Translation Series No.1211

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of the stock. In the course of the summer a new crop of smolt (fish, which
emigrated from the rivers in the same year) joins the exploited stock (see
5.3.1.2.). This process is not reflected in the records of yield according
to calendar years, because two different stocks are sampled at the beginning
and at the end of the year. -
The monthly trend of the average weight points also to the
changes in the.exploited stock (Table 17). The figures increase from Sep- .
constant until March and begin - to decrease
in April. The incXease at the beginning of.the season is a consequence of .
s the growth, although here other causes may play a role. The decline of the
values that begins in April points'to the emigration Of the large salmon.
In some years there occur deviations from these average events.
The Danish share in the pelagic fishery in the Baltic Sea amounts .
to more than 60 per cent, whereas the other countries have each an 11-per •
cent to 14-per cent share in the landings. The largest landings of more
than 2000 t or more than 500,000 salmon were reached in 195 6/7, 1960/1,-
and 1961/2. The emallest yields occurred in 1957/8,and 1959/60 with. about
1350 t or 300,000 salmon.
The yeiarly trend of the landings (Table 18) shows that‘the
.fishery reaches a peak at different times in the individual countries.
Denmark and Germany have the highest yields in the winter months from Nov-
ember to January. On acCount of inclement weather, the landings in Februare
are often gmaller. This was especially pronounced during the 1962/3 season
in the German fishery, becauselthe cutters had to stay in harbour from
January until March on account of the iCe cover. When the water begins to
warm up, the yield begins tà diminish in March.
The fishery takes . a very different course in SWeden and in Poland.
tember to January, they remain