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Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > Vertebrates > Fishes (ichthyology)
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Environmental Sex Differentiation in Fish (Paperback)
Loot Price: R1,961
Discovery Miles 19 610
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Environmental Sex Differentiation in Fish (Paperback)
Expected to ship within 12 - 17 working days
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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.
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