I bet a few of those big Catfish will turn up as a surprise catch in the Magothy and Severn rivers.
Stands to reason some moved into the rivers rather then return back up the bay.
One thing that might have huge impact on waters north of the bridge is the oysters that died off over summer / fall due to freshwater coming down the bay.
Most areas saw 90-100% die off. The live oysters support all types of tiny critters that start the food chain and draw in bait - which in turn draws in Perch / Rock.
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