Environmental Sex Differentiation in Fish

About this book

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. Environmental Sex Differentiation in Fish 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, Environmental Sex Differentiation in Fish 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.

Contents

Introduction
- Genetic basis
- Genes meet environment
- Social structure
- Mating system
- Parental care
- Hermaphroditism
- Model fishes
- References

Overexploitation by fisheries
- Fisheries scenario
- Sexual maturity
- Fecundity
- Spawning stress
- Collapse of fishery
- Sex change
- Sperm economy
- Social induction
- Reproductive life span
- References

Aquaculture and crowding
- Human interventions
- Crowding and consequences
- References

Endocrine disruption
- Labile and non-labile stages
- History and prevalence
- Routes of entry
- Mechanism of disruption
- Selected labile stages
- Morphology and anatomy
- Ovotestis and testis-ova
- Vitellogenesis
- Gametogenesis
- Courting and mating
- Spawning and spermiation
- Fertilization and fecundity
- Hatching and survival
- New from old
- References

Hypoxia and anoxia
- Hypoxic habitats and fisheries
- Hypoxia and differentiation
- Hypoxia and impairments
- Anoxia
- References

pH and precipitation
- pH and sex ratio
- Precipitation
- References

Temperature and sex ratio
- Identification of GSD and TSD
- Patterns 2 and 3
- Parental genetic role
- Insensitive fishes
- Germ cells and aromatase
- Model fishes
- Prevalence and patterns
- References

Climate change and differentiation
- Model systems
- Impairment and distribution
- Global food security
- References

Conservation
- Cryopreservation
- Vitrification
- Androgenesis
- Cloning
- Reprogramming
- Tissue culture
- Xenogenesis
- References

Labile period and new hypothesis

Author index
Species index
Subject index

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