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.”

Treetops extending into 5-foot depths are prime. Tides apparently have little effect on spawning activity, as these backwaters are out of the current. “As soon as crappies finish spawning, they move into the main river, where they find sizeable current breaks,” Zaleski says, “such as pilings and breakwalls next to the main current.”

During early summer, crappies in some tidal rivers may concentrate in tight groups in spawning areas for a few days, before moving back into the river proper to hide behind those big current breaks. “The stronger the current, the more important big, stout, vertical current breaks become,” Zaleski says. “Bridge abutments, seawalls, wing dams, or rockbars that extend above the surface and totally block the flow become key areas. The best vertical breaks extend above the surface and create large eddies on the downstream side of the structure. Bigger is better in most cases. A current break should be big enough to create enough slackwater to comfortably provide for 10 or more crappies at a time. These crappies are sociable, trying to maintain contact with the most abundant forage and with each other at the same time.

“Crappies move a lot in rivers during summer. One bridge might be productive for two or three days, but before your next visit, the fish have moved 1/2 mile to 2 miles upstream. Within a few days they might move a mile or so back downriver and finally locate on that original bridge again. Same school? Hard to say, but it’s suspicious. For a short time when the water really warms up, crappies in rivers can be tough to catch. Or, perhaps I should say tough to find. If you can find them, you can generally catch good numbers,” Zaleski says.

“Crappies seem to stay near the main channel in early fall, but the main river gets nasty in winter. Big concentrations of fish begin to form. Unlike river crappies in Canada and the far northern states, however, these tidal-river cousins don’t go into the far ends of sloughs or backwaters to spend the winter. They usually stay in areas large enough for the entire school to congregate. That generally means bays adjacent to the main channel with minimal flow. And they don’t seem to require extreme depths to winter in. Often an area with a maximum depth of 10 to 12 feet is adequate. A few hardy people get out on the water to chase them, as tidal-river crappies remain quite catchable all winter long.”

Other Flowing Environments

Crappies live in and around current in a variety of other types of rivers and reservoirs. In the hill-land reservoirs of Maryland, they seasonally move into and back out of current areas. They move upstream in spring, out of 20- to 35-foot depths in the upper third of the reservoir to woodcover upstream in the main river. As mentioned in Chapter 4 on hill-land and highland impoundments, crappies living in the upper third of many reservoirs in North America move into and back out of the main flow of the river on a seasonal basis, dropping down into the reservoir during winter, but living in current areas from the Postspawn Period through mid-fall.

River crappies love current breaks, and current strength often determines how large a current break must be to attract fish. In rivers with minimal current, such as the Rideau River Chain in Ontario, they occupy the main river channel most or all of the year. Guide Jim McLaughlin, who works the Rideau, says crappies often position outside bridge abutments and pilings on the upstream side right in the main river channel during summer. But as Capps notes, only crazy crappies try to hold in the main flow of the lower Mississippi most of the year.

In some slow-moving rivers, crappies can use weedbeds as current breaks in the main channel. In large, powerful rivers, they’re rarely found in the main channel, no matter how large the current breaks are. In northern rivers, the fish leave current areas entirely, moving as far from them as possible when the water dips below 50°F at the surface. In the South, they might stay in current areas all winter, depending on current strength and water temperature. In the North, crappies move miles to find 20 feet of water to hole up in for winter. In the South, 10-foot depths can be acceptable all winter long.

Different fish? No. Crappies everywhere are the same fish with the same needs, but different climates modify those needs. The natural range of crappies, from south Florida into Canada, covers a wide spectrum of climates, from subtropical to boreal. Crappies range through disparate river systems and topography, where varying conditions force different responses to different problems. Conditions change with latitude, climate, and terrain, but our flat-sided friends have built-in attitude adjustment capabilities that allow them to thrive in all kinds of rivers, lakes, and climates.