%ïfAquaæ'W/äufeäofèäè
365
Fonds
for tench production are
manured and
1n
carp pond culture. Only weed control may be restricted to leave some
a—reasfor the
thoughth15rai sesseme difficulties 1? n
;
emptyi 09 '- F i Shi 09 in
tobe carried outaccordmgto t
.
In the third year,“ t‘ench, like ‘cà%pcanbesteadyfedmth suppiem:eataw
foods such as rye, barley and lupin.
‘
”
‘
"
',
In the second
about; 60 9
e
le») ,
_
With
«
one
1 -year carp , ( Scha__epercl
where,
grow…to tablesne(
With
2Weæêï?
maybe
Zhe
be;
the more the pond
The various,age
tench males and female$ should also be
unintentional reproduction. In this case, the different growth potentials
of the sexes have to be taken into account for proper stocking density.
To keep down the massive development of tench try, a number of
stock pike fihgerlings with 3—year tench, if the males and
not separated.
99H”
be
expected For tench as &
to
““
more
than 200 kg/ha.
””
.
In
carp are stocked together to counterbalance the
more
vigorous carp; this principle is applicable at all age levels
ÿ“f
n
…n
—
::
meansurv1val …
n
g
î‘
Q ‘n…s
{…
!'kg
gr…:f
,
kg/hà
Tench
80 000
2.0
47700
_
”
5916“
“
"
“"3‘25‘ ‘.
Total
130000
‘
79
087
Table 4
Production of 2-year tench in
advanced
5
…