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I. Stattonary fishes, which live all their life in our seas. — 
II. Migratory fishes, which do not live all their life here, but at certain 
times stay either im the North Sea, Skager-Rack, or in the Baltic Sea. — 
It will be understood, however, that the very same species of fish may 
sometimes be classed with both of these groups, as some of its individuals 
will always remain with us, while others will sometimes emigrate. About 
this, more, later on. — 
The Stationaåary Fishes are again to be divided into several groups: 
a) Stationary fishes in the fjords or, at any rate, within Danish territorial 
waters. They are closely attached to the places where the zostera grows. 
They deposit their eggs on zostera, stones, or similar things, or they are 
viviparous. 
OF more useful fishes belonging to this group is to be mentioned only 
the eel-pout; but there are also the gobies: Gobius niger, G. flavescens, G. 
microps (G. mimutus?), various pipe-fishes, the fifteen-spined stichleback (Spina- 
chia), and stickle-backs (Gasterosteus aculeatus). 
With this group may be classed also two animals that are not fishes, 
the prawn (Palæmon) and the oyster. We must not forget, however, that 
the oyster lives also outside our torritorial limit; but those which live in the 
Limfjord, naturally, will stay there all their life, though part of the fry, no 
doubt, may drift out of it. 
b) This group of stationary fishes comprises only the eel. It lives 
mearly all its life im our fjords, or near our shores, in the zostera and in - 
quite fresh water. This fish is stationary with us, from it is a little 
young one, 2!/, inches long, till it is a full-grown silver-eel; which means, 
certainly, not a few years; but then it leaves our territorial waters and the 
fresh waters in order to breed, and never to return any more. 
c) This group comprises fishes which iive, partly m the fjords and 
partly in more open waters, but which never leave our seas within the 
Skaw. They have floating (pelagic) eggs, which are generally hatched out- 
side the fjords, on the open shores, where we may also find the fry; that 
of the plaice, the /lounder, the turbot, the brill, and the sole, on lower water, 
that of the dab on deeper water. It may be supposed that several of these 
fishes migrate around the Skaw, particularly from without into the Cattegat, 
and no doubt a great many plaice also go through the Belts from the 
Baltic Sea up towards the Isle of Anholt. These individuals which thus 
migrate, ought properly to be classed with the migratory fishes, but, never- 
theless, all in all the species plaice must be reckoned among the stationary 
fishes. It never quite .disappears from our waters like e. g. the cod or 
the herring. We can always, at the right places, find the plaice living in 
our seas in great numbers all the year round. 
d) Salmon, trout, gwimiad, and smelt have a peculiar way of living 
as stationary fishes: they spawn in fresh-water, and live during the remaining 
