Falling water seems to be a concern to fish ... instinct is for them to move away from shallows, so as not to get stranded. Probably instinctive for them to not try & nest in these conditions, too, even if the water temps are good. It's instinctive for Crappie to not drop all their eggs into one nest ... helps keep the gene pool "clean", and offering protection from predators, as well as falling water. The faster the drop in water levels, the more it signals danger to the fish.
Rising water opens up new territory, as in feeding grounds & nesting sites. Falling water signals it's time to retreat to safer (deeper) areas.
This time of year, as water temps rise, the warmer waters are going to be in the upper levels. Crappie will seek out the level at which they are comfortable, yet still safe (camoflauged by depth), as well as the level that the foodsource is likely present in. They probably suspend during water level drops, so as to stay in that same temp/safety/food zone. They're scattered & hard to find, for the simple reason that they're not schooled tightly, during this period, like they are most of the rest of the year ... and they're spread out over a wider range of the bank, while they're feeding up for the rigors of the spawn & nest building and guarding, so they're going to back off from receeding water as individuals, rather than a cohesive school.
Aside from backing off & suspending, the only other behavior I've experienced is for them to drop down to the bottom (out deeper) & wait for stable conditions. Though that may be as much a product of major fronts, as dropping water levels.
As I don't usually fish these conditions, I have no "proven techniques" to offer. But, faced with these conditions, while already fishing ... I'd probably resort to slow drifting live bait, like small minnows or Shad ... downsizing to 1/64 - 1/32oz jigs (slow trolling) ... or just packing up and coming home, and waiting for more favorable conditions.
... cp


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