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Year-Round Long Photoperiod (Ld 16:8) Suppresses Sexual Maturation in Masu Salmon (Oncorhynchus Masou)
https://fra.repo.nii.ac.jp/records/2010658
https://fra.repo.nii.ac.jp/records/2010658090dccad-5a41-49ac-a4cd-b9c946e39d6c
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Ozaki et al. Year round long photoperiod (LD 16 8) suppressed sexual maturation.pdf (2.6 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||
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| 公開日 | 2024-09-06 | |||||||||||
| タイトル | ||||||||||||
| タイトル | Year-Round Long Photoperiod (Ld 16:8) Suppresses Sexual Maturation in Masu Salmon (Oncorhynchus Masou) | |||||||||||
| 言語 | en | |||||||||||
| 言語 | ||||||||||||
| 言語 | eng | |||||||||||
| キーワード | ||||||||||||
| 言語 | en | |||||||||||
| 主題Scheme | Other | |||||||||||
| 主題 | Fsh; Lh; Histology; sex steroid hormone; Gene expression | |||||||||||
| 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 | journal article | |||||||||||
| 著者 |
尾﨑, 雄一
× 尾﨑, 雄一× 鈴木, 博史× 山口, 寿哉× 風藤, 行紀× 泉田, 大介× 戸川, 富喜
× 奥澤, 公一 |
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Mariculture industries for several salmonid species have been expanded in many areas in Japan. Endemic masu salmon (Oncorhynchus masou) is among them and is promising due to its scarcity value and good taste. However, early sexual maturation before harvest size is a major issue because it results in substantial economic loss due to the retardation of somatic growth. Therefore, methods for delaying or inhibiting early maturation need to be established. To accomplish this, countermeasures for sexual maturation using photoperiod manipulation were studied. Under-yearling (10-month-old) smolts were reared under three experimental regimes in fresh water from summer (August 2019) to autumn in the next year (September 2020) as follows: simulated natural photoperiod (SNP group), constant long photoperiod at LD 16:8 (LP group), and alternating photoperiod between long (LD 16:8, from August to October 2019 and from April to July 2020) and short (LD 8:16, from October 2019 to April 2020) ones (LSP group). Ten to 40 fish from each group were sampled at a 12-week interval and the gonadosomatic index, gonadal histology, serum sex steroids, and gene expressions of two gonadotropins, namely the follicle-stimulating hormone (Fsh) and luteinizing hormone (Lh), beta subunits (fshb and lhb) in the pituitaries were examined to assess sexual maturation. Rearing under constant long photoperiod (LP group) strongly inhibited the gonadal maturation of salmon. Meanwhile, most fish in the SNP and LSP groups started vitellogenesis or spermatogenesis in July 2020. The continuous long photoperiod also suppressed the increase of the fshb and lhb expression levels and serum levels of 17β-estradiol in females and 11-ketotestosterone in males. This inhibition of sexual maturation through a long-term long photoperiod is applicable for masu salmon aquaculture. | |||||||||||
| 言語 | en | |||||||||||
| 書誌情報 |
en : Aquaculture 発行日 2024-03-28 |
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| 出版者 | ||||||||||||
| 出版者 | Elsevier | |||||||||||
| 言語 | en | |||||||||||
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| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 0044-8486 | |||||||||||
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| 関連タイプ | isIdenticalTo | |||||||||||
| 識別子タイプ | Local | |||||||||||
| 関連識別子 | 23334001 | |||||||||||
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| 関連タイプ | isIdenticalTo | |||||||||||
| 識別子タイプ | URI | |||||||||||
| 関連識別子 | https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4776690 | |||||||||||
| 言語 | en | |||||||||||
| 関連名称 | SSRN | |||||||||||
| 著者版フラグ | ||||||||||||
| 出版タイプ | SMUR | |||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_71e4c1898caa6e32 | |||||||||||
