| eed control by triploid grass carp (Ctenopharyngodon idella Val.) in waterlily (Nymphaea cultivars) production ponds was investigated and simulated. The 4 x 2 factorial experiment involved eight duplicated treatments consisting of four levels of weed control and two waterlily cultivars. Treatments included a no-weeding control, manual weeding, 1 and 2 grass carp per 52.5-m;A systems model was developed to simulate the effect of grazing by grass carp on the dynamics of weed biomass in a shallow water body in south Texas. Fish growth was a function of assimilation and metabolism. The model was parameterized using available information from the literature and results of the field experiment. It predicted that a stocking density of 110... |
