M. grisens embryo. 4. In both species an embryo enclosed in an embryonic membrane is contained in each uterine compartment. The number of embryos per litter increases with adult length in both species. 5. Female M. manazo is estimated to reach maturity at the total length between 630 and 700mm, and the size at maturity in female M. grisens is estimated to be between 680 and 760mm in total length. Male : 1. The male reproductive organs in both species consist of the testis, epididymis, spermiduct, seminal vesicle, siphon sac and claspers. Spermatozoa, produced in the testis, are accumulated in the seminal vesicle after passing through the epididymis and spermiduct. During mating spermatozoa are sent into the uterus through the clasper groove. 2. In both species the value of the gonad index reaches the maximum in November and December, and reaches the minimum in June to July, when the spermatozoa discharge (mating) occurs. The mating season agrees with the ovulating season. In both M. manazo and M. griseus, ovulation, mating and fertilization thus take place during the period from June to August. 3 The clasper is the copulatory organ and is formed by a modification of the pelvic fin. A clear difference is found in the distal portion of the clasper skeleton between the two species; in M. manazo, the inner terminal cartilage is as long as the outer terminal cartilage while in M. grisens, the inner terminal cartilage is markedly longer than the outer terminal cartilage. The clasper skeleton is formed when the shark is between 620 and 650mm in total length in M. manazo and between 720 and 750mm in M. griseus. 4. In both species the siphon sac is formed in the ventral region. During mating, spermatozoa, pushed out of the urino-genital papilla, seem to be ejected into the uterus through the clasper groove by the flush of water from the siphon sac. 5. Male M. manazo is estimated to reach maturity when the shark is between 600 and 650mm in total length, and male M. grisens is estimated to reach maturity at the total length between 700 and 750mm. |
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| 言語 | en | |||||||||||
| 書誌情報 |
ja : 水産大学校研究報告 en : The Journal of the Shimonoseki University of Fisheries 巻 29, 号 2, p. 113-199, ページ数 87, 発行日 1981-01-20 |
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| 出版者 | ||||||||||||
| 出版者 | 水産大学校 | |||||||||||
| 言語 | ja | |||||||||||
| 出版者 | ||||||||||||
| 出版者 | the Shimonoseki University of Fisheries | |||||||||||
| 言語 | en | |||||||||||
| ISSN | ||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 0370-9361 | |||||||||||
| 書誌レコードID | ||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AN00124678 | |||||||||||
| 情報源 | ||||||||||||
| 識別子タイプ | Local | |||||||||||
| 関連識別子 | fishu_k_29_113 | |||||||||||
| 関連サイト | ||||||||||||
| 識別子タイプ | URI | |||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010233592 | |||||||||||
| 言語 | ja | |||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||
