Gâld$h (Carassñuswauyaus L.) farming in Italy
"371
100,000 fish per
(more than
EXTENSIVE FARMING
‘
’
‘
*
-
ponds, usually abandoned rice fields
courSes, have dimensions ranging fr0m a few thousand m2
a
tér depth of no more than 1 metre. Production in
siVe and relies exclusively upon the natural productivity of the enviromeñ£
since by—products from corn milling and Waste from
whith“àëe
often fed, do not satisfy the needs of the shoals of young
Ÿexchge, which is often absent,
3=4"175è67hà; The
breeding technique is based on autumnal;
release
of“Some 40-100 kg of 2—3 years old breeders pèf
In Sëptember partial bât—
chéS are made by attraCting the fish into large nets
food.
ly, COmplete drying out of the ponds finishes the
spring,
days before the release of the new
Thé
duction is extremely variable and ranges from 50 to
INTENSIVË FARMING
_
—
Nowadays intensive breeding is carried out using techniques
those of carp farming. Spawning ponds With surface areas ranging from
500"m2, “a “maximum depth of 60—80 cm, a single level
bÿ”a peripheral ditch sown with gfàminacè0us
are
days before Spawning. When the water
are“ rél‘èäsëd after
green or salt in
numbers
%Hëîf
from a miñ;
mum of
to
a
maximum of 1
sex
ratio
is l:l or l+21ürfavour
of the males….During the…night, immediately
water
level,,
is lQWered until the central part of the
unçovered—thus
fish to move into the beripheraL-ditch
easily cag
Ônce thé
has bèèn rèè£ôfè to its
spawn hatehes
within 3 to 6 days. This methodlms,the
contact between
and
transmission of
Pathogens, and the
?
'
breeding
°f. tË“?
be uSéd
an alternative
mêmti0ned
thod: After Stripping and
the eggs
are ineubatéd
After the yolk sac has been resOrbed the larVae can
be released directly
to“ èiha11 p‘0‘nds“
‘havé" "b‘eè'n
With»
{(ÎNÊ
1
metal
are'USQÊ3 after
Of
natural plankton collected in the ponds, they pass t°
Ciàlee l feed
n
are transferred
to the first‘
breeding pohdsü‘The spawning ponds can
used for the first
range
from 200 to
plankton production; for Which a suitable
W1thp-llme - £f400?
500
If cowmanure15usedÔtons/haarf—°—dlStrlbmï@d1nfour equal