116
_,
_…____
…
L Horyath.
_
property, as seen
the fact that the egg does not swell any more.
tempe—
rature regime imposed on the females after the second
hormone inj
ls
important foi“ successful 0Vulation (Tabl. 3). Temperatures
of
22—24°C give
a
better percentage of ovulation and amounts of stripped eggs than higher
(26—28°C) or lower (19—20°C) temperatures.
_
320
._
_
…
,
45 300
Fig. 4. Heat quantity
% 2’
'
‘
sary for ovulation at
-—
80
rent
temperatures and after
Α""'—
//
hormone injection. Stri‘pping
8. 260
in double hatched area Yields
‘
m
'—$:z‘,‘ê£:z£"äïê‘îzzäïê“f
better e
fertilisation.
à
240
gg
"
°
'
w‘
220
_
.
-
g‘ 200
"
"°
18
19
20
21
22 23
24
25
26
water température °C
“
Ï Ÿ
To” facilitate the prediction ofjthe
stripping time under normal
farming conditions, a program has been worked out (Fig. 4) which shows how
many hours
it takes, at a given water temperatures,
an
egg to be
after the second pituitary treatment (Horvath, 197815) .
__
_
Bardach J.
,
Ryther J.
,
Mc Larnex W.,
1972. Aquaculture. The farming and hus_
of
marine organisms. Willey, Interscience, New
‘
.Yorkӈ
11—18684‘ ,
‘
52
"
.
…
‘
'
BnK
Ep1e'r‘ {P 1976P1…… … n the
‘
_r_1
…. studies …
in,ççnsp
c‘afp}io>“.
3,
Billard
:
_Marcel
J:
1980.
Stimlati‘on
spermat10n
on
“ovulation in pike Esox lucius. Aquaculture, 21, 181—195.
.
.::;
Brunnhübner P., 1968. Das
de *Êîéfè‘täèke‘s bei
.
.Der,EiSçhWirt -3,_ 1:4. …
,
.
H°mthLl978a
m
propagat10nofthe common è‘a£p. ‘
_.
=
the SPaWig
(SzarVas) .…
b_eÎ-WCGJÇI ovulation
by… fèrmed
‘°YP‘fllâSÀ®&cultuï Hungarlca(SzarvaS)168—65
:
.
_
Îi Î7‘°rtS Es RentAdvanes
Aqùàèùlu‘çüre Vol '
n, Crm
L.) dring
SZSZSZRâlll—114
,
1957
voszproizvoditelnoj
karpov, 'obitäjusih
_
.v
…VNlORH.
.…1—64
_
…
.
.
1