Conservation of the genetic resources of fish: problems and recommendations. Report of the Expert Consultation on the genetic resources of fish. Rome, 9-13 June 1980.
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The report reviews arguments for the preservation of the genetic resources of fish and various strategies for accomplishing this in both marine and continental waters. It reviews the significance of genetic diversity, especially within populations and subpopulations, to the viability of aquatic ecosystems and to the fitness of fish populations, and discuss the various means by which genetic impoverishment comes about. The report emphasizes the importance of maintaining breeding populations of an effective size of at least 50 for short-term fitness and of at least 500 for long-term survival; and of avoiding “genetic bottlenecks” created by reduction of breeding populations to small size for one or more generations. The report also considers available technologies for the monitoring, preservation and enhancement of genetic resources in closely managed fish stocks. It concludes by presenting recommendations addressed to five different groups: these are international organizations, gover nments, aquaculturists and fishery managers, conservationists and research scientists.