A redfish crab gets crushed against the plates in the back of a fish’s throat, dragged across oyster and cordgrass, and mouthed by a fish that feeds nose-down on the bottom. The good ones are built to take all three. On a flooding fall marsh a crab that lands soft, rides hook-point-up, and sinks at a fiddler’s pace gets eaten ahead of a prettier fly that lands hard and fouls on the first strip.

Most crab tutorials spend their time on the body and the legs and treat weight and orientation as afterthoughts. For a redfish on the flood, that order is backward: start with what the fish is and what the water does to the fly, and let the rest of the tying decisions follow.