Reconnaissance of 17ß-Estradiol, 11-Ketotestosterone, Vitellogenin, and Gonad Histopathology in Common Carp of United States Streams: Potential for Contaminant-Induced Endocrine Disruption

By Steven L. Goodbred, Robert J. Gilliom, Timothy S. Gross, Nancy P. Denslow, Wade L. Bryant, and Trenton R. Schoeb

U.S. Geological Survey Open-File Report 96-627

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Figures 2E-G

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Figure 2E. Male adult carp testis from Platte River at Louisville, Nebraska, showing thick germinal epithelium with diffuse pronounced proliferation and maturation of spermatozoa; classified as stage 1, early spermatogenic. The carp was 8 years old, 475 mm in length, and weighed 1,454 g.

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Figure 2F. Male adult carp testis from Hudson River, south of Lake Luzerne, New York, showing moderately thick germinal epithelium with diffuse moderate proliferation and maturation of spermatozoa; classified as stage 2, mid-spermatogenic. The carp was 2 years old, 518 mm in length, and weighed 2,334 g.

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Figure 2G. Male adult carp testis from Anacostia River at Washington Shipping Channel, District of Columbia, where germinal epithelium is mostly thin with only scattered spermatogenic activity characteristic of full-grown testes; classified as state 3, late spermatogenic. The carp was 5 years old, 530 mm in length, and weighed 2,286 g.

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