Survival rate
The variables ‘season’, ‘C. carpio stocking weight’and
‘stocking density’were, next to‘wild ¢sh biomass’, included
in the survival rate multiple regression.Wild
¢sh bene¢t from the modi¢cations made to the rice
¢eld and the speci¢c rice^¢sh management (Rothuis
et al.1998c). In our experiments, the predator Channa
striata (Bloch) was the main wild ¢sh species. This
species is known to predate on C. carpio (Alikunhi
1966).While we tried to prevent entry of wild ¢sh in
our experimental ¢elds, we found wild ¢sh in nearly
all plots at harvest. Whereas Rothuis et al. (1998c)
postulated that these apparently have no adverse effect
on the yield of introduced ¢sh, the data presented in this paper (Table 6) and byVromant et al. (2002a)
for O. niloticus and by Vromant et al. (2002b) for B.
gonionotus seem to prove otherwise.
Survival rateThe variables ‘season’, ‘C. carpio stocking weight’and‘stocking density’were, next to‘wild ¢sh biomass’, includedin the survival rate multiple regression.Wild¢sh bene¢t from the modi¢cations made to the rice¢eld and the speci¢c rice^¢sh management (Rothuiset al.1998c). In our experiments, the predator Channastriata (Bloch) was the main wild ¢sh species. Thisspecies is known to predate on C. carpio (Alikunhi1966).While we tried to prevent entry of wild ¢sh inour experimental ¢elds, we found wild ¢sh in nearlyall plots at harvest. Whereas Rothuis et al. (1998c)postulated that these apparently have no adverse effecton the yield of introduced ¢sh, the data presented in this paper (Table 6) and byVromant et al. (2002a)for O. niloticus and by Vromant et al. (2002b) for B.gonionotus seem to prove otherwise.
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