Weights of individual fish examined ranged from 1.00 to 7.34 g and
mean weight of fish by pond ranged from 1.60 to 3.70 g (Table 2). Prevalence
of infection by FZT ranged from 0 to 48% in the 60 ponds. The
dominating trematode species was H. pumilio (N95%) and a few
other species of the Heterophyidae (Haplorchis taichui, Centrocestus
formosanus, Stellantchasmus falcatus and Procerovum sp.) were found;
none of the fish were found infected with O. viverrini. The mean intensity
of infection by pond ranged from 0.00 to 4.02 metacercariae/fish
examined, and amaximumintensity of 28metacercariae was recovered
fromone fish. The association of various pond factorswith intensity and
prevalence of infection in the juvenile fish is summarized in Table 2. In
single variable tests, depthwas a significant predictor of both FZT intensity
and prevalence of infection: an increase in 1 m of pond depth was
associatedwith 3.01-fold increase in FZT intensity and the odds ratio associated
with a 1 m increase in pond depth was 2.19 (Table 2; Fig. 1).
Both intensity and prevalence of infection declined as fish stocking density
increased. If stocking density was greater than 200 fishm−3, intensity
of infection was only 43% of that in ponds with stocking densities
b100 fish m−3, and similarly the odds of infection was 46% (Table 2).
Weights of individual fish examined ranged from 1.00 to 7.34 g andmean weight of fish by pond ranged from 1.60 to 3.70 g (Table 2). Prevalenceof infection by FZT ranged from 0 to 48% in the 60 ponds. Thedominating trematode species was H. pumilio (N95%) and a fewother species of the Heterophyidae (Haplorchis taichui, Centrocestusformosanus, Stellantchasmus falcatus and Procerovum sp.) were found;none of the fish were found infected with O. viverrini. The mean intensityof infection by pond ranged from 0.00 to 4.02 metacercariae/fishexamined, and amaximumintensity of 28metacercariae was recoveredfromone fish. The association of various pond factorswith intensity andprevalence of infection in the juvenile fish is summarized in Table 2. Insingle variable tests, depthwas a significant predictor of both FZT intensityand prevalence of infection: an increase in 1 m of pond depth wasassociatedwith 3.01-fold increase in FZT intensity and the odds ratio associatedwith a 1 m increase in pond depth was 2.19 (Table 2; Fig. 1).Both intensity and prevalence of infection declined as fish stocking densityincreased. If stocking density was greater than 200 fishm−3, intensityof infection was only 43% of that in ponds with stocking densitiesb100 fish m−3, and similarly the odds of infection was 46% (Table 2).
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