330
.
THE SEAS
The -sherme’s Catches tell us at any rate that when the
spawning seasonarrives the herring congregate in the coastal
water;
,
.It is probable that after the completion of spawning
they move out from the coasts into deeper water, as is
testied by. the fact that they can be captured in large
_
numbers in the trawls in the deep waters off the Bristol
Channel, the Smalls Grounds.
_
_
_
We have
previously (page28o) the former
belief that after Spawning all the herring retiréd to the
"
Arctic Ocean to recuperate, whence they once more moved
.
down along our coasts in the following year to spawn.
This is generally now considered to bean incorrect view,
and it is thought that when not spawning the herring congregate into the deepero-shore water.
This has led to
the opinion that there are denite “
races ”
of herring
which keep more or less in their own regions.
Thus there
are the Baltié herring, a race of.small sized sh ; the Channel
herring from the English Channel; the Iceland, herring,
and others;
It has indeed been found that the herring
coming from widely seParated -localities exhibit certain
differences in their structure.
Notably is this the case in
the number of -ve'rtebræ the sh poSsess in their backbones.
It is generally the. case that the heing'from the coastal
where the water is of low _salinity, have fewer
vertebræ on an average than those from more saline ocean
waters.
Thus, the Baltic herring have an average of
between 55 and- 56 vertebræ, those of the western end of
_
_" the English Channel - 56 to. 57,'_ and the Iceland herring
'
between 57 and 58.
By counti‘n’g the vertebræ
_
in large -
_
numbers of.sh from different localities and studying the
age of thesh from their scales, it appears probable that it
.
-
may everitually‘be possible to traceroughly the movements '
of the various. herring races.—
_
,
.
'
-Whèn countihg the herring vertehræ -it is usual to bring
.
THE SEAS
The -sherme’s Catches tell us at any rate that when the
spawning seasonarrives the herring congregate in the coastal
water;
,
.It is probable that after the completion of spawning
they move out from the coasts into deeper water, as is
testied by. the fact that they can be captured in large
_
numbers in the trawls in the deep waters off the Bristol
Channel, the Smalls Grounds.
_
_
_
We have
previously (page28o) the former
belief that after Spawning all the herring retiréd to the
"
Arctic Ocean to recuperate, whence they once more moved
.
down along our coasts in the following year to spawn.
This is generally now considered to bean incorrect view,
and it is thought that when not spawning the herring congregate into the deepero-shore water.
This has led to
the opinion that there are denite “
races ”
of herring
which keep more or less in their own regions.
Thus there
are the Baltié herring, a race of.small sized sh ; the Channel
herring from the English Channel; the Iceland, herring,
and others;
It has indeed been found that the herring
coming from widely seParated -localities exhibit certain
differences in their structure.
Notably is this the case in
the number of -ve'rtebræ the sh poSsess in their backbones.
It is generally the. case that the heing'from the coastal
where the water is of low _salinity, have fewer
vertebræ on an average than those from more saline ocean
waters.
Thus, the Baltic herring have an average of
between 55 and- 56 vertebræ, those of the western end of
_
_" the English Channel - 56 to. 57,'_ and the Iceland herring
'
between 57 and 58.
By counti‘n’g the vertebræ
_
in large -
_
numbers of.sh from different localities and studying the
age of thesh from their scales, it appears probable that it
.
-
may everitually‘be possible to traceroughly the movements '
of the various. herring races.—
_
,
.
'
-Whèn countihg the herring vertehræ -it is usual to bring