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Title:	Triploid grass carp in Lake Marion, South Carolina
Authors:	Clemson University. Department of Aquaculture, Fisheries, and Wildlife. Aquatic Plant Control Research Program (U.S.) Kirk, James Philip, 1948- Killgore, K. Jack Morrow, James V. Foltz, Jeffrey W.
Keywords:	Collection techniques Grass carp Population attributes Hydrilla Aquatic plants Biological control Biocontrol Ecology Lake Marion South Carolina
Publisher:	Environmental Laboratory (U.S.) Engineer Research and Development Center (U.S.)
Description:	Miscellaneous Paper Abstract: A 5-year study of triploid grass carp movement and population attributes was conducted in the Santee-Cooper reservoir system. Radiotelemetry showed no long-distance migrations, and fish did not move into the river channel. Triploid grass carp remained on upper Lake Marion (target control area), exhibited local movements averaging 0.10 to 0.29 km/day, and preferred open flats with hydrilla. Fish apparently avoided or moved away from areas with low dissolved oxygen. Skilled bowfishermen were used to collect triploid grass carp for age and growth analysis. Utricular otoliths (lapilli) and scales were successfully used to age triploid grass carp. This population exhibited linear growth through age 6 at a rate of 3 kg/year with 80-percent survival. Extrapolation of population models showed densities of 5 fish per surface hectare of water or 17 fish per vegetated hectare as of 1994. The study concluded that grass carp can be efficiently collected in large reservoirs, suitable aging structures exist, and efficacy of stocking can be successfully monitored using telemetry, population-density estimates, and growth rates.
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/6281
Appears in Collections:	Miscellaneous Paper