'
THE FOOD QUESTION.
;31‘3
shes are strictiyvegÏetàrians, but some .ofthe Spatoids;bf
the
tropics are said to liVe
.Fucim and Zostera.
_
which live among the -seaweed,
chiey;îon
and Craysh, Whilst
grüb- on
the polyps ofthe corà1$.
…
,
»The freshwater shè5 have
a
'
diet as the marine,;and
reason why
most of
to
the mud on the bottom.
Some afe
*idea’- that the- Carps keep to
.
vegetable-{dietha‘s_prôvednot
.‘Carp ofEuropean waters
earpio) _is really bmni—
_
apParently it must eat plant «stuff to obtain
_
Inseet‘s, ante), bees, ies and
‘
ggrufbs',form' the chief diet of freshwater shes and they
help to keépdown the numbers of these peste. In Central
America and the _West Indies the Cyprinodonts feed on the
ia_rVæ' of mosquitos and have been foundeXceedingly
'
usefulain
‘
.
from; the b1teofthemosquitos,bywhlchvanousFlagdläœs
'
.
-
'
.
heavymortahwamonghuman
The introduètion’
‘
Ït'fbf. î’ÿ-àriôiiè‘ Amenean
especially. Girardihu’s
-
imc: the
the.
'
done a'great deal to
!
Of malaria.
,
*
,
'
__
.
—
_
_.
2. THE VÀLÙATION OF THE
.
,
Ï
,
‘
,__Since the shes depend for their food” on the lower
fœmsof life in the waters, the quantities of the…1atter must
quantity of the sh. -1f now We Wish
,
'
sh live within a given area, fthe;sinipiesb ,
_
procedure would seem to be to determine,
’
amount of::
present; . Where
.
under control
the; rearing of T
in '
-’
Ï "ponds_,g:piæiçultùrists : Œftelï
mœtytheamwm ç°f'
.
,