Genetic analyses of cod in northern norway. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
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http://hdl.handle.net/11250/115138Utgivelsesdato
1984Metadata
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Sammendrag
Several polymorphic proteins have been used in studies of
cod stock structure in northern Norway. Samples of Arctic
cod spawning in Lofoten in the spring of 1981 were analysed
for enzyme polymorphism by starch gel electrophoresis. The
genotype distributions and allele frequencies estimated for
spawning cod were consistent with corresponding results for
eggs and yolksac larvae sampled in Lofoten and the Vesterålen
area in May. Investigations of postlarvae in July, however,
revealed samples which differed significantly from the
samples of Arctic cod analysed earlier the same year. Most
surprisingly, a postlarval sample from Eidsfjord, close to
the main hatching area of Arctic cod in Vesterålen, differed
in biological as well as genetic characters. Similar observations
were made in 1982, when postlarvae were found in high
numbers in the Vesterålen - Andfjord area. Samples of
spawning cod were collected from several fjords in 1982.
Especially, the sample drawn from Porsangerfjord differed
from Arctic cod giving evidence for a genetically distinct
stock of coastal cod in this area. This conclusion was also
confirmed by analysis of postlarvae and juveniles found in
the same area. Haemoglobin analysis in spring 1983 supported
the existence of several genetically differentiated groups of
coastal cod stocks in the area investigated.
Utgiver
HavforskningsinstituttetSerie
Flødevigen rapportserie1, 1984