Importance of genetic variation in the propagation of cod. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
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http://hdl.handle.net/11250/115066Utgivelsesdato
1984Metadata
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Sammendrag
During the last decade the existence of genetic diversity
within species and populations has been generally accepted.
The complex structure of populations as well as the variations
within populations is believed to be of fundamental
importance for adapting to a changing environment and for
further evolution.
Several genetic studies have suggested a complex population
structure for the cod in Norwegian waters. Cod stocks
in enhancement programmes may suffer the unwanted loss of
genetic variation which has been observed in stocking and
enhancement programmes for anadromous species. In preliminary
experiments with cod in the laboratory, differential selection
against some genotypes was observed and is in fact
likely to take place when producing cod fry. When producing
large quantities of fry from a few parent fish, genetic drift
will also greatly effect the gene pool.
At present, however, methods for genotyping parental fish
and genetic analysis of cod eggs and larvae offer the opportunity
of genetic control at different stages of development.
The importance of genetic surveillance of local populations,
application of genetic principles and methods to prevent loss
of genetic variation, and the possibility of using "genetically
tagged" cod fry are discussed in relation to artificial
propagation programmes for cod.
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HavforskningsinstituttetSerie
Flødevigen rapportserie1, 1984