Does the monster in lake champign exist?

Lake Champlain's monster is nicknamed "Champ," and has been sighted over 240 times,there have been numerous photos and videos some of which are questionable as to their authenticity...There have been numerous eyewhitness reports as to the same, many of which are also questionable.
There is no scientific proof of the exsistence or the non-exsistence of such a monster in lake champlain..
One explaination given is: that the sighting were of Sturgeons,Lake Sturgeons are a large species of fish that inhabit Lake Champlain with mature individuals averaging three to five feet in length but can reach sizes of 8 feet, weigh over 300 pounds and live for over a century..however the White sturgeon is the largest freshwater fish in North America and does inhabit the great lakes,other lakes and rivers in the US... The largest on record weighed 1500 pounds and was over 18 feet in length.the white sturgeon was very common but now it is very rare and is on the U.S. Endangered Species list.
Sturgeons with their smooth skin, bone plates along their sides and their broad head are commonly called dinosaur fish they look very unusual and even prehistoric they are bottom feeders and are rarely ever seen on the surface.
To a person not familiar with sturgeons seeing an 18 foot boney prehistoric looking fish could be mistaken as a lake monster..