338
THE BIOLOGY OF FISHES
diet of the Bab, though before that they prefer certain
Bivalves.
‘The Herring lives a great deal on the Crustace‘an
plankton, but at certain seasons it largely prefers thisfood
already prepared for it in the form of Sand—ed (Ammodytes).
Even the young larval shes exercise a choice when
different foods are present.
If the food is too large for their -
mouths, they do not touch it, but if they prefer a small
_
species they will leave a largerspecies alone though quite ._
able to swallow it.
When young Whiting of 16—19 mm. in
length were placed in a tank in an aquarium-, they were fed
on
Calanus and ate them greedily. But when Pseudo—
calanus and _Temora were put into the tank along With
Calanus, the Whiting took Pseudocalanus in preference.
,
“
It would neVer eat a dead Copepod and always refused
'
dead food of any kind or chopped worms. It is also very
fond of Acartia and prefers it to Calanus
”
(M. Lebour). »
Regardirig the mode of feeding of young shes this authoi‘
also writes ':
“
Some
deliberately stalk ‘ certain selected
food, others apparently eat the rst thing that comes. Some
'
feeding at all times, others only at night. . . . The Whiting,
'
of all the yoùng sh observed, is the greediest,and very 1
Clever at re00gnising the different foods and selecting the Ï
_
best'rst. The Pollack comes second.“ These stalk their
f00d, “usually Copepods, coming up behind and giving-1e
curious sideways dart so that the Copepod is swallowed
’
head rst.”
'
.
.
:
*
'i
,
_
'
;_
As soon 'as-“they are old enough to make their way against
'
this they are able “to
at a remarkably
,
little jshes separate and make for dierent
,'
}“grouhdS Or_ÿvatersgr
Schmidt ha's provided a classical
example of.ïthisÏform..of select—ion“ inithe case of the Eels.
,
The Leptôé<æphäli-_'=o’f
and …European -’Eels
'
keep company tOgetherri‘n the Gulf. Stream as far as oif the
.
-
Bermudas, then the,
for the weSt—, the
;
“European Eel for the “east. =_The young of the. Flat—shès
distribute themselves— "“in a similar ‘ï manner ,; ::the : Flounder '
into . bra“ckis‘h and: fresh water,
the coast,
Ethe- “LemonëSOlt—ï further ’oîut:in
Water, — neÿer . ihghgfe,'
THE BIOLOGY OF FISHES
diet of the Bab, though before that they prefer certain
Bivalves.
‘The Herring lives a great deal on the Crustace‘an
plankton, but at certain seasons it largely prefers thisfood
already prepared for it in the form of Sand—ed (Ammodytes).
Even the young larval shes exercise a choice when
different foods are present.
If the food is too large for their -
mouths, they do not touch it, but if they prefer a small
_
species they will leave a largerspecies alone though quite ._
able to swallow it.
When young Whiting of 16—19 mm. in
length were placed in a tank in an aquarium-, they were fed
on
Calanus and ate them greedily. But when Pseudo—
calanus and _Temora were put into the tank along With
Calanus, the Whiting took Pseudocalanus in preference.
,
“
It would neVer eat a dead Copepod and always refused
'
dead food of any kind or chopped worms. It is also very
fond of Acartia and prefers it to Calanus
”
(M. Lebour). »
Regardirig the mode of feeding of young shes this authoi‘
also writes ':
“
Some
deliberately stalk ‘ certain selected
food, others apparently eat the rst thing that comes. Some
'
feeding at all times, others only at night. . . . The Whiting,
'
of all the yoùng sh observed, is the greediest,and very 1
Clever at re00gnising the different foods and selecting the Ï
_
best'rst. The Pollack comes second.“ These stalk their
f00d, “usually Copepods, coming up behind and giving-1e
curious sideways dart so that the Copepod is swallowed
’
head rst.”
'
.
.
:
*
'i
,
_
'
;_
As soon 'as-“they are old enough to make their way against
'
this they are able “to
at a remarkably
,
little jshes separate and make for dierent
,'
}“grouhdS Or_ÿvatersgr
Schmidt ha's provided a classical
example of.ïthisÏform..of select—ion“ inithe case of the Eels.
,
The Leptôé<æphäli-_'=o’f
and …European -’Eels
'
keep company tOgetherri‘n the Gulf. Stream as far as oif the
.
-
Bermudas, then the,
for the weSt—, the
;
“European Eel for the “east. =_The young of the. Flat—shès
distribute themselves— "“in a similar ‘ï manner ,; ::the : Flounder '
into . bra“ckis‘h and: fresh water,
the coast,
Ethe- “LemonëSOlt—ï further ’oîut:in
Water, — neÿer . ihghgfe,'