Sex Determination In Fish
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Sex Determination In Fish
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Author : T. J. Pandian
language : en
Publisher: CRC Press
Release Date : 2011-09-02
Sex Determination In Fish written by T. J. Pandian and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-09-02 with Science categories.
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 ma
Genetic Sex Differentiation In Fish
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Author : T. J. Pandian
language : en
Publisher: CRC Press
Release Date : 2012-06-05
Genetic Sex Differentiation In Fish written by T. J. Pandian and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-06-05 with Nature categories.
A comprehensive study of sex differentiation gonochoric and hermaphroditic fishes, this book examines sex chromosomes and sex determining genes, emphasizing the need to search for more than one sex-determining gene residing on different chromosomes. It 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 identifies the optimal broodstock size and the appropriate candidate species for bait. 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.
Sex Determination And Differentiation In Fish
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Author : Avner Cnaani
language : en
Publisher:
Release Date : 2009
Sex Determination And Differentiation In Fish written by Avner Cnaani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Fishes categories.
Sexual development in fish is characterized by extraordinary variation, including genetic and environmental sex determination, male and female heterogamety, single gene and polygenic systems, protandry, protogyny and simultaneous hermaphroditism, social influence on sexual determination, and many combinations and variations between and within these systems. In recent years, major breakthroughs have been made in studying sexual development in fish, attracting the attention of researchers in other fields such as developmental biology, genetics, evolution, ecology, conservation and aquaculture. This special issue brings together some of the recent hot topics in this field and provides an overview of the broad range of scientific aspects that benefit from knowledge on sexual development in fish. It presents ten reviews by international experts who explore the genetic basis of sex determination, gonadal differentiation, environmental effects on sexual development, evolutionary views and application in fisheries and aquaculture. An excellent source of up-to-date information, this publication is highly recommended to researchers and students interested in the evolution of sex determination, fish genetics and breeding.
Sex Control In Aquaculture
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Author : Hanping Wang
language : en
Publisher: John Wiley & Sons
Release Date : 2018-11-08
Sex Control In Aquaculture written by Hanping Wang and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-08 with Technology & Engineering categories.
Awarded Bookauthority's "Best Aquaculture Books of all Time" A comprehensive resource that covers all the aspects of sex control in aquaculture written by internationally-acclaimed scientists Comprehensive in scope, Sex Control in Aquaculture first explains the concepts and rationale for sex control in aquaculture, which serves different purposes. The most important are: to produce monosex stocks to rear only the fastest-growing sex in some species, to prevent precocious or uncontrolled reproduction in other species and to aid in broodstock management. The application of sex ratio manipulation for population control and invasive species management is also included. Next, this book provides detailed and updated information on the underlying genetic, epigenetic, endocrine and environmental mechanisms responsible for the establishment of the sexes, and explains chromosome set manipulation techniques, hybridization and the latest gene knockout approaches. Furthermore, the book offers detailed protocols and key summarizing information on how sex control is practiced worldwide in 35 major aquaculture species or groups, including fish and crustaceans, and puts the focus on its application in the aquaculture industry. With contributions from an international panel of leading scientists, Sex Control in Aquaculture will appeal to a large audience: aquaculture/fisheries professionals and students, scientists or biologists working with basic aspects of fish/shrimp biology, growth and reproductive endocrinology, genetics, molecular biology, evolutionary biology, and R&D managers and administrators. This text explores sex control technologies and monosex production of commercially-farmed fish and crustacean species that are highly in demand for aquaculture, to improve feed utilization efficiency, reduce energy consumption for reproduction and eliminate a series of problems caused by mixed sex rearing. Thus, this book: Contains contributions from an international panel of leading scientists and professionals in the field Provides comprehensive coverage of both established and new technologies to control sex ratios that are becoming more necessary to increase productivity in aquaculture Includes detailed coverage of the most effective sex control techniques used in the world's most important commercially-farmed species Sex Control in Aquaculture is the comprehensive resource for understanding the biological rationale, scientific principles and real-world practices in this exciting and expanding field.
Endocrine Sex Differentiation In Fish
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Author : T. J. Pandian
language : en
Publisher: CRC Press
Release Date : 2013-05-07
Endocrine Sex Differentiation In Fish written by T. J. Pandian and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-07 with Nature categories.
Of all vertebrates, fish exhibit unparalleled diversity of sexual plasticity and flexibility, ranging from gonochorism to unisexualism, and exceptional patterns of functional hermaphroditism. Fish farming and monosex aquaculture have led to reproductive dysfunction with males producing less milt, and females failing to ovulate and spawn. This book brings together relevant information on the role of the endocrine system on sexual differentiation in fish, and bridges the gap between molecular endocrinologists and fishery scientists.
Sexual Plasticity And Gametogenesis In Fishes
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Author : Balasubramanian Senthilkumaran
language : en
Publisher: Nova Science Publishers
Release Date : 2013
Sexual Plasticity And Gametogenesis In Fishes written by Balasubramanian Senthilkumaran and has been published by Nova Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Adaptation (Physiology) categories.
Sex determination, differentiation and gamete maturation are well organised 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.
Environmental Sex Differentiation In Fish
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Author : T. J. Pandian
language : en
Publisher: CRC Press
Release Date : 2014-12-22
Environmental Sex Differentiation In Fish written by T. J. Pandian and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-12-22 with Nature categories.
Fish constitute an important natural renewable resource and any reduction in their ability to propagate as a result of human interference may have significant socioeconomic consequences. The negative effect of human activity on sex differentiation and reproductive output in fish is so diverse that it has been difficult to encompass it in a single book. This book serves as the first attempt to do so. Unlike in mammals, the expression of a host of sex differentiation genes in fish is mostly controlled by environmental factors. Not surprisingly, environmental sex differentiation is ubiquitous in fish. Overexploitation by capture fisheries does not disrupt sex differentiation but crowding in aqua-farms does, by reducing accessibility to food supply. Some of the man-made chemicals routinely used worldwide mimic endogenous hormones. For example endosulfan, which is widely used in developing countries, disrupts endogenous hormones and feminizes fish. For the first time, this book views endocrine disruption from the point of labile early life and non-labile adult stages. It shows that sex can irreversibly be reversed, when exposed to endocrine disrupting chemicals (EDCs) during early labile stages but reversibly impairs reproductive output on exposure to EDCs during non-labile adult stage. A consequence of climate change, elevated temperature, and declining oxygen and pH levels is that it masculinises genetic female fish. Fish display a remarkable ability to postpone the labile period. Besides postponement, some primary and tertiary gonochores have two distinct labile periods amenable to temperature and hormonal manipulations. Hermaphrodites have retained the period until the end of the adult stage and are capable of sex change/reversal more than once in both male and female directions.
Intersexuality In The Animal Kingdom
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Author : R. Reinboth
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Intersexuality In The Animal Kingdom written by R. Reinboth and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
When Richard Goldschmidt' coined the term "intersexuality" in 1915, he intended it to apply to normally dioecious species which exhibit some kind of mixture between male and female characters. However, as knowledge of the bewildering variability present in the sexual orga nization of members of the animal kingdom has increased, the original meaning of the word has changed. Today many authors define inter sexuality as "the presence of both male and female characteristics, or of intermediate sexual characteristics, in a single individual".2 This more extensive and widely accepted concept justifies the title of our book •. Among all the anatomical and physiological features of living organisms the reproductive system has a unique importance for the perpetuation of the species. Conversely, reproductive processes are of little or no account for the viability of the individual. Therefore, within the framework of general biology reproduction has all too often been looked at solely from the point of view of genetics. Lively discussions about genotypic versus phenotypic sex determination long dominated the sci entific literature on sexuality in animals; this one-sided emphasis has tended to obscure many important facets of an organism's ability to reproduce. Recent developments in current biological research have brought the classic problem of sex differentiation into focus again, and the rapid progress being made in comparative endocrinology has added a new di mension to the study of reproductive biology.
Sex Differentiation In Fishes
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Author : Bruno Augusto Amato Borges
language : en
Publisher: Delve Publishing
Release Date : 2018-12
Sex Differentiation In Fishes written by Bruno Augusto Amato Borges and has been published by Delve Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12 with Technology & Engineering categories.
Examines various aspects of sex differentiation in fish. The book covers sex determination and differentiation mechanisms, and provides details of gene expression and environmental effects on sex determination.
Temperature Dependent Sex Determination In Vertebrates
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Author : Nicole Valenzuela
language : en
Publisher: Smithsonian Institution Scholarly Press
Release Date : 2004
Temperature Dependent Sex Determination In Vertebrates written by Nicole Valenzuela and has been published by Smithsonian Institution Scholarly Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Science categories.
Edited by the world's foremost authorities on the subject, with essays by leading scholars in the field, this work shows how the sex of reptiles and many fish is determined not by the chromosomes they inherit but by the temperature at which incubation takes place.