Translation Series No.1211

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per cent). Furthermore, there are complicated external effects on the
figures for the amount of the stock that cannot be eliminated entirely.
Therefore, the first result of the stock estimations is not satisfactory.
However, we are to find two criteria on hand of which it will be possible
to establish the value of the investigations and that allow to make a second,
probably better, estimate.
In recent years R. endler (1958-1964) has made salmon inves-
tigations in Germany. He has worked principally on a special statistics
of the number of fishing cruises and. of the landings at the Kiel sea-fish
market in regard to their composition according to weight categories and
concerning their amounts in different years. An earlier paper (R. Kândler
and M. Whmann 1957) concerned age determinations during the three catch
periods 1952/5 to 1954/5. However, the length7groups were not taken into
account according to their relative frequency in the catches in these in-
vestigations. Such quantitative data were required for the present work.
During the six fishing periods 1957/8 to 1962/3 I have supplied
86 cutter captains with diaries for daily entries of catch results and con-
ditioneof the environment. In this way entries for more than 7000 fishing
days could be worked out. These communications were supplemented through
the participation of scientists in 13 fishing cruises with a total of
.almost 200 days at sea. On these cruises we could also preserve the ovaries
of 70 salmon females. Food investigations were carried out at sea and in
the laboratory on 2400 salmon. From January 1958 until April 1963 samples
of scales for age determination were collected from about 7000 salmon. -
During the same period it was possible to measure and weigh more than
16,000 fish. •
These extensive investigations were supported through finâkial
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