Sexual Plasticity and Gametogenesis in Fishes PDF. Sex determination, differentiation and gamete maturation are well organized molecular events in vertebrates. In vertebrates, sex determination and differentiation are two important events in the development of gonads (testis or ovary). Sex determination is the genetic (sex chromosomes) or environmental process by which the sex (male or female) of an individual is established. During embryonic development, primordial germ cells migrate from the site of origin to the gonadal primordia where they differentiate along with somatic cells and finally form the indifferent/bipotential gonads. Depending on the action of various factors the bipotential gonads give rise to either testis or ovaries. In most vertebrates, excluding fishes and some amphibians, the event of sex determination is controlled genetically and later the progression of gonadal development is controlled by hormones and other factors. Interestingly, these processes in fishes are controlled not only genetically but also through hormones or environmental factors. These characteristics make fish the champions of sex reversal and serve as excellent animal models to precisely understand sexual development. The next interesting aspect is meiotic maturation which is essentially mediated by gonadotropins and progesterone metabolites to trigger final gamete maturation in fishes which is different from mammals. The novel aspects pertaining to gamete maturation has been studied in great detail in fish which depicts precise regulatory events of gamete maturation.
Chapter 1: Involvement of Neuropeptides in Gonadotropin Secretion in Teleost Fish
Chapter 2: Neuroendocrine Control of Lunar-Synchronized Spawning Rhythm in Grass Puffer
Chapter 3: Cytokines as Intraovarian Mediators of Luteinizing Hormone-Induced Ovulation in Fish
Chapter 4: Teleosts as Model for Environmental Risk Assessment
Chapter 5: Atherinopsid Fishes as Models for the Study of Temperature-Dependent Sex Determination: Physiology of Gonadal Sex Differentiation in Pejerrey Odontesthes Bonariensis
Chapter 6: Developmental Aspects of Reproductive Hormones in Fish
Chapter 7: Dimorphisms in the Brain and Involvement of Various Neurosubstances in Fish Reproduction: An Overview
Chapter 8: Ovarian Catecholestrogens: Role in Final Oocyte Maturation
Chapter 9: Understanding the Mechanism of Oocyte Maturation and Ovulation to Induce Spawning for Seed-Production in the Japanese Eel: Tough and Challenging Task
Chapter 10: Transgenic Medaka Lines with a Visible Marker for Phenotypic Sex: Genetic Analyses of an XY Sex-Reversal
Chapter 11: Hypothalamic Regulation of Pituitary Gonadotropins
Chapter 12: Sexual Plasticity of Behavior in Goldfish
Chapter 13: Molecular Mechanisms of Gonadal Sex Differentiation and Sex-Reversal in Fish: Tilapia and Medaka
Chapter 14: Physiological and Endocrinological Mechanisms of Sex Change in the Grouper
Chapter 15: Some Non-Classical Intragonadal Regulators of Fish Reproduction
Chapter 16: Involvement of Brain-Pituitary-Gonadal Axis on the Regulation of the Reproductive Cycle in Female Chub Mackerel
Chapter 17: Teleosts are Classical Models for the Study of Oogenesis and Shift in Steroidogenesis
Chapter 18: Function of Germ Cells in Sex Differentiation
Chapter 19: Fish Gonadotropin Receptors
Chapter 20: Regulation of Teleost Reproduction by Brain-Pituitary Axis
Chapter 21: Perspectives on the Gonadotropin-Releasing Hormone Gonadotropins-Monoamines: Relevance to Gonadal Differentiation and Maturation in Teleosts
Chapter 22: Zebrafish as a Vertebrate Model System for Developmental Biology and Biomedical Research
Chapter 23: Sperm Maturation in Teleosts: Role of Androgens and Progestins in Our Present Understanding to Emerging New Concepts
Chapter 24: Expression Profiling of Various Marker Genes Involved in Gonadal Differentiation of Teleosts: Molecular Understanding of Sexual Plasticity
Chapter 25: Membrane Progestin Receptor, a Key Mediator of Final Oocyte Maturation in Fish
