Abstract
ABSTRACT We evaluated the ability of low-density triploid grass carp (Ctenopharyngodon idella) stockings to provide partial control of submersed vegetation (maintain 10–40% coverage) in four small impoundments. Triploid grass carp were stocked during May 1991 at densities ranging from 4.0 to 7.5 per surface ha; additional triploid grass carp (5.0 per surface ha) were added to one impoundment during June 1992. Submersed vegetation was monitored initially and during July 1991–1994. Grass carp stockings of 4.0 per surface ha failed to provide the desired submersed vegetation control through 1994. A stocking of 7.5 triploid grass carp per surface ha eliminated all submersed vegetation [southern naiad (Najas guadalupensis)] from one impoundment. A significant reduction in southern naiad and coontail (Ceratophyllum demersum) was apparent in 1993 following the supplemental stocking of triploid grass carp. However submersed vegetation coverage and biomass appeared to be increasing in 1994. Because elimination and...
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