'
34°.
»
1'.THE SEAS
generation at îany rate willbe thankful that research Was
started so many years ago, for ocean'ographical research
is but in its infancy. At this day it is little more than
fty years of age, and in fact it is only in the twentieth
century that sufcient observations of a routine nature
have been' collectedfor comparison with future years.
'
It seems doubtful whether ma‘n will ever Succeed in
_
actually increasing.the productivity of the sea, although
even
that may not be outside the bounds of possibility."
At any rate it is improbable that'sh-rearing carried out
on
its present scale will
.
produce any appreciable effect
on the sh population; for what are the few million young
liberatedto the many,million already present in the sea ?.
It is certâ.inly-desirable that they should bereared to more
'
advanced stages than .is at
._
present
_Whethel‘.
eventually sh hatehing and rearing could be'carried out on
.
sufciently large a scale to produce any economic results
the future must decide; at least _at the present day the
’
capital expense of such an undertaking precludes its
possibility.
.
.
—
-
=
It has been shown that'the main cause,o£the productivity
,
of a given area lies 'in the quantity of dissolved mitrient—
.
salts present inthe upper Water layers…(page
and an
increase in these salts would probably give rise to a
abundance ofshlife. It maybe that in years to come a
.
means forso doing will be found : there is a _vast reservoir
of nutrient material in the deep waters of the oceans to be
drawn upon. Already the manuring of estuarine waters has
been suggested as a practical means;of improving shellsh
cultivatio.
—’
'
-
.
,
,
,
-
_
‘
_
But the” aims .at, the present day must -lie rather. in,
estirhating .the limits to Which : the sheries
bear
depletion; and in. Collecting information that will enable
a forecast of
shery _to be madesome time
in adVance..
Beÿon‘d‘thàt it is premature to'express opinion»
34°.
»
1'.THE SEAS
generation at îany rate willbe thankful that research Was
started so many years ago, for ocean'ographical research
is but in its infancy. At this day it is little more than
fty years of age, and in fact it is only in the twentieth
century that sufcient observations of a routine nature
have been' collectedfor comparison with future years.
'
It seems doubtful whether ma‘n will ever Succeed in
_
actually increasing.the productivity of the sea, although
even
that may not be outside the bounds of possibility."
At any rate it is improbable that'sh-rearing carried out
on
its present scale will
.
produce any appreciable effect
on the sh population; for what are the few million young
liberatedto the many,million already present in the sea ?.
It is certâ.inly-desirable that they should bereared to more
'
advanced stages than .is at
._
present
_Whethel‘.
eventually sh hatehing and rearing could be'carried out on
.
sufciently large a scale to produce any economic results
the future must decide; at least _at the present day the
’
capital expense of such an undertaking precludes its
possibility.
.
.
—
-
=
It has been shown that'the main cause,o£the productivity
,
of a given area lies 'in the quantity of dissolved mitrient—
.
salts present inthe upper Water layers…(page
and an
increase in these salts would probably give rise to a
abundance ofshlife. It maybe that in years to come a
.
means forso doing will be found : there is a _vast reservoir
of nutrient material in the deep waters of the oceans to be
drawn upon. Already the manuring of estuarine waters has
been suggested as a practical means;of improving shellsh
cultivatio.
—’
'
-
.
,
,
,
-
_
‘
_
But the” aims .at, the present day must -lie rather. in,
estirhating .the limits to Which : the sheries
bear
depletion; and in. Collecting information that will enable
a forecast of
shery _to be madesome time
in adVance..
Beÿon‘d‘thàt it is premature to'express opinion»