Translation Series No.1211

- 170-
(a) the good grciwth . of the year'aet of smolt of 1959 took place for the
cf.4e,s
first time in the sea. All age classes of this year'e set must then
dees
have grown very well . No' age group of other yearPss, ee ts should show
a similar result.
(b) The good growth was induced already in the rivers. Only one brood yearm-fd
has grown up under optimum conditions and has later as one of the
age groups 1.B to 5.B exerted a decisive influence on the mean length
ae,“
and the mean weight of the year",>s 'eet of smolt of 1959: The other age
groups do not show such outstanding results of growth.
d. [p. 331]
(c) The good growth was induced in the rivers. Several brood years ee4s
did live under favoilrable conditions and constitute the cause of the
CIAS
good growth of the year"R--eet of smolt of 1959. Therefore, several of
its age groups show special gains. Since the age groups in question
did not only contribute to the formation of the year's, 'eat of smo.1À
of 1959 , but formed also age groups of other year's eets, these.also
should shoW good results.
• eisv-6ie't4S
Let us now follow the brood yeerem-ee4s during the corresponding
cLees
years. The age groupS of the year'sr-eet of smolt of 1959 are made up of
c-1,,Ç es
parts of the five lœood year't-rete 1954 to 1958.
-ctas4cs
As is shown by Table 45, four of these brood year'b bets take
-ciass
part in the formation of the . yearl-e-eet of smolt of 1958. If growth-prom-
oting influences were active in the rivers during the period cited, then
they Should be apparent almost as strongly in the yearie-tôf-âmet'.of
1958 as in that of 1959. Let us inspect Table 43 in this connection and .
-d&ases
compare the mean lengths of the age groups of the year 's-re-S. of smolt of
1958 (January 1960, age group 1.1+ to 5.1+) and of 1959 (January 19 6 1,
elos
age groups 1.1+ to 5.1+). It is seen that the fish of the yeare-e-eet of
•gmolt qf .1958 are very much smaller and show in comparison with the age