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[Allen Johnson <allen_h_johnson at yahoo_com>]

I see that there is a continuing thread on sex tatio
in killifish.  Here are my two cents worth.  First in
humans sex is determined by specific sex chromosomes
an x for female and a y for male.  Presumably that is
true for most mammals, but I cannot verify that
statement.  Having raised budgies for a number of
years the male chromosome is X chromosome and the
female is the Y chromosome.  For reptiles there is
scarely any difference between sex chromosomes and sex
is laregly determined by environmental conditions (pH,
temperature, various hormonal exposure during egg
development.  I suspect that fish have even less
sexual determination from sexual chromosomes.  Sex in
fish is environmentally determined.  Now the question
is at what time is the sex determined: at the time of
fertilization or during embryonic development or post
hatching , but before maturation?  It would be
interesting for someone to set up an experiment that
could test and come to an answer.

By the way does anyone have a male Simp. antenori?  I
sure could use one.    

=====
Allen H. Johnson
132 Whispering Oaks Dr.
West Chester, Pa.  19382

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