.THE FOOD QUESTION
327
sooner than the females ; further, they are more active and
do not always frequent the same grounds as the females.
Hence different areas and different seasons give dierent
results.
Who can tell the normalproportion of the sexes
inthesea?
,_
_
A picture of the immense quantities of young Plaice
which crowd yearly into some of the shallow waters of the
Eastern North Sea has been given by Lübbert (1925). In
a
small area at the mouth of the Elbe, shing with a
shrimp-trawl of 27—foot head-line, he obtained from 300
up to 1,000 Plaice in hauls of 15 minutes’ duration in the
months of May to October 1922.
These were all less
than two years old,
born in the years 1921 and 1922.
In September and October the great majority belonged
to the 1922—group, thus to the time when the accumulated
war—stock had already for the most part been
shed up.
The destruction of young Plaice in certain parts of the
NorthSeahas been
longtime, but every
Ï new investigator is irhpresæd by the great waSte andwould
like to ndsome means Ï0f- stopping it. How. old the
practice is _may be judged.from the. words written by Holt
,in 1893 : ΑrMy information goes to the :eect that the
destruction of small sh on these grounds had
’, beenÿgoing on for many years (ever since about 1830, when
_
British trawling vessels seem rst to have taken to shing
the Dutch grounds) before it attracted public attention.
It escaped notice for this reason,” that as long as the
supply of ne sh held out, the small ones, which were -
at least as numerous as they are now, were shovelled over—
board, and thus never made their appearance in the market.
,The same thing is going on at the present day, only the items
of the catch which are too small for the present market are
‘indeed minute.”
'
'
'
,
’
,
_
These examples will serve to Show hoW'c0mplica‘te‘d the
problems of the sheries are. One“
whether they are :to be solved bythe miCroscopic methods
necessary for the_exact determination
of details.
It 1s
327
sooner than the females ; further, they are more active and
do not always frequent the same grounds as the females.
Hence different areas and different seasons give dierent
results.
Who can tell the normalproportion of the sexes
inthesea?
,_
_
A picture of the immense quantities of young Plaice
which crowd yearly into some of the shallow waters of the
Eastern North Sea has been given by Lübbert (1925). In
a
small area at the mouth of the Elbe, shing with a
shrimp-trawl of 27—foot head-line, he obtained from 300
up to 1,000 Plaice in hauls of 15 minutes’ duration in the
months of May to October 1922.
These were all less
than two years old,
born in the years 1921 and 1922.
In September and October the great majority belonged
to the 1922—group, thus to the time when the accumulated
war—stock had already for the most part been
shed up.
The destruction of young Plaice in certain parts of the
NorthSeahas been
longtime, but every
Ï new investigator is irhpresæd by the great waSte andwould
like to ndsome means Ï0f- stopping it. How. old the
practice is _may be judged.from the. words written by Holt
,in 1893 : ΑrMy information goes to the :eect that the
destruction of small sh on these grounds had
’, beenÿgoing on for many years (ever since about 1830, when
_
British trawling vessels seem rst to have taken to shing
the Dutch grounds) before it attracted public attention.
It escaped notice for this reason,” that as long as the
supply of ne sh held out, the small ones, which were -
at least as numerous as they are now, were shovelled over—
board, and thus never made their appearance in the market.
,The same thing is going on at the present day, only the items
of the catch which are too small for the present market are
‘indeed minute.”
'
'
'
,
’
,
_
These examples will serve to Show hoW'c0mplica‘te‘d the
problems of the sheries are. One“
whether they are :to be solved bythe miCroscopic methods
necessary for the_exact determination
of details.
It 1s