A
Group of the exotic crayfish, Procambarus clarkii (total length
ranging from 4 to 6.1 cm) was held with the early stages of fry
of common carp, Cyprinus carpio Linnaeus, 1758 ; silver carp,
Hypophthalmichthys molitrix (Valenciennes, 1844) ; Nile tilapia,
Ore'ochromis nihticus (Linnaeus, 1757) ; and Sartherodon galilaeus
(Artedi,1757), with initial average lengtii ranging from 2 to 2.5 cm
and fingerlings with initial average length rangmg from 4.1 to 5.8 cm
. Each species were held separetely with the crayfish 5 aiming to find
out its effect on both survival and growth rates of the above fin fish in
polyculture.