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Genetic diversity and the management of natural populations of brown trout

  • R. Guyomard
Chapter

Abstract

Data accumulated over the past twenty years have clearly shown the presence of significant genetic variability within most species. Part of this variability confers different adaptive values on individuals making up the species. The objective of genetic improvement is to select and propagate the genotypes showing the best adaptive value in a given production system. Selective breeding methods have been established for most domesticated species or populations with, in parallel, the setting up of gene banks. In contrast, this step has seldom been adopted for species which are directly exploited in the environment, such as fish. This tardiness results, on the one hand, from the very recent consideration of genetic concepts of populations in fishery management and, on the other hand, from the difficulty in defining the selection criteria and in carrying out controls for performance in the natural environment. Genetic improvement, as conceived in domesticated species, appears utopic when considering natural populations. It is sometimes possible to experiment with management plans for natural populations, with respect to the genetic diversity of species and the principles of population genetics, and to formulate schemes which, without being ideal or definitive, can constitute progress in relation to current practice.

Keywords

Natural Population Brown Trout Chum Salmon Cutthroat Trout Mediterranean Population 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Praxis Publishing Ltd, Chichester, UK 1999

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  • R. Guyomard

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