TunaCell,
My thoughts lean more towards the fact that even a small increase in temp close to the rocks will sometimes stimulate the critters that live amongst them or swim next to them.
In early spring I've found small areas of bottom in Cuttyhunk where the temperature spikes a few degrees because of depth, color of bottom and lack of current, and that's where the bass are hanging.
The heating of the rocks is the least significant factor in why the stripers come calling. Obviously they go there because they're curious as to why so many people are all lined up along the rocks.
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