Genetic Sex Differentiation in Fish

About this book

A comprehensive elucidation of sex differentiation gonochoric and hermaphroditic fishes, Genetic Sex Differentiation in Fish examines sex chromosomes and sex determining genes, through sex differentiation genes and steroid receptor genes and to stem cells and germ cells. It emphasizes the need to search for more than one sex determining gene residing on different chromosomes, traces the origin of hermaphrodites from secondary gonochores, and explains the conservation of homologous sex differentiation and steroid receptor genes among gonochores and hermaphrodites.

The author highlihgts that the changes in the phenotypic morphotypes among gonochores is intrasexual but intersexual among hermaphrodites and identifies the optimal broodstock size, the appropriate candidate species for bait and food fishes and recognizes that the fishes do undergo menopause and reproductive senescence, which has an implication on the production of stem cells. He shows that the analysis of steriles and mutants has demonstrated the value of fishes as a system for genetic dissection of human development and diseases.

Contents

Introduction
Sex Determination
Hermaphroditism
Patterns of Sex Differentiation
Impact of New Techniques

Differentiation in Gonochores
Sex Chromosomes
Sex Determining Genes
Sex Differentiation Genes
Sex Steroid Receptor Genes
Gonadal Differentiation
Model Fshes
Genetic Cascades
Gonadal Ducts
Puberty and Maturation
Acrosomeless Sperm and Micropylar Eggs
Secondary Sex Characters
Morphotypes and Differentiation
Reproductive Senescence
Stem Cells and Germ Cells

Differentiation in Hermaphrodites
Patterns of Hermaphroditism
Simultaneous Hermaphrodites
Sex Changing Hermaphrodites
Structural and Temporal Costs
Sex Chromosomes and Genes
Sex Differentiation Genes
Gonadal Differentiation
Morphotypes and Differentiation

Strelity and Mutants
Gonadectomy
Abnormals and Steriles
Mutants

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