I have been wondering about fishing and air pressure lately too.. I know the day i checked it before going out fishing during the start of really cold spell we had just after new years the pressure was pretty high and our fishing was very slow.
I was out at dief today and the fishing was incredibly slow. We saw a ton of perch and only had about 3 bites but never landed any, we also saw a few other fish with little intereset other than looking at the hook and moving towards it then going past.