thomas morris

How dose Barometric pressure affect fishing commercials.
Thanks Tom....

fish farmer

in my opinion it willaffect commercials more than other fisheries because of the stocking densities. High temperatures and pressure changes have an affect on oxygen levels and low levels will render the fish relatively inactive. I reckon thats why a lot of commercials have been fishing poorly of late - that coupled with spawning!

Would be nice to see a proper study on this.

billylowe

Giles Cockeran wrote a couple of articles about the effects of atmospheric pressure on fish behaviour. I think they were mainly about winter fishing but he reconed that changes to high pressure brought the fish either up in the water or into shallower areas. Low pressure having the opposite effect even in low temperatures. I don't see why the behaviour should not be the same in warmer months.

From personal observations I think Giles is right. He believes that this behaviour is to do with the effects of the pressure on the fish's swim bladders. Which does fit with the high pressure moving up theory.

thomas morris

The last two system of high and low had pessure rising in low and falling in high How do you respnd to that.. Also the presure more often than not is never stable
One day high two days low etc....

fish farmer

Interesting stuff eh?

justin case

I also wrote about this some time ago as I found this quite an interesting issue so researched this in great depth, So I will try to explain this in Laymans terms

Barometric pressure effects fish massivly its the accumalive weight of a column or air from the top of the atmosphere to ground level as moisture builds up that column becomes heavier creating higher pressure and lower pressure is the reverse.

Fish have a swim bladder which they use to maintain zero boyancy, when the extrenal pressure changes the fish can adjust its internal body pressure via the swim bladder which stops it either sinking or floating, large chabges effect fish more than slow gradual changes and it doesnt matter which way on the scale the change is, as that just effects the weather,

Submarine shaped fish seem to adjust quicker than the flatter fish like bream , and it probably has something to do with why submarines are shaped the way they are. have you ever caught a skimmer or a bream and put it in the net to see it lay there on its side for 20 minutes beore it swims of ? and carp rarely do it ? Pressure out of the water is less than the pressure in the water, as you remove the fish for unhooking the fish goes into a mode of changing its internal pressure to create a balance to that of its surroundings then you put it back in the water and its confused again, carp have a near perfect shape them small changes dont seem to effect them whilst unhooking.

Its quite a complicated subject but from memory on a regular day with regular pressure we have around a ton per sq ft downforce, as humans we don't notice the subtle changes gravity and other factors play there part, but fish are incredibly complex and external pressure sensitive, last year we had around a month of high pressure the Thames looked like a sheet of chrome even with a small breeze the commies and lakes were similar that is the extent of the weight of air pushing down

constant highs and lows dont have any significant effect other than weather changes it brings its the quick changes that cause the fish to sulk while they ajust

JC

__________________

greybeard

Bloody hell Justin, I need a cup of tea after that!!

thomas morris

how long is the ajustment period insettled pressure...If the presure is changeing from one day to the next or even from morning through evening Do you ajust your feeding to still fish high bait high pressure low bait low pres..And vary the amount of bait acordingly...

justin case

John so did I after typing that time of the morning and going on the typo's maybe a coffee.


Thomas You would feed to bites as usual nothing changes you just won't catch as much if the variants are big, there is no way to monitor how fish are reacting to pressure change other than your float.

I don't know any scientific studies that have been done to clarify fish feeding habits against pressure, it would be good to see though,

__________________

thomas morris

Thanks for sharing your views