(Acipenser oxyrinchus oxyrinchus)
Sturgeon is common name are some 26 species of fish in the family Acipenseridae.
These "living fossils" of fish evolution once ranged widely throughout the Mississippi River, the Great Lakes and the Hudson River. Occasionally, the lake sturgeon's dark form can be discerned in reedy shallows or near river mouths. The glimpse is as rare as it is startling.
In the last century, this large was often regarded as a nuisance because it became entangled in and ripped commercial fishing nets. Only later did the sturgeon become prized for its meat, eggs (caviar) and oil. A gelatin from the inner lining of its air bladder was used to make isinglass--a substance used as a clarifying agent in jellies, glues and in the isinglass windows of carriages and early cars.