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Titolo:
The involvement of sex steroid hormones in downstream and upstream migratory behavior of masu salmon
Autore:
Munakata, A; Amano, M; Ikuta, K; Kitamura, S; Aida, K;
Indirizzi:
Univ Tokyo, Grad Sch Agr & Life Sci, Dept Aquat Biosci, Bunkyo Ku, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 t Biosci, Bunkyo Ku, Tokyo 1138657, Japan Kitasato Univ, Sch Fisheries Sci, Sanriku, Iwate 0220101, Japan Kitasato Univ Sanriku Iwate Japan 0220101 , Sanriku, Iwate 0220101, Japan Natl Res Inst Aquaculture, Nikko Branch, Nikko, Tochigi 3211661, Japan Natl Res Inst Aquaculture Nikko Tochigi Japan 3211661 higi 3211661, Japan
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
fascicolo: 2-3, volume: 129, anno: 2001,
pagine: 661 - 669
SICI:
1096-4959(200106)129:2-3<661:TIOSSH>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
ONCORHYNCHUS-MASOU; 17-ALPHA,20-BETA-DIHYDROXY-4-PREGNEN-3-ONE; 11-KETOANDROSTENEDIONE; SMOLTIFICATION; GONADOTROPIN; THYROXINE;
Keywords:
downstream migration; homing migration; masu salmon; Oncorhynchus masou; sex steroid; testosterone; thyroxine; upstream migration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Munakata, A Univ Tokyo, Grad Sch Agr & Life Sci, Dept Aquat Biosci, BunkyoKu, Tokyo 1138657, Japan Univ Tokyo Tokyo Japan 1138657 nkyo Ku, Tokyo 1138657, Japan
Citazione:
A. Munakata et al., "The involvement of sex steroid hormones in downstream and upstream migratory behavior of masu salmon", COMP BIOC B, 129(2-3), 2001, pp. 661-669

Abstract

From May through July when masu salmon, Oncorhynchus masou, commence downstream migration under natural conditions, yearling precocious male masu salmon (resident form) showed higher GSI and plasma levels of testosterone (T)and 11-ketotestosterone (11-KT) in contrast to immature smelts (migratory form). From March through September coinciding with the upstream migration period, 2-year-old male and female adults also showed higher GSI and plasmalevels of T, estradiol-17 beta (E-2) 11-KT, 17 alpha -hydroxyprogesterone and 17 alpha ,20 beta -dihydroxy-4-pregnene-3-one (DHP). In order to test the effects of steroid hormones on migratory behaviors, silascone tube capsules containing 500 mug of T, E-2, 11-KT, DHP, or a vehicle was implanted into smelts, castrated precocious males, or immature parr, and downstream andupstream behavior were observed in artificial raceways in spring and autumn. Downstream behavior of smelts was inhibited significantly by T, E-2 and 11-KT. Upstream behavior was stimulated by T and 11-KT in castrated precocious males and stimulated by T, E-2 and 11-KT in immature parr. These results indicate that T, E-2 and 11-KT are the factors regulating downstream and upstream migratory behavior. In particular, because of its changing patterns in plasma and significant effects, T, the common precursor hormone of E-2(female) and 11-KT (male), is considered to play central roles in both types of behavior. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/10/20 alle ore 00:10:37