A mark-recapture population estimate for invasive silver carp (<Emphasis Type="Italic">Hypophthalmichthys molitrix</Emphasis>) in the La Grange Reach,Illinois River |
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Authors: | Greg G Sass Thad R Cook Kevin S Irons Michael A McClelland Nerissa N Michaels T Matthew O’Hara Matthew R Stroub |
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Institution: | (1) Illinois River Biological Station, Illinois Natural History Survey, Institute of Natural Resource Sustainability, University of Illinois at Urbana-Champaign, 704 North Schrader Avenue, Havana, IL 62644, USA |
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Abstract: | Invasive silver carp (Hypophthalmichthys molitrix) populations have expanded greatly in the Upper Mississippi River System (UMRS) since their introduction in the early 1970s.
We conducted a Chapman-modified, continuous Schnabel mark-recapture population and biomass estimate for silver carp (106–901 mm)
in the La Grange reach, Illinois River during 2007–2008. We estimated a total of 328,192 (95% CI 231,226–484,474) silver carp
(2,544 per river km 1,792–3,756) comprising 705 (95% CI; 496–1,040) metric tons of biomass (5.5 metric tons per river km 3.8–8.1).
Long Term Resource Monitoring Program (LTRMP) data from the La Grange reach showed an exponential increase in silver carp
catches since 1998, with an intrinsic rate of increase approaching 84%. In 2008, silver carp comprised about 51% of the total
LTRMP annual fish collection. To our knowledge, this large river reach may contain the greatest ambient densities of wild
silver carp in the world. Our findings provide a target for reduction efforts and also emphasize the importance of the La
Grange reach as a source population for potential expansion of the species to the Laurentian Great Lakes. |
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