Translation Series No.1211

IS° 16°
- 102 -
the sprat L is, besides other animals, the most important food of the
salmon. These clupeid, in turn, feed , on plankton. The starting link in
1.1).288]
this chain is represented by the primary producers, the phytoplankton,.the
production of which is governed by the nutrients. The nutrients as well
as the plankton and to a large extent also the sprat are dependent in their
occurrence on water currents (which are mainly wind-driven in the Baltic
Sea proper) and of their discontinuities (divergencies, etc.). It is also
clear to assume an influence of the wind on the offer of food. Even if we
cannot define exactly a connection between wind conditions and the occur-
rance of salmon, an indirect relation may be assumed (see 2.3.3.2.). In
this connection an example may be offered that can also give other infor-
mation.
Fig. 25. Fishing positions of salmon cutters south
of Dueodde, Febr. 22 to March 4, 1962.
From February 22, 19 6 2 on, a fleet of six to ten vessels was
.fishing with driftlines on a fishing ground south of Dueodde near the