Translation Series No.1211

Sin%
0,1 2,8 37,0 96,8 100,0
- 147-
If we compare these results with the series - of Swedish measure-
ments of lengths in ascending salmon (Fig. 22),'we find that the bulk of
the ascending fish here also is formed • y the sea year class A.2+. The
fish that migrated already in their second year in the sea (A.1+) are
grilse. Of the older groups, the sea year class A.2+ on the one hand and
the classes A.3+ to A.5+ on the'other form each a maximum in the frequency
distribution of the Swedish series of length measurements (3.2.3.).
If one collects together correspondingly the age groups of the
Table 37 and neglectF the grilse, then the sea.year class A.2+ constitutes
a share of 64 per cent. F. Chrzan (1959) found on an average during the
years 1945 to 1955 the share of the sea year class A.3+ to be more than
60 per cent.
Table 38. The share of the salmon with spawning marks in
the sea year clsses.
Year of Age groups
-
invest- A.1+ A.2+ A. 3+ A.4+ A.5+ Total
igation Tot. .8 Tot. S Tot. S Tot. S Tot. S Tot. S
1958 725 521 16 77 18 11 10 1338 44
1959, 558 2 186 17 22 14 775 33
1960 646 2 618 17 37 15 7 7 2 .2 1317 43
1961 1026 1 286 3 14 7 1 1 1 '1 1329 13
1962 979 96 2 3 2 2 2 2 2 1082 8
1963 724 342 3 20 8 10 10 1103 21 .
Summe 4658 5 2049 58 173 64 31 30 5 5 6944 162
8 = salmon with spawning marks [Summe = sum]
v/
In the age determination the salmon with spaipng marks have been
incorporated inte the sea yeax classes according to the length of life they
spent after their transformation into gmolt. Since the spawning maturity
is dependent on the condition and thus can fluctuate annually and since
the spawning fish are subjected for about one year to quite different
2,3