i3 
cod come in again. They are evidently fond of our shallow little waters, 
which are so rich in food, and only leave them when the heat and the 
light become too intense. Everybody knows that the cod-fishery in the 
fjords rests during the whole summer, and is carried on only at a few deep 
places with many currents, as for instance in the deepest parts of the 
LittleBelt, at the Isle of Hjælmen, etc.; as also that the trap-fishing on low 
water becomes very active, as a rule, in September. This is, no doubt, 
owing to the above mentioned migration from the low water out to the 
deep water, and afterwards to the reverse migration from the deepest regions 
inwards. It is as well known, however, that the frost in winter can drive 
the cod out of the fjords in the course of very few nights, so that the 
fishermen, sometimes, can get a good catch of codfish in traps during the 
emigration; hut all these migrations, most likely, are of rather a local 
importance only, and not of any very great extent; though in such long 
shallow seas as the Limfjord, they must extend over several miles. At 
certain times of the summer this fjord is almost empty of cod; but every 
autumn so many generally get in through Thyborøn, and go past Aalborg, that 
the fishermen can catch some 200,000 Kroner's worth of cod every winter. 
The rich fishery in this fjord is remarkable, when we remember that every 
cod, plaice, and eel, most likely also every herring and many other fishes 
that are caught in there, must go in through its narrow mouths, either as 
small or large fish. These mouths are so narrow, indeed, that we might 
easily close them with some fishing-apparatus and thus catch all the fish, 
if not the strong current made it impossible. This seems to me a clear 
proof of a great predilection among the fish for entering our little seas, 
which are so rich in nourishment; in spite of all hindrances they go in 
there to find their food. To breed in there, however, is generally impossible 
for. them. 
The cod in our seas, however, makes also other migrations than the 
above mentioned shorter ones. It must not be imagined that all our codfish 
immigrate into our seas as small fry, a few inches long, to grow up there 
and remain there for ever. On the contrary. There is no doubt that great 
multitudes of half-large and very large cod go in here, every year, from 
the North Sea. This immigration commences already at the same time as 
that of the fry. But just at midwinter time it seems to become very lively; 
then the large cod of 20—30 Ibs. arrive in the Little Belt, for instance. — 
Just at that time also the large cod arrive on the Norwegian shores. 
In the autumn many other fishes also immigrate into our waters, more 
particularly such codfishes as at other times do not occur at all in the Belts, 
e. g. pollacks and wlutings; nay even the haddock will pretty frequently go 
far into the Little Belt and, it is said, in some years into the Sound. With 
respect to these fishes the immigration is easily proved, because they are 
generally quite missing in the Belts the whole summer. I shall here remind 
the reader that the /erring-fishery in our seas within the Skaw becomes 
