I've just heard of a 50 which has died on my syndicate water, plus a couple of 40s, has anyone else around the country had the same thing happen ?

It's well after spawning , is this unusually hot Summer to blame .

In reply to Post #1
Was the water airated? Worried about the same happening on my very low stock weedy lake😭

In reply to Post #2
No don't think it was aerated, 12 acres with very excessive weed growth this year !

I'd imagine the excessive heat will only add to the normal mortalities for whatever reason, of which there could be many. Have any of the fish been checked for signs of disease or being spawn bound? Were they always that weight?

Generally heavily weeded lakes are less likely to suffer dangerously low oxygen levels than algae dominated waters. That said a completely choked lake isn't ideal and if too much of the weed suddenly dies back at the same time there will likely be low d.o..
Big fish are usually old fish and nothing lasts forever, I'd be more concerned if multiple young fish were dying.

The real danger isn’t during the hot weather. Fish will adapt to this with the help of some airation. The real concerns is how this hot spell breaks down. If we have a gradual shift in pressure, temperatures and rainfall then it’s not an issue. However if this hot spell ends with sudden heavy thunderstorms, that’s the real danger. The sudden drop in pressure and water temperature can kill all the algae very quickly. This algae is broken down by bacteria in the water, using up the dissolved oxygen in the process. Causing sudden and dramatic oxygen crashes. We have a breakdown in weather forecast for around the third week of August and there will be a lot of clubs and fishery owners holding their breath. Fingers crossed we get a gradual change in conditions over a week or so.

In reply to Post #1
warm water will not hold onto dissolved oxygen as well as cold water. so thats another factor to think about too.

In reply to Post #4
This was the normal weights for these fish, so no not spawnbound , not particularly old fish either ! I'd say no more than 20 yrs maximum! Hopefully that's the last ones to go !

In reply to Post #8
Fingers crossed mate 👍

They're not these faster growing shorter lived strains are they?

In reply to Post #9
I honestly don't know what strain they are ? But my guess would be maybe ! There growth rates have been incredible really ! Going from 20s to 40s in around 6 years or so ?
The 50 went from 34lb to 54lb top weight in 5 years !

Here in Spain at least, fish deaths are more frequent after spawn than due high temperatures and heat
Last month a 75 lb mirror dead, it did not die due to high temperatures, but rather due to mishandling and being kept in a retention sack for hours in shallow and low oxygen water.

In reply to Post #11
Well there's no mystery as to why that one died then !