Translation Series No.1211

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increase'in weight is more retarded dUring the winter than the increase
in length. The •two different processes, the predominance of the increase
in weight in summer (rise in condition) and the predominance of the in-
crease in length (loss of condition) in winter regulate the changes in
the length/weight coefficient K (Fig. 37).
•Yeefe - ei"-s 5
. If one follows the performances of each individual yeer-Le-ect,
one finds - very different. forms of the course of- growth (Table 44). The
'yeef-a.sse • -
yeaele,--s494e 195 6 and 1961 attained as•sea year class A.1+ in November the
Very small average length of 68.7 and 68.3 cm, respectively. In contrast,
all other ye-aels. were already over 70 cm long in November as A.1.
Thus the yee,r'o act of.smolt of 1957 had a length of 74.1 - cm as A.1+ in
•November and so was 5.4 cm longer than the year's set of 1956 in the
s.
previous year. The yeeple-set of 19 5 6 managed to reduce this difference
to 1 cm, bees:Use it had Made an average gain of almost 9 cm in length.
yek.m-e..144:
On the other hand the year's cot of 1961 grew during the winter by only
6 cm and that of 1960 even bY only 4 cm. Especially outstanding is the
performance of the et1=tj4t of smolt of 1959 that has been peinted Out
. by Kandler (1961). This ye,aele-ae4 was 80.5 cm long as A.1+ in January .
1961 and had thussgrown at least 5 cm more than any other e444-%-e4
Surprisingly, this advantage finds no longer an expression ,in the4ssea
Year - claas A.2+ (1961/62).
• The growth in the sea is dependent predominantly.on the duration
of the -sojourn in the sea. As is 'shown in Table 43, the influence of the
brood year's oc t is still plain; because the mean lengths increase in
general witnin . a sea year class with increasing duration of the stay in
' the rivers. On an average, during the years 1958 to 1963 the difference
- between the'age groups 2.1+ and 3.1+ is about 1 cm. This phenomenon has