Gonopodium Development in Normal Male and 11-Ketotestosterone-Treated Female Mosquitofish (Gambusia affinis): A Quantitative Study Using Computer Image Analysis

Gonopodium Development in Normal Male and 11-Ketotestosterone-Treated Female Mosquitofish (Gambusia affinis): A Quantitative Study Using Computer Image Analysis

Mature male mosquitofish possess a highly modified anal fin called a gonopodium that develops from an unmodified female-like anal fin under the influence of endogenous androgens at sexual maturity. Although females do not normally develop gonopodia, their anal fins can be induced to develop into gon...

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Bibliographic Details
Published in:General and comparative endocrinology Vol. 123; no. 2; pp. 222 - 234
Main Authors: Angus, Robert A., McNatt, Heather B., Howell, W.Mike, Peoples, Shearlyn D.
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01-08-2001
Subjects:
Aging
Animals
Brackish
Computer Simulation
Cyprinodontiformes - anatomy & histology
Cyprinodontiformes - growth & development
endocrine disruptor
Extremities - anatomy & histology
Extremities - growth & development
Female
Freshwater
Gambusia affinis
gonopodium
Male
masculinization
morphology
poeciliidae
Sex Characteristics
Sexual Maturation - drug effects
Testosterone - analogs & derivatives
Testosterone - pharmacology
endocrine disruptor
gonopodium
morphology
poeciliidae
masculinization
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Summary:Mature male mosquitofish possess a highly modified anal fin called a gonopodium that develops from an unmodified female-like anal fin under the influence of endogenous androgens at sexual maturity. Although females do not normally develop gonopodia, their anal fins can be induced to develop into gonopodium-like structures by the administration of androgens. We used computer image analysis techniques to quantify the morphological changes in the anal fins of normal male and female mosquitofish during growth and development and the changes that occur in females exposed to an androgen, 11-ketotestosterone. The mosquitofish anal fin is a useful bioassay system for quantifying the effects of known or suspected environmental androgens.
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ISSN:0016-6480
1095-6840
DOI:10.1006/gcen.2001.7669