Population response of triploid grass carp to declining levels of hydrilla in the Santee Cooper Reservoirs, South Carolina

Kirk, James P. and Morrow, James V. and Killgore, K. Jack and Kozlowski, Steven J. De and Preacher, James W. (2000) Population response of triploid grass carp to declining levels of hydrilla in the Santee Cooper Reservoirs, South Carolina. Journal of Aquatic Plant Management, 38, pp. 14-17.

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Abstract

Approximately 768,500 triploid grass carp ( Ctenopharyngodon idella Valenciennes) were stocked into the Santee Cooper reservoirs, South Carolina between 1989 and 1996 to control hydrilla ( Hydrilla verticillata (L.f.) Royle). Hydrilla coverage was reduced from a high of 17,272 ha during 1994 to a few ha by 1998. During 1997, 1998 and 1999, at least 98 triploid grass carp were collected yearly for population monitoring. Estimates of age, growth, and mortality, as well as population models, were used in the study to monitor triploid grass carp and predict population trends. Condition declined from that measured during a previous study in 1994. The annual mortality rate was estimated at 28% in 1997, 32% in 1998 and 39% in 1999; however, only the 1999 mortality rate was significantly different. Few (2 out of 98) of the triploid grass carp collected during 1999 were older than age 9. We expect increased mortality due to an aging population and sparse hydrilla coverage. During 1999, we estimated about 63,000 triploid grass carp system wide and project less than 3,000 fish by 2004, assuming no future stocking. management, population size Ctenopharyngodon idella, Hydrilla

Item Type: Article
Title: Population response of triploid grass carp to declining levels of hydrilla in the Santee Cooper Reservoirs, South Carolina
Personal Creator/Author:
CreatorsEmail
Kirk, James P.
Morrow, James V.
Killgore, K. Jack
Kozlowski, Steven J. De
Preacher, James W.
Refereed: Yes
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 38
Page Range: pp. 14-17
Date: 2000
Issuing Agency: Aquatic Plant Management Society, Inc.
Uncontrolled Keywords: Aquatic plants, growth, mortality, aquatic plant management, population size Ctenopharyngodon idella, Hydrilla verticillata; triploid carp
Subjects: Management
Biology
Limnology
Item ID: 1808
Depositing User: Stephanie Haas
Date Deposited: 11 Jan 2009 21:13
Last Modified: 29 Sep 2011 20:01
URI: http://aquaticcommons.org/id/eprint/1808

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