Air Pressure - an Issue?

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Andy Hancock 2

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Hi chaps

Could anyone make it clear to me the subject about air pressure? Is it good when its high or low? How does this affect the fishand their feeding?
 
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Baz (Angel of the North)

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Anything below 1000. There's a low coming in this week. Get out there. Check out the Met Office site.
 
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Bryan Baron 2

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High pressures tend to bring the fish to the surface. Lows tend to send them down.

You are looking for a steady pressure in my opinion for the best fishing.
 
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Chris Bishop

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It definitely affects pike, though I've never been sure if it's tghe pressure itself or the different weather patterns it brings.
 
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Sean Meeghan

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Its not as simple as high or low, you've got the complication of rising or falling, cold or warm front, wind direction, air temperature and whether you've got clean underpants on or not.

My best guess is that a warm front is good in winter, rising pressure is good in Summer and settled high pressure is good in the Summer and not bad in Winter.
 
ANDY SKI

ANDY SKI

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Too much pressure isn’t good for fishing /forum/smilies/big_smile_smiley.gif
 
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Bully

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I really struggle with this. If you search the threads there are some rather "heated" debates about this subject, and especially those who argue how fish can detect changes in air pressure.

What I cannot fathom /forum/smilies/smile_smiley.gifis how fish can detect changes in air pressure given the fact that if they sink a number of meters in the water the direct impact of that change far outweighs any impact of changing air pressure on a body of water?

The impact of ahundred millibars change in air pressure on a body of water is insignificant compared to a fish changing depth in that body of water by a few meters.

The key reason for fish changing their behavoir, IMHO, is as suggested above, caused by the associated weather change.
 
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Andy Hancock 2

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Cheers for trying to clear the subject up for me, it seems like there alot of different ideas out there and are many factors that need considering.
 
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stephen webb

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Perhaps a scientist can explain it better, but high and low pressures change the density of water as does changes in temp. These changes affect the way a fish senses thngs, is my understanding of it.
 
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Gary Dolman

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I read an article last week in the angling press regarding phases of the moon and particularly barbel fishing, in fact they printed the upcoming moon phases and the prognostications for fishing. I know Keith Arthur is a convert, and I think the lads who run the Barbel Adventures website were the source of this data, and they swear by it after analysis of their results.

I had a few days last year on the Exe, when the river looked perfect for float fishing, but due to a high pressure system the results were very average. I am not sure of the moon phase, as I don't keep a diary, and after 50 years of fishing I am unlikely to start.

I know there a few posters of a scientific bent on here, have there been any studies on the effect of air pressure on feeding patterns?
 
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Bryan Baron 2

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The problem is the number of variables. You would need a van full of equipment to determine the effects on the fish.

I read a article in the free ASDA magazine with Rodger Black and he says the best bit of advice he was ever given was to

Concentrate on the things he could control and not waste time on the ones he couldn't.

Good advice in my book.
 
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Bryan Baron 2

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John Conway did a review on a book regarding barametric pressure with regards to salmon fishing. This might be of intrest to you
 
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keora

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Air pressure is an indicator of changes in the weather, or the current weather being experienced - but the underlying reason for changes in weather is the battle between cold fronts bringing bad weather in from the North, and warm fronts bringing warm moist air from the south.

You can get significant changes in weather with just a few millibars change in air pressure - for example a change from 1000 mbars to 995 mbars is only a drop of 0.5% yet it could indicatea warm weather being replaced by coolshowery weather.For me, it's highly unlikely that a fish in a dense medium such as water could detect minute pressure changes in the atmosphere.

These fairly small changes in air pressure are not sufficient to compress the water, so there's no validity in the idea that fish can detect air pressure changes from changes in the density of water.

My preferred weatheris a warm day with some wind and moderate cloud cover. This is normally associated with high pressure. Yet in winter high pressure often brings clear nights, overnight frost and fog in the morning.
 
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Bob "chubber"Lancaster (ACA)

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your right keith in your assumption , as i recently spoke to a school science teacher on this very subject , he specialises in pond life fish and the like and told me the same thing. Such small changes would be very insignificant to a fish.
 
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