Genetic Conservation of Salmonid Fishes by René Guyomard (auth.), Joseph G. Cloud, Gary H. Thorgaard

By René Guyomard (auth.), Joseph G. Cloud, Gary H. Thorgaard (eds.)

As the human inhabitants raises and international locations develop into extra industrialized, the habitat and water caliber required for the survival of fish maintains to say no. as well as those environmental elements, fish populations are at once or most likely plagued by harvesting, enhancement courses and introgression with hatchery-propagated or transgenic fish. To our wisdom no different medical assembly has been assembled to contemplate the breadth of the matter, to study the expertise that's almost immediately on hand for the protection of the germ plasm of salmonid shares and to spot the clinical advances which are required to beat the issues. simply because many salmonids have spawning grounds in the confines of a selected quarter or county yet will spend a wide section of their existence cycle in the territorial waters of alternative nations or within the open ocean, the renovation of certain genes or gene swimming pools in those animals calls for overseas cooperation. This clinical assembly has supplied a discussion board within which to debate the issues, evaluation the current tools or know-how for addressing the issues and recommend new instructions or ideas that must be carried out. in this assembly we constrained our dialogue to salmonid fishes. even if, the final conclusions concerning the components that have an effect on the inhabitants dynamics of fish shares and the technical elements about the protection of germ plasm should be appropriate to different fish species.

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2. Genetic Diversity in Pacific Salmon The life history and biology of Pacific salmon have recently been reviewed in Groot and Margolis (1991). " a. E I I ~ I I .. Spatial variability Figure 2. Schematic representation of the hierarchical organization of genetic diversity in Pacific salmon. The inverted triangle emphasizes that locally adapted, and largely reproductively isolated sub-populations or demes are the basic unit of diversity in these species. Varying definitions of "stock" would place this term in the range identified by the dashed lines.

Understanding atmospheric change: a survey of the background science and implications of climate change and ozone depletion. Environment Canada, State of the Environment Report 91-2, Ottawa. Hilborn, R 1992. Hatcheries and the future of salmon in the northwest. Fisheries (Bethesda) 17:5-8. , N. Ryman and F. Utter. 1991. Genetic effects of cultured fish on natural fish populations. Canadian Journal 0/Fisheries and Aquatic Sciences 48(5):945-957. O. and AJ. Jensen. 1991. The Gyrodactylus story in Norway.

V. Tingey. 1990. DNA polymorphisms amplified by arbitrary primers are useful as genetic markers. Nucleic Acids Research 18:22-29. 22 Spatial Organization of Pacific Salmon: What To Conserve? E. RIDDELL 1. Introduction The rich biological diversity in salmonids has been recognized for centuries and has been a central premise in managing salmon fisheries in this century (the "Stock Concept"). But recently, as in many other biological resources (F AO, 1981; Oldfield, 1989), increased concern has been expressed about the loss of biological diversity and the impact of harvest management on Pacific salmon.

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