timing of sexual determination in fish

Chuck Miller rellim at MAILHOST.TCS.TULANE.EDU
Fri Dec 8 10:07:58 EST 1995


 I am posting this message for colleagues of mine who are beginning to
study effects of xenoestrogens on sex determination in fish. Replies can be
directed to this news group or to me. Their problem is-----
 
 "Japanese Medaka is reported to be a stable with respect to sexual
dimorphism--thus once it becomes male or female it stays that way. We have
been searching the literature for information regarding the timing  of
organ commitment to form ovary or testes in fish, but so far we haven't
found much. The question is: At what point in development is the primordial
gonad (microscopically/histologically) distinguishable as selecting an
ovarian or testicular pathway? Specifically , we are interested in the
Japanese Medaka--but info. on any fish species will be useful."

Thanks for your help!

 Chuck
 
Dr. Charles A. Miller,  rellim at mailhost.tcs.tulane.edu 
Bionet.Toxicology News Group Discussion Leader
Dept. Environmental Health Sciences 
Rm. 374, Center for Bioenvironmental Research
School of Public Health and Tropical Medicine
Tulane University Medical Center  
1430 Tulane Ave. Box SL29                 
New Orleans, LA 70112               
Ph. 504-585-6942, Fx. 504-585-6939              

                                                                        
                   






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