There are 3 types of Hornpout/Catfish in NH.: The Brown Bullhead, Yellow Bullhead and Margined Madtom. The Yellow Bullhead is found in the Merrimack River and several other waters. Hornpout are bottom feeders and usually feed at night. They eat nearly anything, alive or dead, and may be easily taken at night or on cloudy days by fishing at or near the bottom with worms, minnows, corn kernels, crawfish, hellgrammites or dough balls. The Yellow Bullhead usually runs about 6-10 inches in NH waters and less than a pound, but may attain 18 inches and 3 pounds. The NH state record for Yellow Bullhead is 2 pounds 8 ounces from Pecknolds Pond in Chester, NH in 1980.