R. Billard et J. Marcel, Ed. Aquaculture ofCyprinids, INRA,
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K.OPUSZYNSKI
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inlàhd Fisheries Institute, Zabieniêc n‘ear Warsaw,
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05—500 Piaseczno, Poland
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Additional fish =s;>ecies- ane raised En carp :=ponds «to gain the
higher incomefrom the unit area..- ît can be achieved through an
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increase… of; totai yield
”in ;Common'f‘cerp production
or
even
when corp production is
case additional
shouldæposs‘eSshigher than ,çarp
value
and/or
their*— productio‘nvsho'uîd be more cost—effective. Polyculxre technique—"
makes
possible better: utilization of natural food
Saving
artificial food or using food that is leSs expensive. Polycu—Iîure
can i
improve pond environmental conditions, first of all feeding conditions
forpondS and control -of…äquetîc “weeds.
Acc:o‘mpanying fish :in .ro.enp 'onnd-s<:are…raised as
fish or'
mateüal‘"for open —»
bodies. The sh under consideration
belong
‘Centrarchidäe,
Czi'chlidee,
Mugid'e,f ?Pe'rcidae; Saknonidae‘, Silüridae‘, They
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'c2a‘n9—ibe‘ dîvided
…anc‘i -epiphytic“fauma . feeders,
zoop1ankton
rde'tritus feederS
herbivoroüs
sku
in different parts of. the World depends“.
fish species aVai‘lable—‘end
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v
'=:
les étangs &
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carpes,
espèces sont…éleVées pour
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augmenter le rendement avec ou sans diminution de la…-pnoduction
carpe… Les …espéces ajoutées doivent avoir une
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“de s,
faiblesLa
’f’î
permet ùhè
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La
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