Meet Fred, a 45-pound flathead catfish living in a river somewhere in the U.S. Doesn’t matter which river, because Fred would behave roughly the same no matter where he lived. Researchers have discovered that while no two flatheads behave exactly alike, all of them follow the same basic rules—winter, spring, summer and fall—from the day they hatch til the day they die. Anglers who understand Fred’s day-to-day lifestyle, in conjunction with his seasonal cycles, have better chances of meeting him and his kin face to face.
In-Fisherman’s Calendar Periods describe Fred’s annual cycle well: Winter, Prespawn, Spawn, Postspawn, Summer, Fall, and back to Winter. The exact timing of the phases varies around the country. Prespawn, for example, may be in late March or April in Texas but not until May…