“29Q'.
'
THE momo—v OF FIS—HES
,
_
possibility of-QOne sex Changigg-into another brings
.
,
_us to
of the meaning of secondary sexual
-
These are the outcome of seXuality ; - quite
-
apart
the special organe the males frequently have a
different appearance and dierent. structures from“ the
’
In other groups _of Vertebrates these di'er'ences
are usually of a constant character; the males are larger
__
'
”with distinctive ’markings, the females smaller and plainer ;
but in shés the range of variation is very
.
Among the marine Téleosts external sexual differences
'
are seldom apparent, the sexes of the Gadoids, Clupeids,
Scombroids, etc., are precisely alike; But among the—inshore
,
forms, particularly those that live among the seaweeds like—;—
'
‘
the Labro‘ids, the males show a mOre brilliant coloration than
'
the fetales during.the spawningseason. In the Dragonet
'
"
Calliahnus,the 'male is much the larger, with longer
:
S'nout and d0rSalnS, whilSt_ the body during the breedîng
°
season becomes ornamented with yellow and
-_
‘
the female remaining of a dull greyish—yellow. In an Indian
,
however, it is the female that is the more: 'brightly
Ïco_lou’red. In the Elasmobranchs.— the colour is ”net i"dis—Ï
tinëtive_of the sex, but the basal part of the ventràl or "pelvic
ï
ns in the males is used as aclasper to keep hold of thé.female
;
during pairing ; in the Chirhæras_ there—is a secondlclasper
'
'
infront of the ventral n and Still a thirdon the top
_
,
'
__head. During pairing the
his body around Ï_'and
Ï
“lengthWisC alog;the body ,_of
': f »
rest
gb ackofthe
The male
has no
-.
headclasper ,.
"
'
'
,It".is5amongstithef‘freshwaterîËTële'osts; hOWeÿer, that the
?
-seäùà1};characçersjaireiïmést
and" every
part of the male ;sh*from the mouth to the tail is affected,
'
.
naturally,
in different
'
Usu‘allÿ
that are longer in the male,sorhetirés,
‘
'
however,,the ventràls= or the d0rsal and even the Ïca'udal.
The COIOÎa‘CiOnOfÆhe male may be remarkably briia'nt,
_
with red and black dominatig, ,Whjlst the "female usually
'
'
THE momo—v OF FIS—HES
,
_
possibility of-QOne sex Changigg-into another brings
.
,
_us to
of the meaning of secondary sexual
-
These are the outcome of seXuality ; - quite
-
apart
the special organe the males frequently have a
different appearance and dierent. structures from“ the
’
In other groups _of Vertebrates these di'er'ences
are usually of a constant character; the males are larger
__
'
”with distinctive ’markings, the females smaller and plainer ;
but in shés the range of variation is very
.
Among the marine Téleosts external sexual differences
'
are seldom apparent, the sexes of the Gadoids, Clupeids,
Scombroids, etc., are precisely alike; But among the—inshore
,
forms, particularly those that live among the seaweeds like—;—
'
‘
the Labro‘ids, the males show a mOre brilliant coloration than
'
the fetales during.the spawningseason. In the Dragonet
'
"
Calliahnus,the 'male is much the larger, with longer
:
S'nout and d0rSalnS, whilSt_ the body during the breedîng
°
season becomes ornamented with yellow and
-_
‘
the female remaining of a dull greyish—yellow. In an Indian
,
however, it is the female that is the more: 'brightly
Ïco_lou’red. In the Elasmobranchs.— the colour is ”net i"dis—Ï
tinëtive_of the sex, but the basal part of the ventràl or "pelvic
ï
ns in the males is used as aclasper to keep hold of thé.female
;
during pairing ; in the Chirhæras_ there—is a secondlclasper
'
'
infront of the ventral n and Still a thirdon the top
_
,
'
__head. During pairing the
his body around Ï_'and
Ï
“lengthWisC alog;the body ,_of
': f »
rest
gb ackofthe
The male
has no
-.
headclasper ,.
"
'
'
,It".is5amongstithef‘freshwaterîËTële'osts; hOWeÿer, that the
?
-seäùà1};characçersjaireiïmést
and" every
part of the male ;sh*from the mouth to the tail is affected,
'
.
naturally,
in different
'
Usu‘allÿ
that are longer in the male,sorhetirés,
‘
'
however,,the ventràls= or the d0rsal and even the Ïca'udal.
The COIOÎa‘CiOnOfÆhe male may be remarkably briia'nt,
_
with red and black dominatig, ,Whjlst the "female usually
'