By J. E. Thorpe, Graham A.E. Gall, Jim E. Lannan, Colin E. Nash
Fish and shellfish contain each year approximately 70-million a whole bunch the world's fit for human consumption animal protein. although, due to this call for, formerly big shares have usually been exhausted to the purpose of close to extinction. the 1st publication of its sort within the zone of freshwater/marine biodiversity, this vast paintings studies the current prestige of genetic source administration, its wishes and constraints, numerous intervening human components resembling toxins and overfishing, and difficulties posed through assorted species and life-styles. This dialogue of the conservation of fish and shellfish assets is illustrated by way of 4 varied teams: Atlantic salmon, cupped oysters, universal and chinese language carp, and Nile tilapia. those effects, produced by way of the collaboration of 9 top inhabitants and construction geneticists, aquaculturists, and behavioral and developmental ecologists should still develop into a basic source helpful to biologists, scientists and advisors exploring present matters within the fishery sciences. Key beneficial properties * 4 web page colour plate part * Database of key agencies for touch reasons * Foreword by way of Dr. Mike Strauss, Am. Assoc. for the development of technology; and Dr. Peter Day, Rutgers college * 4 in-depth case experiences via overseas specialists * Editors are significant names in marine/freshwater fisheries technological know-how * initially backed and reviewed via U.S. nationwide Academy of Sciences
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Extra resources for Conservation of Fish and Shellfish Resources: Managing Diversity
Genetic drift and inbreeding may continue to accumulate in subsequent generations unless hatchery managers take specific preventive measures. Unless they develop a pedigree for the hatchery brood stock, disproportionate representation of some lineages and elimination of others is highly probable. Intentional and inadvertent brood-stock selection may result in further divergence. For example, the timing of ovulation in salmonids has a genetic component. A frequent selective practice in salmonid hatcheries employed in culture-based fisheries is to use gametes from early-spawning fish to ensure filling the hatchery quota.
Unfortunately in most cases, little correspondence is apparent between patterns of allelic variation and continuously distributed quantitative traits, including life history traits (Lewontin, 1984; but see also Jordan & Youngson, 1991; Powers et al, 1991). Therefore differences in breeding structures of populations as revealed by electrophoresis are not necessarily adaptive, that is, the differences may not be related to the population's capacity to survive and reproduce (Gould & Lewontin, 1979).
A government-sponsored programme in Hungary propagates 18 landraces of common carp, Cyprinus carpio, continuously (Bakos, 1976). The programme maintains nine domestic landraces and nine exotic landraces imported from Europe and Asia. The breeding centre provides fingerlings for aquaculture, for stocking impoundments for recreational fishing, and for restoring and enhancing depleted natural populations. The progranmie evaluates the performance of all landraces and their hybrid combinations continuously.