Sex Determination in Fish: 1st Edition (Paperback) book cover

Sex Determination in Fish

1st Edition

By T. J. Pandian

CRC Press

294 pages

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pub: 2011-09-02
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Description

This book 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.

Table of Contents

Introduction

Gonadal origin, eggs and sperm; Chromosomes and heterogamety; Prevalence of gonochorism; Escape from Muller’s ratchet; Multiple parentage and genetic diversity; Prelude

Cytogenetics and Sex Chromosomes

Chromosomes and genomes; Cytogenetics; Heterogamety

Hybridization and Sex Ratio

Extent of hybridizations; Hybrid identification; Viability and fertility; Introgressive hybridization; Sex ratio

Gynogenesis and Consequences

Gynogenics types; Purity of gynogenics; Survival and gamety; Fertility and F1 sex ratio; Sex ratio and departures

Androgenesis and Autosomes

Production methods; Survival; Fertility; Overriding autosomes

Triploidy and sterility

Types of triploids; Survival and sex ratio; Male’s fertilizability; Female sterility

Tetraploidy and polyploidy

Survey and history; Scope for polyploidization; Tetraploid types; True induced tetraploids; Polyploidy; Intraploid hybridizations; Unreduced "gamete bank"

Allogenesis and xenogenesis

Primordial Germ Cells (PGCs); PGC transplantation system; PGCs in hybrid embryos; PGCs in heterospecific embryos; Spermatogonial Stem Cells (SSCs); Renewal of SSCs; SSC transplantation system; Relevance of PGCs and SSCs; Surgical gonadectomy

Sex changers and hermaphroditism

Extant of hermaphroditism; Sex change in gonochores; Sex allocation; Sex changing age; Genetic or environment?

Unisexualism and reproductive modes

Mutational meltdown; Exploration of reproductive modes; Squalius alburnoides; Males in unisexuals

Genetic sex determination

Molecular markers; Sex chromosomes; Sexonomics; Sex changers; Polygenic sex determination; Concluding remarks

Subject Categories

BISAC Subject Codes/Headings:
SCI039000
SCIENCE / Life Sciences / Biology / Marine Biology
SCI072000
SCIENCE / Life Sciences / Biology / Developmental Biology