Last week, an excellent article in the Milwaukee Journal Sentinel covered some great news – lake whitefish are migrating inland to spawn and, in many cases, fish were running up into tributaries where they hadn’t been seen for 100 years.
One of the scientists featured in that article is Solomon David, a post doctoral researcher working jointly with Chicago’s Shedd Aquarium and the Center for Limnology’s Pete McIntyre on Great Lakes migratory fish. We asked Solomon a few questions about the migration and what the expanding ranges mean about the state of Wisconsin rivers.
Most people think of fish migrations as springtime phenomena – why winter? Is there an ecological advantage to end-of-year migrations?
Solomon David (SD): Many people think of spring migrations for fish like Northern pike and suckers, which are other focal migratory groups in our research in the McIntyre Lab. But Chinook salmon spawn in the fall, and lake whitefish spawn a bit later in the fall and early winter. There are advantages to spawning when it’s cold… Continue reading