FlSI—IERY RESEARCH
327
up showing the relative frequency of the animals from
one spot to another.
Such research has been carried out
in many localities and it has been found that compared
With other places the Dogger Bank is surprisingly rich in
these shellsh.
The effect of this abundant supply of food
has been shown-in a very striking manner.
A large number
of small plaice were caught off the Dutch coast and marked.
Ôf these one half were liberated again at the spot at which
they were caught, but the other half werekept on board
_
the research ship inspecial tanks and transported up to.
the Dogger Bank, Where they were allowed to go free.
After a time these marked sh began to be returned by
the shermeh.
Examination revealed the fact that those
,
that had been liberated on the Dogger Bank grew very
much faster than those that had been. returned-to their
place of capture off the Dutch coast._ This great growth
is to be correlate'd with the great amount of food
on the Dogger grounds compared with that of those of the
Dutch coast.
.
.
,
m
-
‘
'
These results haVe suggester that it might 'be a practical
proposition to transplant large numbers of sh and so
increase the resources of the _North Sea—.
There are un_
'
'
fortunately one or- two obstacles in the way, such as a
-decision as to who should bear, the cost of the transplantation, and the expense- necessary for patrollmg the
gr0unds immediately afterwards
prevent
eager
,
shermen from at once shing up all the newly arVed
"
plaice.
'
-
'
'
"
-
One of the most instru‘ctive results of theSe and similar
5 .
”marking experiments is to draw attention
thÇ_ grave
»
”
risk that is now being incurred of depleti€ the
,
,
plaice in the North Sea.
Within & year of liberation QVer
‘_ '
'
._
,
& quarter of the marked sh are re0aught, 2 50 to 300 out
‘
'
.
of every
1,000
marked plaice . being ïeC_3Ptuœd- Ïh15 '
327
up showing the relative frequency of the animals from
one spot to another.
Such research has been carried out
in many localities and it has been found that compared
With other places the Dogger Bank is surprisingly rich in
these shellsh.
The effect of this abundant supply of food
has been shown-in a very striking manner.
A large number
of small plaice were caught off the Dutch coast and marked.
Ôf these one half were liberated again at the spot at which
they were caught, but the other half werekept on board
_
the research ship inspecial tanks and transported up to.
the Dogger Bank, Where they were allowed to go free.
After a time these marked sh began to be returned by
the shermeh.
Examination revealed the fact that those
,
that had been liberated on the Dogger Bank grew very
much faster than those that had been. returned-to their
place of capture off the Dutch coast._ This great growth
is to be correlate'd with the great amount of food
on the Dogger grounds compared with that of those of the
Dutch coast.
.
.
,
m
-
‘
'
These results haVe suggester that it might 'be a practical
proposition to transplant large numbers of sh and so
increase the resources of the _North Sea—.
There are un_
'
'
fortunately one or- two obstacles in the way, such as a
-decision as to who should bear, the cost of the transplantation, and the expense- necessary for patrollmg the
gr0unds immediately afterwards
prevent
eager
,
shermen from at once shing up all the newly arVed
"
plaice.
'
-
'
'
"
-
One of the most instru‘ctive results of theSe and similar
5 .
”marking experiments is to draw attention
thÇ_ grave
»
”
risk that is now being incurred of depleti€ the
,
,
plaice in the North Sea.
Within & year of liberation QVer
‘_ '
'
._
,
& quarter of the marked sh are re0aught, 2 50 to 300 out
‘
'
.
of every
1,000
marked plaice . being ïeC_3Ptuœd- Ïh15 '