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ALLROUNDERGREG

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The warning signs go unheaded

 Kevin Nashes church lake loses two english fifties and four other big carp when oxygen drop whie he was on holiday staff and anglers fishing the water failed to recognise the signs.This water has everything in place pumps and airiators but the people on sight failed to see what was happening till to late. Another famous carp water in essex also lost fish but this is due to overstocking according to fishery scientists the club Colchester angling presavation are plannig to remove hundreds of double figure carp and tonnes of roach. this time of the years is the most dangerous for fisheries everybody involved has to be on the ball if you see pike going bellyup they are one of the very first signs of lack of oxygen and the warnig bells should be ringing be extra aware at this time of year and keep your eye open for the signs of fish in distress.

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tankie63

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Aug 10

Posts: 574

tankie63 says:

Re: The warning signs go unheaded

Thanks for the heads up on that Greg. Our lake at the caravan site is only quite small and there are only a few of us that fish it. It has a large expanse of lillies and just recently, they have sprayed them to kill some of them off, I'm not too happy about it as the dieing leaves sink and am worried about them rotting and causing loss of oxygen.

tankie63.

Bernie (Tankie) Webb. Born to fish, forced to work.

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ironfever

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Apr 07

Posts: 3123

ironfever says:

Re: The warning signs go unheaded

 yep some wise words there from Greg.

Tankie I think you are right to be concerned. We are now having an Indian summer which gives high temperatures when all the deciduous plants are rotting back. Those two ingredients spell danger in any enclosed water. The nitrogen cycle just cannot operate properly in those conditions and all the time the water temperature is rising. My advice, for what its worth, get those aerators on during the day but off at night so nature can do her job. The problem with alot of surface aerators is that they simply arent up to the job and dont oxyginate the bottom where all the decaying is taking place. The answer is a sub surface aerator.  

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ALLROUNDERGREG

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Re: The warning signs go unheaded

ironfever said:

 yep some wise words there from Greg.

Tankie I think you are right to be concerned. We are now having an Indian summer which gives high temperatures when all the deciduous plants are rotting back. Those two ingredients spell danger in any enclosed water. The nitrogen cycle just cannot operate properly in those conditions and all the time the water temperature is rising. My advice, for what its worth, get those aerators on during the day but off at night so nature can do her job. The problem with alot of surface aerators is that they simply arent up to the job and dont oxyginate the bottom where all the decaying is taking place. The answer is a sub surface aerator.  


Ironfever what you say about the aeraters is a common mistake. this is from one of my IFM hand books The dissolved oxygen problem in ponds can be accentuated by running aerator during the day and turning it of at night. This strips out excess oxygen in the afternoon so that there is less to use up in resperation overnight .It is best to run an aerator [such as a fountain] all the time or just at night. I know it sounds a bit odd but that is the way it works. At church lake they run normaly 7pm to 7am and that did not cope they should have run them 24hours but did not notice till it was to late .I would not like to have been one of the people on that fishery when this happened Iwould not be happy if it was my water and I left staff to look after it for it to go ti*s up.

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ironfever

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ironfever says:

Re: The warning signs go unheaded

 I stand corrected and respect your superior knowledge in this field. Thanks for that Greg . I suspect alot of water owners are under the same impression as me. I have not seen many aerators in operation at night which proves they are making the same mistake.

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ALLROUNDERGREG

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Re: The warning signs go unheaded

ironfever said:

 I stand corrected and respect your superior knowledge in this field. Thanks for that Greg . I suspect alot of water owners are under the same impression as me. I have not seen many aerators in operation at night which proves they are making the same mistake.


It is better to run at night than during the day but if conditions are bad you will need to do both if a disolved oxygen check is carried out at 4am in the morning that is when it should be at its very lowest reading then it can be worked out what you need to do for the next 24hrs oxygen levels below 5mg/1 will cause fish stress levels should not be allowed to go below 2mg/1. I have a very comprehensive library of  fishing husbandry most of it is not in my head but on the shelf

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Friday, 24 May 2013