TY - GEN
T1 - Lake trout spawning at Julian’s Reef, Lake Michigan. What, the shell?
AU - Janssen, John
AU - Stein, Jeffrey
AU - Carlson, Erik
N1 - Conference Proceedings
62nd Annual Conference on Great Lakes Research (IAGLR 2019); 10-14 June 2019, Brockport, New York
PY - 2019
Y1 - 2019
N2 - The best lake trout spawning reef in Lake Michigan is Julian’s Reef, about 20 km offshore of Illinois, with a summit of about 27 meters. Lake trout eggs were first reported for the site in 1995 via unmanned submersible (ROV) observations. Quagga mussels and round gobies were absent at that time. Currently about 50% of the lake trout spawners are naturally reproduced. Quagga mussels mostly encrust the rocks and there are areas of “bleached” shells presumably concentrated by hydrodynamic events. Via ROV-based suction sampling and electroshocking we found both eggs and alevins to be almost exclusively in bleached quagga shell beds. We also found egg predation by slimy sculpin, round gobies, lake whitefish, and burbot.
AB - The best lake trout spawning reef in Lake Michigan is Julian’s Reef, about 20 km offshore of Illinois, with a summit of about 27 meters. Lake trout eggs were first reported for the site in 1995 via unmanned submersible (ROV) observations. Quagga mussels and round gobies were absent at that time. Currently about 50% of the lake trout spawners are naturally reproduced. Quagga mussels mostly encrust the rocks and there are areas of “bleached” shells presumably concentrated by hydrodynamic events. Via ROV-based suction sampling and electroshocking we found both eggs and alevins to be almost exclusively in bleached quagga shell beds. We also found egg predation by slimy sculpin, round gobies, lake whitefish, and burbot.
KW - INHS
UR - http://iaglr.org/conference/proceedings/2019/prof61.html
M3 - Conference contribution
BT - Large Lakes Research: Connecting People & Ideas
ER -