ferryman

Yesterday Saturday 26th April I fished a popular venue on a match with 70 anglers on it. This venue is noted for very good weights being caught, recently even in the cold weather weights have been in the 70lb plus range with some topping 100lb. However on the match the majority of anglers failed to even reach the 10lb mark.

The weather on the day was 20decrees with a slight wind.

The general reason given for the poor catch rate was suggested by the anglers to be the air pressure.

The questions I need to ask are:

1 In what way does the air pressure effect the fish/fishing?
2 Do the fish know the air pressure has changed, and if so, how do they know it has changed?

FORDY 1

Air pressure effects them greatly for about 24hrs if it's a big swing in pressure.High pressure pushes down on the water infact compacting it,it effects thier swim bladder i recon and takes them a while to adjust to it.Just my theory,i just a noddy.

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justin case

Your correct Fordy

Basically as the air pressure increases the weight of the air forces down on the water increasing the water pressure, very little if any air dissolves into the water and its just like a huge weight pushing down.

Im not sure if this has been proven but it would seem that the fish's swim bladder compresses to keep an equilibrium or a neutral boyancy under high pressure, apparently it causes discomfort for the fish putting them off food,

The opposite to this is when you keep a fish out of water its swim bladder expands to neutralise the air pressure thats why sometimes the fish lay on their sides for a while before swimming off.

A geat example of this is something we use every day, "the pellet pump" look what happens when you pump it, the pellet cant adjust it has no swim bladder the water is forced into the pellet.

I hope that explains a little

ferryman

Thanks Fordy and Justin Case for those answers, what pressure do I need then to have a good days fishing.

justin case

Depending on your equipment 14.7 lb per sq in, 29.92 inches,or 1,013 millibar thats at sea level the higher up you go the less pressure and vice versa

ferryman

Cheers J.C. that makes a lot of sense to me.

jeff

So you need low pressure to have a good day fishing then ?

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justin case

I think Stability is the key,

Larry Teepot

looks like you need a Phd in science,

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How can I go on From day to day ....Who can make me strong in every way.... Where can I be safe ....Where can I belong In this great big world of sadness

jeff

With our weather we don't get much stability, think I'll just take my chances with the weather forecast

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Two's company, three's
the Musketeers.