Assessment of Remnant Lake Sturgeon Populations in the Green Bay Basin, 2002-2003 Report to the Great Lakes Fishery Trust Project Number 2001.113 Principal Investigators: Robert Elliott and Brian Gunderman 920-866-1762 (voice) U.S. Fish and Wildlife Service 920-866-1710 (fax) 2661 Scott Tower Drive
[email protected] (email) New Franken, WI 54229
[email protected] (email) Rod Lange and Terry Lychwick (retired) 920-448-5127 (voice) Wisconsin Department of Natural Resources 920-448-5129 (fax) P.O. Box 10448
[email protected] (email) Green Bay, WI 54307-0448
[email protected] (email) Tom Meronek and Greg Kornely 715-582-5052 (voice) Wisconsin Department of Natural Resources 715-582-5005 (fax) P.O. Box 208
[email protected] (email) Peshtigo, WI 54157
[email protected] (email) Report prepared by Brian Gunderman and Robert Elliott 2004 Abstract Habitat loss and overharvest during the late 1800s dramatically reduced lake sturgeon populations in Lake Michigan. There is currently widespread interest in rehabilitating sturgeon populations, but information regarding the abundance, distribution, and population dynamics of remaining populations is required for restoration efforts to be successful. The objectives of this study were to (1) estimate the abundance of adult lake sturgeon during the spawning run in four Green Bay tributaries, (2) describe and quantify reproductive success in these rivers, (3) describe spawner habitat availability and use in these systems, (4) determine the distribution and contribution of discrete spawning stocks to the mixed population of sturgeon inhabiting Green Bay, and (5) estimate the overall population size of lake sturgeon residing in Green Bay.