POLYCULTURE OF AFRICAN CATFISH, (Clarias gariepinus) AND NILE TILAPÍA.(Oreochtomis niloticus) IN CONCRETE TANK.
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Date
2009-06-09
Journal Title
Journal ISSN
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Publisher
Abraham Adesanya Polytechnic Ijebu Igbo
Abstract
This study was conducted to assess the effect of
polyculture on tilapia {Oreochromis niloticus) growth and
to evaluate African Catfish (Clarias gariepinus) as a
predator control for unwanted tilapia offspring in a poly
culture system. Three treatments were tested using three
l00m2 concrete. tanks. Ponds were stocked with male
tilapia in treatment (T1), mixed sex tilapia in treatment {r2)
and mixed sex tilapia with catfish in treatment {TJ). This
treatment (T3) is stocked at the ratio 5: 1, while treatment
(T1) and (T2) is a control treatment. Fish were feds with a
commercial diet ration 1.5% of body weight per day. Feed
inputs is adjusted biweekly, were based on tilapia biomass.
Water quality parameters were estimated bi,veekly.
AT-test was used to compare the weight gain of tilapia and
net fish yield. Weight gain and net fish yield were
significantly higher in treatment (T1), while treatment (T3)
also have a high Weight Gain (WG) and Net Fish Yield
{NFY) than treàtment (T2) which have a very low weight gain WG and net fish yield NFY