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​Flathead catfish can be found in substantial numbers in the Conowingo Dam pool and the Lower Susquehanna River below the dam. They are also found in the upper Potomac River. The fishing tactics for flathead catfish are much the same as for blue catfish.

There are many different types of bottom rigs to use when fishing for catfish. The simplest is a three-way swivel with a sinker rigged about 5 inches off the bottom and a J-style hook with bait. Those who have been targeting blue catfish for some time agree that a slit 2-inch cork float helps keep the bait slightly off the bottom. Many blue catfish anglers also believe in some type of rattle that is rigged ahead of the circle hook to help attract catfish. A barrel swivel is usually placed about 24 inches or so from the float and circle hook as a stop for the sliding sinker. The length of the leader can be adjusted, depending on the current, a shorter leader for swift current. Some floats come in the form of what looks like a crankbait or plug with no hooks and a rattle inside with the purpose of keeping the bait off the bottom and attracting catfish. Catfish have a very well-developed lateral line which helps them detect movement, their barbels also help detect smell.​​

Sliding sinkers or fish-finder rigs are needed when fishing with circle hooks. When fishing from a boat, egg sinkers are commonly used. If fishing from shore, a bank or pyramid sinker may be needed to hold bottom in river currents. When fishing from a boat, conventional reels placed on free spool with the clicker on works wonders in allowing the catfish to move off with the bait and hook itself in the corner of the mouth when the reel is engaged. Spinning reels are popular when one must cast from shore and a bait runner type reel can be a real asset.

Fresh cut bait is the most popular bait to use, and common baits include menhaden, gizzard shad, white perch, bluegill sunfish, eel, or a selection from the fish market. Wild shrimp works as does chicken liver. Anglers seeking out the largest blue catfish of 60 pounds or more often use live bait. There is a prepared dough-like bait usually made with blood, cheese, and other stinky stuff and is placed on a treble hook, often with a spring-like device around the hook to hold the bait in place. Be advised, using this type of bait and hook can really get you in trouble when a catfish swallows the treble hook.

Chumming with ground fish can work wonders when fishing for blue catfish, especially from a boat. Ground menhaden is easily purchased, and it is a good oily fish to use to attract catfish. A metal chum pot weighted to rest on the bottom is one of the best ways to develop a chum slick to attract blue catfish to your anchored boat.