'
THE HABITS
.FISHES
"
37
deep water in the” neighb0urh‘obd and many intothe fjords
(Damas); ”but the Herring seem to collect into enorm0us
shoals when about two years hold, and then make their
appearance far away fr0m
:This
.
concentration cannot be…Wholly explained< by referenCe: to'
the currents.
Cod, Green Cod, and‘othér sheshave
a goodreason for:collecting together,-‘for
Herring; but what causes the”. Herring to wander together
in such quantitiesand to such distances?
_
;
-
'3
.
—
,
In
North ‘Sea'the Herrifig, has also presented many
hard problems --to the scientists. _— It is no longer believed
that theyrriake extensive,-waderings——at least,
as far
as
the ice—oes of Greenland ‘as was formerly thought.
_
Nevettheless,- count—less millions disappear from __sight,
almostÏas if they did not exist; and some have. imagined
that; mysterious inuences may be behind Some of the
phen_0meha, the change in the shing grounds from bygon€
and the seemingly long—period uctuations :in jsome of
the sheries. ,, For-?many years now “the great spring and
_
'
—'Summerü ?shin‘g along the east— coast of Scotland ‘anvaorth
,
England…has been ;very£eoStant With: no reduction; in=the ,
.
_qu_antities‘g çiÏ:Ï Atthls time the Herring have concentrated to
—
vast community or-ra‘ceg ‘(johanSen)’orÊ=to.:severalÿÿ(Heinclæ). —
After feeding they spawn and
Once
but within recent years large quarltities have been taken
during the summer and autumn months by trawlers shing
ifl’thê-WCSÏCI‘H and northern parts of the North Sea (Borley
and Russell), and later "in the winter in theSkager
'Itçappears therefore-that these Herring live mainly in the
North Sea region thrOughout the year.
,
,
.t
Ï-…
Similar phenomena. ate displayed by thetHerri“ng ’onzall'
the continental slopes of the Northern =HemisPhereï
,
_
appear at certain times and places—{Or the purpose—of feeding; .
'
Î
at
purpose of,
easy to
betwee3the tWo_.«
=
ha'YC_ '_Îh'Oughf
.
that their movements
..