Sex Determination in Fish is the first to report
that research in allogenics/xenogenics has conclusively shown that fishes have
retained bisexual potency even after sexual maturity and spermiation. The XY
genotype found in the unexpected female phenotypes sired by supermales (Y1Y2)
and androgenic males (Y2Y2) points out the need to employ
sex specific molecular markers to identify the true genotype of a juvenile,
which matures either as a male or female, depending upon the sex of its pair
(female or male) and thereby critically assessing the environmental role in sex
determination. This book is meant to assist molecular biologists in the search
of sex determining gene(s), fishery biologists
endeavouring to develop techniques for profitable monosex aquaculture and
ecologists interested in conservation of fishes and their genomes.
The title of the
book is a ‘hot area’ of research. Not surprisingly, there are many reviews and
books on this topic. However, these are more concerned with sex differentiation
than sex determination; they have not considered unisexualism in the context of
sex determination in fishes. In an attempt to find clues to resolve the riddle
of sex determination in fishes, this comprehensive book explores it from
cytogenetics through hybrids, gynogenics, androgenics, ploidies,
allogenics/xenogenics to sexonomics of gonochores, hermaphrodites and
unisexuals. About 77 and 50% of references cited here are dated after 1991 and
2001, respectively; they were collected from widely scattered 375 sources of
journals, book proceedings, theses and so on. As the book is a continuum of the
earlier book ‘Sexuality in Fishes’, there are a few unavoidable but
obligatorily required duplications to keep each chapter complete and
independent, besides pointing out areas of research requiring critical inputs.
None of the earlier reviews/books have ever considered allogenics/xenogenics;
this book is the fi rst to report that researches in this frontier area have
conclusively shown that fishes have retained bisexual potency even after sexual
maturity and spermiation. The XY genotype found in the unexpected female
phenotypes sired by supermales (Y1Y2) and androgenic males (Y2Y2) points out
the need to employ sex specific molecular markers to identify the true genotype
of a juvenile, which matures either as a male or female, depending upon the sex
of its pair (female or male) and thereby critically assess the environmental role
in sex determination.
