Seasonal benthic prey fish densities in Lake Huron, offshore of Hammond Bay and Alpena, Michigan (2012)
Dates
Data was finialized
2013
Start Date
2012-04-25
End Date
2012-09-15
Summary
Up to 12 different prey fish species were sampled with a 12-m bottom trawl during April, July, and September along two Lake Huron transects (Thunder Bay, Hammond Bay). At each transect in each month, two replicate 10-min tows were conducted at each of three depths (18, 46, 82 m) during the day and night. Once the fish were onboard in a given tow, they were sorted to species, weighed (in aggregate), and up to 50 individuals per species were measured to the nearest total length.
Summary
Up to 12 different prey fish species were sampled with a 12-m bottom trawl during April, July, and September along two Lake Huron transects (Thunder Bay, Hammond Bay). At each transect in each month, two replicate 10-min tows were conducted at each of three depths (18, 46, 82 m) during the day and night. Once the fish were onboard in a given tow, they were sorted to species, weighed (in aggregate), and up to 50 individuals per species were measured to the nearest total length.
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Material Request Instructions
Data was collected during field visits. Data is double checked for entry errors. Dreissenid mussels are weighed but not measured. Any rocks or rotting or dead fish are excluded from entry. We have several published papers that describe the process and methodology used. One example: Bunnell, D. B., C. P. Madenjian, and R. M. Claramunt. 2006. Long-term changes of the Lake Michigan fish community following the reduction of exotic alewife (Alosa pseudoharengus). Canadian Journal of Fisheries and Aquatic Sciences 63: 2434-2446. Only processing occured when catches were sub-sampled and we calculated a direct extrapolation. Data were finalized in database sometime in fall of 2013.
Purpose
These data are part of a larger study that seeks to determine whether invasive quagga mussels are limiting biomass and productivity of plankton and fish in offshore waters.
