I would think the opposite to be true. High pressure typically have clear skies and drive the fish into hiding places, ie sunny days This is not taking into account the mention of streams flows running lower and clearing. I'm thinking more of cloud coverRising barometer is generally correlated with dropping stream flow and clearing water following a storm. Salmon and steelhead fishing in rivers is often better under such conditions. Fishing also tends to be better in the salt under rising or steady high pressure, in my experience anyway.