Submersed weed management with triploid grass carp in waterlily production ponds.

摘要

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