Crews from the U.S> Fish and Wildlife Service caught a real life river monster last week in Detroit. The sturgeon weighed in at 240 lbs, and according to reports, they believe it's over 100 years old. They say based on the girth and size, they believe this female sturgeon has been roaming the Detroit river for over 100 years. The typical lifespan for males are 55 years and for females, anywhere from 70 to 100 years. Lake sturgeon are listed as a threatened species and you 8are only allowed to catch one per year, but only if it's a certain size and caught in a few state waters. All sturgeons caught in the Detroit River are required to be released ,much like this one who was released immediately.