whats pressure got to do with it

[river huntfish]

I know that fish are more likely to be finicky and not exactly cooperative when there is high pressure from a front or something. But what exactly happens most of the time with the fish is it worth going out on high barometric pressure days.

[Minnetonka]

It's not high pressure so much as it is a sudden change of pressure. I think a low pressure system put them off more and drives fish deeper. The atmospheric pressure doubles every thirty three feet down. When you bring a perch up from 30+ feet of water, often the stomach is pushed out of the mouth by the swim bladder that a fish uses for buoyancy control. A fishes swim bladder is filled with gas and they can adjust this over time. When we get a sudden low pressure system, it is just like bringing the fish up in the water column a few feet. I believe that it makes them uncomfortable and they slide deeper into the water to equalize the pressure. It is kind of the opposite of when you dive under water and your ears hurt due to increased pressure on your ears.