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Status of pelagic prey fishes and pelagic macroinvertebrates in Lake Michigan, 2008

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David M. Warner, Randall M. Claramunt, Jeffrey D. Holuszko, and Timothy J. Desorcie, 2009, Status of pelagic prey fishes and pelagic macroinvertebrates in Lake Michigan, 2008: Great Lakes Fishery Commission.

Summary

Acoustic surveys were conducted in late summer/early fall during the years 1992-1996 and 2001-2008 to estimate pelagic prey fish biomass in Lake Michigan. Midwater trawling during the surveys provided a measure of species and size composition of the fish community for use in scaling acoustic data and providing species-specific abundance estimates. In 2005, we began sampling Mysis diluviana during the survey. The 2008 survey provided data from 24 acoustic transects (734 km), 33 midwater tows, and 39 mysid tows. Mean total prey fish biomass was 15.3 kg/ha (relative standard error, RSE = 7.6%) or ~82 kilotonnes (kt, 1,000 metric tons), which was 1.9 times higher than the estimate for 2007 but 78% lower than the long-term mean. The increase [...]

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Type Scheme Key
local-index unknown 70162071
local-pk unknown 70162071

Citation Extension

conferenceGreat Lakes Fishery Commission: Lake Michigan Committee Meeting
languageEnglish
citationTypeConference Paper

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