Translation Series No.1211

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yeAy-ctt4
thé explanation for the low smolt age that is shown by the yèeele-eet of
1955, we have to suppose that the main cause.was that the smolt emigrated
earlier. If we assume as before that the share of the northern salmon (be-
eiond 65 °N) was 25 per cent and if we assume further that they emigrated
0.3 years earlier, we obtain with the•aid of Alm's (1928a) average values
for 1915-1944:
Smolt age north of 65 ° N 1 3.15 years - 0.3 years = 2.85 years
Smolt age 61° - 64 °N 1 2.54 years - 0.3 years = 2.24 years,
total average weighted smolt age 4 2.39 years.
s{Cee — elitSSGS ,
Let us now make a comparison of the strengths of the yeealls
'Pe t . In order to include as many of them as possible, we shall again use
as basis the figures for the fourth to sixths years of life. It has already
been pointed out earlier (F. Thurow 1960) that the ye;45.2e4 of 1953 was
very rich in individuals. Only fish in their fifth and sixth year of life .
have been used in Table 31. Nevertheless, we shall•attempt to include them
- cUss
in the comparison as well as the fish of the yeel-e-eet of 1958. With the
aid of Table 31 we can state that on an average 26 per cent of the total
number of the fish in their fourth year of life are caught and an average
of 18p cent of ihe total nUmber are caught in their sixth year of life..
yew- s 5 •
In order not to overvalue in the comparison the yéar's set of 1953, we f-
shall assume that the share in the fàurth year of life is only 16 per cent.
yet.y--chas .
Wé shall apply to the yearlo pet of 1958 the intentionally reduced percenr.
tage of only 15 per cent for the sixth year of life. Thus are obtained the
sie&Y- tb,ts
comparable figures for the six yintr-1-a--ee4a. from 1953 to 1958 in Tkble 31.
yeey: eha se
According to this, the yéeel7e-aete 1953 and 1954, with their high yields
of almost 14 ealmon.Per 1000 hooks stand far aboVe the group 1955 to 1957,
which is in coniparison rather uniform (about 11 salmon Per 1000 hooks).
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