168
Aquaculture of Cypnicis
was
kept as control and treated with distilled water. Fish in lot 1
never
spawned. A few ripe eggs were, however, obtained on stripping in lot
1. At the dose level
10 mg,/Kg, all the fish spawned profuse1y (120.000ïôvâKéë
8 hrs after the injection. The eggs produced showed satisfactory
tion (80—852)-and hatching success (70%); On July 22, 1984, 15 more
were
transferred into the experimental tanks and were divided again in
Lot
1
received 5 mg/Kg of the pimozide and lot 2 10 mg/Kg of it. Lot
kept as control and treated with acidified saline. Fish in lot 1
not
ovulate. At
the dose
10 mg/Kg, however, all the fish ovulated and
»
produced ripe eggs as indicated by the fertilization (SO—55%) and
success
(40%).
'
MATURATÏONAL
TEMPERATURE EFFECTS
ON STEROID HORMONE
OF THE CARE Cyprinus carpio.'Û.E. KIME, and N.J. MÀNNÏNG, ÛQpŒÆIMQHÉ‘O“
Zoo£ogy, TheUMve/MÇtÿ, Sñeéæ'eÆd, UNITED KINGDOM.
Temperature is the main environmental stimulus to reproductive
in carp, but its effect on the testicular hormone balance during reprodu+…1
ctive development is unknown. Carp testes converted testosterone into
.…x
testostérone glùcuronide, 11—keto and 118 —hydroxytestosterone in higher
yields at 32 than at 20°C. In one—year old male carp taken from
ponds at 10—159C in May (non—spermiating) and held for four weeks at
24 and 29°C there were no significant differences in gonadosomatic index
(GSI) or free plasma androgen levels but test05terone glucuronide
increaSed significantly With temperature; In fish which had been held
four weeks et 25°C in July (spermiating), GSI; testosterone,
sterone
and testosterone_glucuronide were all significantly higher
a
further tWO weeks at 30°C than at
was
the
predominant hormone:in fiSh
and Was
significantly higher
in fish lower CSI; The results indicate that the effect of temperature
goadal development is dependent upOn the stage
spring temperatures between 20Wet
have little
in summer after
warm Water,
'a Short period of eXp0sure to warmer
“OF”vLH—;RH AND ITS
J
T
and= KM…
«… hwcvs
( 1 — 805
Thedosesof LH—RH 150?
91
g/
and “of-3
11 g/Kg
with’
The” - _,
relative average
of
880 éggs per Kg
Kg
(Α
,
Cfarp% hYP°P_h‘Y$i$
«Egg £ertilization
-
and 'ProgenY
ro OOCYTE FINAL MATHRATION AND OVULATION IN THE
,
The
-
is“ ‘a‘
most
Aquaculture of Cypnicis
was
kept as control and treated with distilled water. Fish in lot 1
never
spawned. A few ripe eggs were, however, obtained on stripping in lot
1. At the dose level
10 mg,/Kg, all the fish spawned profuse1y (120.000ïôvâKéë
8 hrs after the injection. The eggs produced showed satisfactory
tion (80—852)-and hatching success (70%); On July 22, 1984, 15 more
were
transferred into the experimental tanks and were divided again in
Lot
1
received 5 mg/Kg of the pimozide and lot 2 10 mg/Kg of it. Lot
kept as control and treated with acidified saline. Fish in lot 1
not
ovulate. At
the dose
10 mg/Kg, however, all the fish ovulated and
»
produced ripe eggs as indicated by the fertilization (SO—55%) and
success
(40%).
'
MATURATÏONAL
TEMPERATURE EFFECTS
ON STEROID HORMONE
OF THE CARE Cyprinus carpio.'Û.E. KIME, and N.J. MÀNNÏNG, ÛQpŒÆIMQHÉ‘O“
Zoo£ogy, TheUMve/MÇtÿ, Sñeéæ'eÆd, UNITED KINGDOM.
Temperature is the main environmental stimulus to reproductive
in carp, but its effect on the testicular hormone balance during reprodu+…1
ctive development is unknown. Carp testes converted testosterone into
.…x
testostérone glùcuronide, 11—keto and 118 —hydroxytestosterone in higher
yields at 32 than at 20°C. In one—year old male carp taken from
ponds at 10—159C in May (non—spermiating) and held for four weeks at
24 and 29°C there were no significant differences in gonadosomatic index
(GSI) or free plasma androgen levels but test05terone glucuronide
increaSed significantly With temperature; In fish which had been held
four weeks et 25°C in July (spermiating), GSI; testosterone,
sterone
and testosterone_glucuronide were all significantly higher
a
further tWO weeks at 30°C than at
was
the
predominant hormone:in fiSh
and Was
significantly higher
in fish lower CSI; The results indicate that the effect of temperature
goadal development is dependent upOn the stage
spring temperatures between 20Wet
have little
in summer after
warm Water,
'a Short period of eXp0sure to warmer
“OF”vLH—;RH AND ITS
J
T
and= KM…
«… hwcvs
( 1 — 805
Thedosesof LH—RH 150?
91
g/
and “of-3
11 g/Kg
with’
The” - _,
relative average
of
880 éggs per Kg
Kg
(Α
,
Cfarp% hYP°P_h‘Y$i$
«Egg £ertilization
-
and 'ProgenY
ro OOCYTE FINAL MATHRATION AND OVULATION IN THE
,
The
-
is“ ‘a‘
most