The Data

USGS preyfish & perch numbers

Perch Sport Harvest - All States

Wis. GB perch SCAA - record number of 1 yr old perch in the presence of mussels

USFWS letter #1     letter #2 - Note: Trout are stocked despite invasive lampreys, while perch can't because of claimed harm by mussels. Yet Wis. whitefish numbers are way up with mussels present, see Egan's errors 2? chart 6.