Translation Series No.1211

- 144' 7
margin (Fig. 33). In those fish that survive the migration and that manage
to return to the sea, this resorption zone is usually plainly visible. It
is called the spawning mark.
Fig. 33. Scale of salmon with spawning
mark, 91 cm, 2.2G1. (After B. Carlin.)
The ntimber of fish with spawning marks that were found during
age determinations has occasionally been employed for the evaluation of
the composition ofe the stock in order to denote the waste. In Table 36
have been assembled the data of F. Chrzan (1956b) and of R. K4ndler . and
M. Liihmann (1957) together with the present data.
F. Chrzan found during the season 1947/48 a very high value of
11.2 Per cent. The figure can perhaps be considered to be accidental, be-
cause in this period a total of only 260, mostly large, salmon were ex-
amined. For the rest, the fluctuations are rather small. G. Alm (1934)
already -found in the catches in the Baltic Sea a figure of 3.2 per cent.
F. Chrzan (1959b) ascertained an average value (1945-1955) of 3.7 per cent,