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Titolo:
Aspects of basic reproductive biology and endocrinology in the fathead minnow (Pimephales promelas)
Autore:
Jensen, KM; Korte, JJ; Kahl, MD; Pasha, MS; Ankley, GT;
Indirizzi:
US EPA, Midcontinent Ecol Div, Duluth, MN 55804 USA US EPA Duluth MN USA 55804 A, Midcontinent Ecol Div, Duluth, MN 55804 USA
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
fascicolo: 1, volume: 128, anno: 2001,
pagine: 127 - 141
SICI:
1532-0456(200101)128:1<127:AOBRBA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
OOCYTE DEVELOPMENT; STEROID-HORMONES; FUNDULUS-HETEROCLITUS; OVARIAN FOLLICLES; GONADAL-STEROIDS; SEASONAL-CHANGES; PLASMA-LEVELS; GOLDFISH; EXPOSURE; 17-BETA-ESTRADIOL;
Keywords:
endocrine disruption; fathead minnow; gonad; reproduction; secondary sex characteristics; sex steroids; spawning cycle; vitellogenin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Jensen, KM US EPA, Midcontinent Ecol Div, 6201 Congdon Blvd, Duluth, MN 55804 USA US EPA 6201 Congdon Blvd Duluth MN USA 55804 luth, MN 55804 USA
Citazione:
K.M. Jensen et al., "Aspects of basic reproductive biology and endocrinology in the fathead minnow (Pimephales promelas)", COMP BIOC C, 128(1), 2001, pp. 127-141

Abstract

The fathead minnow (Pimephales promelas) has been proposed as a model species for assessing the adverse effects of endocrine-disrupting chemicals (EDCs) on reproduction and development. The purpose of these studies was to develop baseline reproductive biology and endocrinology data for this speciesto support interpretation of tests with potential EDCs. Pairs of reproductively-active fathead minnows (n = 70) were evaluated with respect to reproductive cyclicity in terms of spawning interval and fecundity. The mode and mean (+/- SE) spawning intervals for the fish in this study were 3.0 and 3.7 +/- 0.1 days, respectively. The mean number of eggs produced per spawn was 85 +/- 2.8. Animals were sacrificed at periodic intervals during the established spawning cycle and measurements made of gonadal condition (gonadosomatic index [GSI], histopathology) and plasma concentrations of vitellogenin and sex steroids (beta -estradiol, testosterone, 11-ketotestosterone). The GSI in females varied significantly as a function of spawning interval, with the largest values occurring day 2 post-spawn, just prior to the interval of maximum spawning activity. Plasma beta -estradiol concentrations in females also varied significantly relative to peak values in the GSI and spawning activity. Vitellogenin concentrations in the female, and male GSI andsteroid concentrations did not vary significantly relative to position in the spawning cycle. Concentrations of beta -estradiol in females and 11-ketotestosterone in males were positively correlated with testosterone concentrations. Published by Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 11:25:34