In single variable tests, depth was a significant predictor of both FZT intensity
and prevalence of infection: an increase in 1 m of pond depth was
associated with 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 fish m−3, intensity
of infection was only 43% of that in ponds with stocking densities
b 100 fish m−3, and similarly the odds of infection was 46% (Table 2).