Due to their nature, Lake Michigan is a freshwater lake, so dolphins cannot survive here. The marine mammal, called the harbor seals, are only found in the Great Lakes, particularly in Lake Michigan, Lake Huron, and Lake Superior.
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Little known to most New Yorkers is the fact that freshwater dolphins once thrived in waters of Lake Erie. The cool waters kept the size of these dolphins uniquely small compared to their ocean swimming cousins - evidence suggest adults rarely reached 24 inches in length.
The Lake Sturgeon - Michigan's Biggest Creature You may be a little startled if it decides to swim past your feet, as the Lake Sturgeon is rather big in size. On average, they can be anywhere between six and three feet in length. They will also weigh anywhere between 30-100lbs.
A few even submitted the issue to Snopes.com, debunkers of urban legends, which investigated the issue last summer and pronounced that stories of whales in Lake Michigan are the result of “mistakes, pranks and hoaxes.”
In Lake Michigan, Chinook salmon are a dominant and generally mid-water predator whose diet consists mostly of alewives, a generally mid-water prey fish.