Translation Series No.1211

"ervoct.
Yeer-Le-
-e-t.
'4.y-c.1*.e.,s
2nd 3rd 4th 5th 6th 7th 8th 9th
7 131 -
compare the four year's sets 1954 to 1957 on the basis of three fishing
periods. According to this, the smolt age was 2.7, 2.4, 2.9 and 2.8 years.
That are rather . considerable deviatiensamditds questionable whether such
fluctuations, when the share of every river remains the. same, can be at-
tributed to changes in all rivers, or whether they are to be attributed -
to changing shares of thé rivers.
[p. 308]
It has already been shown (4.1.2.) that the salmon of the nor-
thern Gulf of Bothnia show the tendency to migrate later and not as far
to the south than fish from more southerly rivers. In this connection we may
• yefee7cLues
Table 32. Mean smolt age of different j.earLs-gete in the sea
in consecutive years.
1950
1951
1952
1953
1954 •
1955
1956 .
1957
1958
1959
1960
1,0
1,0
1,1
• 1,1
1,1
1,0
1,0
1,0
,
1,9
1,9
1,8
1,9
1,9
1,9
2,6
2,8
2,6
2,9
2,9
2,7
3,1
3,4
3,2
3,4
3,7
3,3
3,4
4,1
3,8
4,0
4,6
3,6
3,8
5,0
3,7
3,0
3,5
3,4
3,0
.
.
• -
Me an
smolt age 1,0 . 1,05- 1,88 2,75 3,34 3,92 3,73 3,0
Difference 0,05 0,83 0,87 0,60 0,57
make a comparison with the figures for smolt ages by G. Alm (1928a).
Rivers north of 65 ° N . had an average smolt age of 3.15 years in 1915 to
1944. The corresponding value for rivers between 61 ° and 64 ° N was 2.54
years.and in the lerrum, 56 ° N (1919 to 32) it was even 2.03 years 1 3.
13 It is possible that the actUal smolt age has been lower - in all regions,
on account 6f the mortality dependent on size; however, the values remain
comparable with one another and aléo . with the data presented here.