Boyles Law and Charles Law are for real. If The BP doesn't affect the fishes swim bladder,changing their behavior from active biting fish to non biting fish. As the BP falls, where do they go ??

Two questions for you that answering might inform your own thoughts on BP:

1) How much depth variation do you think a bass might experience over the course of a normal day? That is, do you think it might range from, say, being 4 feet deep at times . . . to 12 feet deep? So, do most bass float and swim around at depths that vary 6, 8 or 10 feet, maybe more?

2) Do you think that a bass that occupies different levels of depths over a day, do you think it can discern the differences in pressure it feels from the depth it occupies (more pressure when deeper) differently than the pressure it feels from the air column pushing down on top of the water?

No, not trick questions. Curious as I think this solves it, makes anglers' minds up about the topic, how they answer.

Brad

Ken, that was me. Sorry, I didn't see page 1 here before I posted a minute ago with a few questions.

No, not 2 or 3 feet. A BIG swing in Barometric pressure ranges, say a full point, would only require a fish to move up or down in the water column by an inch or so. I'd need to go back and check my math again.

And, my point, then and now, is that fish move up and down in the water column all day long, every day, experience different pressures just like we do as we move up and down, say, after diving into the water. Everyone knows the ears begin to hurt at 10 feet or more.

The pressure is real. The WATER pressure is real. So, fish experience different water pressures, for certain, it's just that the air pressure variable is such a very, very tiny addition up or down.

So, a fish is supposed to be able to discern these minor fluctuations in pressure from air pushing down on water from the pressure of it moving up or down "routinely" in the water column all day long? How? Why?

No, the BP, to the extent it works, is just strongly associated with certain weather events. We do know that fish are affected by wind vs. dead water, clear skies vs. clouds, those sorts of things. It's these sorts of weather events that change fish behavior, not some particular very minor source of pressure on them. They live in pressure variances much more extreme than ours.

The one notation about fish cutting on and off from what, 29.85 to 29.87 . . . like two-hundredths of a point? C'mon! That is so far beyond silly, I wouldn't even know how to respond.

Brad

Barometric Pressures and equivalent related water depths in "feet of water":

29.50 = 33.422'
29.92 = 33.898' (one atmosphere)
30.00 = 33.989'
30.50 = 34.555'

Brad

Stripers, Sandies and Hybrids are the fish I am referring to. As they swim all day long and evidently have a much larger swim bladder than non-pelagic species of fish! Someone with biological expertise will probably confirm or knock out this assumption .

Good point, gborg. Different fish species have different needs as regards swim bladder size to live their "lifestyles."

My little chart just shows how little a fish need move up or down in the water column to offset the changes in atmospheric pressure even in big swings taking hours or even days to complete. My thoughts have always been "big deal," as the distance is so very minor compared to the depth range they move in . . . all day long without effects. That, and how in the world could a bass discern the difference between the pressure it'd feel from swimming around and that minor amount caused by air pushing down on water.

Now, barometric pressure and weather effects, we've got something!

Hope the chart helps.

Brad

You are the biggest Tool on the planet. It�s confirmed by Hubble.