Rich Zaleski, a longtime In-Fisherman contributor, has written widely about crappies and enjoys hunting slabs in large tidal rivers like the Connecticut. Tides influence the flow 12 miles or more inland all along the Atlantic seaboard, and when tides are incoming, the flow actually backs up and moves inland. When tides go out, the flow continues on its natural journey to the sea. These are unique environments and crappies must adapt.

“In these back-and-forth flows, crappies use one side of a current break as high tide approaches, switching to the other side as low tide advances,” Zaleski says. “As flow increases, they become more active, positioning themselves to ambush baitfish that are funneled past big current breaks. At high tide or low tide as flow slows to a trickle, crappie activity declines.

“When the tide isn’t moving, there’s nothing to concentrate crappies or position them in a predictable location. It’s best to move upstream or downstream 5 to 10 miles to moving water,” Zaleski says. “On a tidal system, the water’s always moving somewhere.”

Moving well away from flowing water to spawn is a common trait among river crappies. “What I never find are early spring movements into shallow water in rivers,” Zaleski notes. “I never find crappies shallow in March. They travel into bays and backwater areas behind blueback herring and alewives, which move behind any little current break they can find in 2 inches of water, where crappies can’t follow. So, in spring, crappies move out into the middle of shallow bays, in 8 to 10 feet of water.”

This movement takes place as water temperatures approach 58°F. “At 64°F, herring stack along the banks of those bays,” he adds. “Crappies respond by holding near high spots or cover in the center of a bay. The best cover or structure reaches within a few feet of the surface, where crappies can get more sunlight on their bodies. This is similar to scenarios in lakes or reservoirs, where they use shallow cover in spring. But in tidal rivers, that cover is generally occupied by bass and blueback herring.

“Crappies in the Connecticut River spawn in May or sometimes the first week of June,” Zaleski says. “Peak activity takes place when water temperatures are a bit under 70°F. The carp-like spawning activity of blueback herring and alewives that dominate the banks often pushes crappies into thick brush, where spawning activity is visible in fallen treetops over 5 to 6 feet of water. They don’t spawn on the bottom but use the ends of trees, where all or most of the brush is submerged, spawning on conglomerations of branches between 1/2 inch and 1 inch in diameter. Even a sparse treetop with nothing more than a couple of sticks can hold 8 to 10 spawning crappies. They also spawn on banks, but there they often run afoul of spawning herring and alewives.”