Pigghåundersøkelsene
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1961Metadata
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- Fisken og havet (1958- ) [700]
Abstract
In the first half of this paper is given an abbreviated
account of the biology of the spur dog.
In the latter half of the paper the Norwegian
dogfish taggings are dealt with:
a. A short description of the tags used.
b. Short accounts of the different tagging cruises.
c. The general migration route seems to be betvveen
the Shetland-Orkneys (summer) and the
Norwegian west coast (winter). Recaptures
from the Shetland taggings are recorded also
in the Vestfjord (arctic circle) and in the
Barents Sea (Thor Iversen Bank).
d. The yearly fishing mortality runs about 7 %·
e. The natural mortality appears to be about
20 % per year.
f. The stock on the Norwegian
fishing grounds (Jan.-March
1959 & 1960) is estimated to
roughly 100 000 tons.
g. Some peculiarities in the recapture
pattern this summer and
autum (1960) indicate that a substantial
portion of the stock has
remained in Norwegian coastal
waters throughout the year.