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FAUNA.
67
cipally crustacea of the entomostracan tribe, which is numerous also in the
seas surrounding Sweden.
The water of the Baltic, which, at an early date, was a lake,
has rather a small percentage of salt. The natural consequence is that
only very few marine forms can have immigrated, so that its fauna may
be said to be poor in species. In its islet-waters, however, there live
a certain number of fresh-water fishes. In the southern part, where
the water is a little more brackish, there are also a number of real
sea fishes, of which the cod-fish (Gadus callarias) comes even far up
into the Bothnian Gulf. Without a parallel, the variety of herring
(Clupea harengus) known by the name of strömming and distributed
also over the Bothnian Gulf, is the most important product of the
fishing industry in the Baltic. Here, a small whale, the common
porpoise (Phocæna communis), also at times roams as far as north of the
sea of Aland. Among invertebrate animals there are but few forms
in the Baltic, excepting entomostracans. Towards the Sound the fauna
grows richer; and on the western coast of Sweden, in the Kattegat and
the Skagerack, we find a fully developed marine fauna.
The Eagle owl.
From a picture by Bruno Liukfoks.
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