|
|
|
|
 #39 25 Aug 2020 at 8.42pm | |  |   |
|
In reply to Post #38
Every lake is different, you need to be checking your d.o. levels dawn and dusk to know what's occurring.
|
|
|
|
|
#38 25 Aug 2020 at 3.07pm | | | |
|
Would it be worth running an aerator even when we have stormy/windy conditions like now... Strong winds and heavy rain overnight? Seems like a waste of time to me but I've been known to be wrong before 
|
|
|
|
|
#37 19 Aug 2020 at 1.16pm | | | |
|
In reply to Post #35
The irony was the EA had advised chopping all the trees down over the top of the stock pond to allow air flow and light, but was reluctant to chop them back until the whole Stock Pond was protected with Lines above to keep Cormorants and Heron at bay. If we had have chopped them back the stock pond would have probably got wiped out as well, and with not doing all was fine!
But I would not compare a 50m x 25m Stock Pond with any lake, it was pure luck the tree’s actually sheltered it and stopped the water inverting.
From what I’ve witnessed/observed no two waters are alike and each one does to a degree have its own unique habits. Some behave and never have any problems while others are just a constant pain in the arse and have to be constantly monitored all year round; they just cannot be trusted – as I keep saying to members “If it looks odd then something must be odd!”
~ I thought Pike and Trout where highly susceptible to low oxygen levels too – in reality with the EA bosses stood there, the exact opposite was witnessed by all!
~ Totally agree Paul as regards having Pumps on standby ready to use, it's a no brainer really - for just the cost of a gallon of Petrol, all the stock could possibly be saved in the event of a pending disaster
|
|
|
|
|
#36 19 Aug 2020 at 12.50pm | | | |
|
In reply to Post #35
A further factor is that lightning converts available oxygen to ozone which not only lowers oxygen levels but is detrimental to bacteria in itself.
|
|
|
|
|
#35 19 Aug 2020 at 10.46am | | | |
|
In reply to Post #32
So tree cover is a good thing? We have a club water that nearly lost them all last weekend as well, luckily the club managed to borrow four pumps and with people manning the pumps 24 hours a day to ensure they are kept running it seems the fish loss has been limited to about 10 carp, sadly about 50% of the biggest fish in the lake.
It's an old estate lake and, when tested, the oxygen level in one of the bays was basically zero (0.01) and it wasn't much higher in the main lake. I'm sure the EA said that trees were a bad thing as they prevented the wind getting on the lake and getting oxygen into the water , as well as shedding all their leaves into the water.
By the way the EA had no pumps as they were already out, lots of waters suffering the same problem. The club has now purchased two but IMO every club should have enough pumps to cater for two or three waters at a time needing help.
|
|
|
|
|
#34 19 Aug 2020 at 10.30am | | | |
|
In reply to Post #32
Trout are more susceptible to low DO than almost all coarse fish. This is a biological fact that simply cannot be disputed.
|
|
|
|
|
#33 17 Aug 2020 at 6.32pm | | | |
|
In reply to Post #32
I hear its bad yesterday/today, willow Park, and most of the Farnham waters closed, heard they lost a 51lb from the lake behind sandhurst.
|
|
|
|
|
#32 16 Aug 2020 at 9.12am | | | |
|
In reply to Post #31
What surprises me Andy is how little preventative measures Fisheries take, when in reality for the price of replacing 1 x 20lb+ Carp you can buy all the equipment required to guarantee a disaster is not going to happen.
I was also told Trout were very susceptible to low oxygen levels – it’s obviously not true as not one was found dead, this last week Trout can be seen leaping out here and there, none have ever been stocked since the fish kill.
I’ve lost count how many I’ve seen, there was 12 mass wipe outs just on that Monday morning ours did it, all totally different waters in varied locations, all stocked with various species.
I’ve witnessed a water wipe out its stocks via inverting, while a heavily stocked Stock Pond 30ft away was totally un-effected, reason – tree cover, as the trees kept the surface water temp stable, not allowing it to suddenly cool down and invert.
|
|
|
|
|
#31 16 Aug 2020 at 6.31am | | | |
|
In reply to Post #30
Yes it's surprising how stratified the water can become even in relatively shallow lakes.
I lent my two emergency petrol pumps out to a local syndicate yesterday morning, they're having big problems.
Unfortunately I've witnessed first hand four fish kills over the last ten years, on three very different types of lake. Heartbreaking to see even when they're not your own this.
Amazing how those trout survived on your lake, I'd always been led to believe that they were more susceptible to low d.o. levels than just about any other species?
|
|
|
|
|
#30 15 Aug 2020 at 7.51am | | | |
|
In reply to Post #29
Cheers Andy, so do we all.
It's such a rich water it makes it very prone to doing crazy things, mainly stratification - then inverting which as you will know is the worst case scenario you can have. Last time it did it about 5 years ago it took it 2 hours to turn from gin clear highly oxygenated water with nothing wrong, to turn too water that looked like thick black Coffee and oxygen readings of 2%! (Killed everything but Trout)
Nobody believed a water could invert and turn so fast, but two EA staff was there to witness it happening, three DO Meters all gave a reading of 2%.
If we have a bit of rain every few days, and a bit of a breeze it's fine as the water table gets disturbed enough not to start separating into layers.
It's when it's totally static for more than a few days combined with hot weather we have to be on our guard, there's a pair of High pressure 3" Pumps on stand by all year round, only takes a couple of minutes to start the engines up and your "Churning" the water column over at a rate of over 30,000 litres a minute.
|
|
|
|
|
#29 14 Aug 2020 at 10.10pm | | | |
|
In reply to Post #28
I'm guessing that you're having a bad algae bloom?
My last batch of barley extract doesn't seem to have held the algae back and I was getting some very high daytime readings. Back down to 75% today.
I hope everything stays healthy on your place.
|
|
|
|
|
#28 14 Aug 2020 at 7.32pm | | | |
|
In reply to Post #27
That's around 9am in the morning, been getting high readings all summer.
|
|
|
|
|
#27 13 Aug 2020 at 5.08pm | | | |
|
In reply to Post #22
I'm assuming that the 146% was mid-afternoon to early evening? If so what sort of readings are you getting in the lead up to dawn?
|
|
|
|
|
#26 12 Aug 2020 at 11.23am | | | |
|
In reply to Post #22
Keep an eye on your fisheries guys, I see a lot of waters are struggling today with the heat and fish have been on the top gasping. Like to think aerators are the norm now for lake owners.
|
|
|
|
|
#25 11 Aug 2020 at 4.39pm | | | |
|
In reply to Post #13
Oh no, that’s bloody tragic.
|
|
