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Structure of Normal Testis and Testicular Tumors in Cyprinids from Lake Ontario¹

Departments of Zoology [J. F. L.] and Microbiology [R. A. S.], College of Biological Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1

Two types of testicular tumor were evident in cyprinid fishes collected from Lake Ontario. Both types of tumors appeared to be of Sertoll cell origin. One contained predominantly Sertoli cells with little or no lipid content and germinal cells in only small numbers. The second contained large numbers of spermatogonia together with Sertoll cells that contained large amounts of lipid and smooth endoplasmic reticulum. Small, apparently inactive Leydig cells were present in both types of tumors and also in testes of fish not bearing gonadal tumors.

¹ Supported by grants from the National Cancer Institute of Canada, Environment Canada, and the National Research Council of Canada.

² To whom requests for reprints should be addressed.

³ Research Scholar, National Cancer Institute of Canada. Present address: Department of Biology and Pathology, McMaster University, Hamilton, Ontario, Canada.

Received 8/18/77. Accepted 6/20/78.