I think that when the BP does the most damage to fishing is when it is unstable. It affects their air bladder in a way that is uncomfortable for them and they shut down. Even an extremely high BP can be productive if it is steady, you just have to look deep where their bladders aren't as effected by the high pressure. Not saying that the fish aren't in those shallower waters, but good luck getting them to bite. The oppisite is usually true for low pressure systems, especially right before a storm/front. I have caught them just inches below the surface in the dead of winter right before a front. This is just my opinion by the way, but it has been a very effective way of getting me on the fish more quickly and cuts out a lot of guess work.