Changes in plasma levels of steroid hormones during sexual maturation of male red seabream Pagrus major.
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- Ouchi Kazuomi
- National Research Institute of Aquaculture/Nansei Regional Fisheries Research Laboratory
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- Adachi Shinji
- National Institute for Basic Biology
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- Nagahama Yoshitaka
- National Institute for Basic Biology
Bibliographic Information
- Other Title
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- マダイ雄の性成熟に伴う血中ステロイドホルモン量の変動
- マダイ オス ノ セイ セイジュク ニ トモナウ ケッチュウ ステロイド ホル
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Abstract
Changes of plasma testosterone, 11-ketotestosterone and 17, 20β-dihydroxy-4-pregnen-3-one (17α, 20β-diOHprog) levels were correlated with changes in gonadosomatic index (GSI) and testi-cular histology during the sexual maturation of male red seabream Pagrus major.<br>A sharp increase in the GSI occurred during April, with the increased formation of sperma-tozoa. High GSI values were maintained in May, followed by a sharp drop in June. The values were consistenily low during the remainder of the sampling periods. Plasma testosterone levels were maintained at low levels (below 200pg/ml) from January to March, rapidly increased to 500pg/ml in April and reached a peak of 870pg/ml in May. The levels showed a distinct drop in June, and remained low throughout the remainder of the sampling periods. The profiles and absolute levels of plasma 11-ketotestosterone were almost similar to those of testosterone. 17α, 20β-diOHprog could be detected in plasma throughout the sampling periods, but the levels (about 200pg/ml) were much lower than those of salmonids. There was a slight but significant increase in l7α, 20β-diOHprog levels (350pg/ml) in males collected during early spermiating period (April). However, the levels decreased even during the period of active spermiation (May).
Journal
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- NIPPON SUISAN GAKKAISHI
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NIPPON SUISAN GAKKAISHI 54 (4), 593-598, 1988
The Japanese Society of Fisheries Science
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Keywords
Details 詳細情報について
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- CRID
- 1390282681391340544
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- NII Article ID
- 130001544415
- 20000539695
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- NII Book ID
- AN00193422
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- ISSN
- 1349998X
- 00215392
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- NDL BIB ID
- 3187036
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed