They search the bottom by dragging the chin barbel and the sensitive tips of the ventral fins as they swim to and fro, either for food, or to stir up shrimps and other food items. (Herrick)
The maximum size is about 15 inches and 1-1/4 pounds, but few of them are more than 9 to 12 inches long. Most common close to stream drainage.
A delicious little fish that you won’t find in markets.
From Fishes of the Gulf of Maine by Bigelow and Schroeder, 1953