Potential competition between hybrid striped bass (Morone saxatilis x M. americana) and striped bass
Potential competition between hybrid striped bass (Morone saxatilis x M. americana) and striped bass (M. saxatilis) in the Cape Fear River Estuary, North Carolina
PATRICK Wesley S. (1) ; MOSER Mary L. (2) ;
(1) Center for Marine Science, University of North Carolina-Wilmington, 1 Marvin K. Moss Lane, Wilmington, North Carolina 28409, ETATS-UNIS
(2) Northwest Fisheries Science Center, National Marine Fisheries Service, 2725 Montlake Boulevard East, Seattle, Washington 98112, ETATS-UNIS
Gillnet surveys from 1990 to 1992 and from 1996 to 1999 indicated a two-fold decrease in native striped bass (Morone saxatilis) populations and a concomitant two-fold increase in hybrid striped bass (Morone saxatilis x M. americana) in the Cape Fear River estuary, North Carolina. Gut content analysis indicated high diet overlap, and tag-recapture data suggested that hybrid striped bass participate in spawning migrations. These data provide circumstantial evidence that hybrid striped bass compete with striped bass for food and that they may compete for mates or habitat on the spawning grounds. Increasing abundance of adult hybrid striped bass in this system elevates the likelihood of hybrid introgression. We recommend that stocking of hybrid striped bass be terminated to preserve native striped bass populations.
Estuaries ISSN 0160-8347
2001, vol. 24, no3, pp. 425-429 (19 ref.)