R. Billard et J. Marcel, Ed. Aquaculture of Cyprinids, INRA, Paris, 1986.
Posäer summanes
,
,
CANNIBALISM IN REARED KOI—CARP LARVAE. S. APPELBAUM, P. ANDERSON and C.
MOCHENDORF, FÂÀh Labouætohy Jacob B£auAi@én IWSMuÆQ 50/z ÛQAQJZÂÎ Rezs wah,
Bcn—Gu/uon UMvc/uäy othc Ncgcv, Sade—809211 Campa/5, 84990 ISRAEL.
Koi—carp larvae (Cyprinus carpio L.) reared in aquaria at densities of
approximately 30/L at the start, show a high rate of cannibalism. Sibling
cannibalism commences when Koi—carp larvae reach a length of approximately
14—16 mm.
In all experimental groups, cannibalism rate increases within the
first two weeks of the experiment, followed by a sharp decline reaching zero
level
towards
the end of the experiment (37 days). This can be explained by :
smaller larvae and young fish are left in the tank to serve as prey.
2) the allometric growth of the month reduces the capability 0f‘predation on
smaller prey. One important conclusion is that nursing Koi—carp larvae in
hatcheries before release into outdoor ponds can suffer severe losses up to
50% and more.
,
ARTIFICIAL FEEDING OF CARP
(Cvprinus
N.
CHARLÔN, H. ÜURÀNTË,
À.M. ESCÀFFRE, and P. BERGOT. ÏNRA, UnLtë d'ë@cvagc £aäva£äc, B.P. 3 SŒÂHI
64370 Abcώn, FRANCE.
A batch of
12 000
larvae of carp (Cyprinus carpio L…) issued from a single
pair of sires, was reared for 43 days exclusively on artificial food (21
days on a diet of mainly liver and yeast, and then commercial trout starter—
feed during the
After 24 days of rearing in a tank of
«300 l, survival was 87%. After 19 additional days of rearing in a tank of
1
500 l, survival was 71% and«mean weight 1.16g. The daily Specific growth
rate decreased from 23 to
the experiment, Total food conversion
ratio was 0.62 (6.08 Kg of food was distributed for a final total weight,
of
9.88 Kg of fish). The results presented here indicate that it is possible
to
rear
carp
larvae without zooplankton, Exact determination of the total
weight of the fish and precise adjustment of the quantities of food to be
delivered during rearing should allow further improvements in survival and
growth,
,
-
,
'
x
‘
FOOD UPTAKE MECHANISM OF LARVAL CARP. M. R. DQOST amd J.G…M. ":d' BOOGAART
,
Demi. 05 Expe/vLm2mtæ A…aÆMŒphaogy and;Ceî
Univ@wiiy, M…j‘hdæg 40, 6709 PG Wagcmngcn, THE NETHERLANDS.
'In aquaculture, the first feeding of fish larvae is often difficult, Feeding
(successful snaps/total:snaps) increases rapidly during growth… An»
lunguccegsful snap
can
result from bad aiming or from escape movements of the
prey. We here describe the feeding sequence of larval carp and the contr1bur
tion to success of aiming and eScapte movements of the prey and Estimate the
energetic costs of snapping. Feeding in larval fish is extremely rapid : in
first feeding carp larvae, the prey enters the mouth Within
4—6 ms after the
start of mouth opening. High speed movies (400—1200 fps) Wlth Simultaneous
views from below and aside have been made Of CârP larvae (SL 6—8 mm) ÎÊEdIHË
on
brine shrimp nauplii. The used magnificatiom(alloSt
ÎU11 scale on the
negative) allows detailed analysis. When searching for prey, larvae sw1m
Posäer summanes
,
,
CANNIBALISM IN REARED KOI—CARP LARVAE. S. APPELBAUM, P. ANDERSON and C.
MOCHENDORF, FÂÀh Labouætohy Jacob B£auAi@én IWSMuÆQ 50/z ÛQAQJZÂÎ Rezs wah,
Bcn—Gu/uon UMvc/uäy othc Ncgcv, Sade—809211 Campa/5, 84990 ISRAEL.
Koi—carp larvae (Cyprinus carpio L.) reared in aquaria at densities of
approximately 30/L at the start, show a high rate of cannibalism. Sibling
cannibalism commences when Koi—carp larvae reach a length of approximately
14—16 mm.
In all experimental groups, cannibalism rate increases within the
first two weeks of the experiment, followed by a sharp decline reaching zero
level
towards
the end of the experiment (37 days). This can be explained by :
smaller larvae and young fish are left in the tank to serve as prey.
2) the allometric growth of the month reduces the capability 0f‘predation on
smaller prey. One important conclusion is that nursing Koi—carp larvae in
hatcheries before release into outdoor ponds can suffer severe losses up to
50% and more.
,
ARTIFICIAL FEEDING OF CARP
(Cvprinus
N.
CHARLÔN, H. ÜURÀNTË,
À.M. ESCÀFFRE, and P. BERGOT. ÏNRA, UnLtë d'ë@cvagc £aäva£äc, B.P. 3 SŒÂHI
64370 Abcώn, FRANCE.
A batch of
12 000
larvae of carp (Cyprinus carpio L…) issued from a single
pair of sires, was reared for 43 days exclusively on artificial food (21
days on a diet of mainly liver and yeast, and then commercial trout starter—
feed during the
After 24 days of rearing in a tank of
«300 l, survival was 87%. After 19 additional days of rearing in a tank of
1
500 l, survival was 71% and«mean weight 1.16g. The daily Specific growth
rate decreased from 23 to
the experiment, Total food conversion
ratio was 0.62 (6.08 Kg of food was distributed for a final total weight,
of
9.88 Kg of fish). The results presented here indicate that it is possible
to
rear
carp
larvae without zooplankton, Exact determination of the total
weight of the fish and precise adjustment of the quantities of food to be
delivered during rearing should allow further improvements in survival and
growth,
,
-
,
'
x
‘
FOOD UPTAKE MECHANISM OF LARVAL CARP. M. R. DQOST amd J.G…M. ":d' BOOGAART
,
Demi. 05 Expe/vLm2mtæ A…aÆMŒphaogy and;Ceî
Univ@wiiy, M…j‘hdæg 40, 6709 PG Wagcmngcn, THE NETHERLANDS.
'In aquaculture, the first feeding of fish larvae is often difficult, Feeding
(successful snaps/total:snaps) increases rapidly during growth… An»
lunguccegsful snap
can
result from bad aiming or from escape movements of the
prey. We here describe the feeding sequence of larval carp and the contr1bur
tion to success of aiming and eScapte movements of the prey and Estimate the
energetic costs of snapping. Feeding in larval fish is extremely rapid : in
first feeding carp larvae, the prey enters the mouth Within
4—6 ms after the
start of mouth opening. High speed movies (400—1200 fps) Wlth Simultaneous
views from below and aside have been made Of CârP larvae (SL 6—8 mm) ÎÊEdIHË
on
brine shrimp nauplii. The used magnificatiom(alloSt
ÎU11 scale on the
negative) allows detailed analysis. When searching for prey, larvae sw1m