Depletion of oxygen and dying fish.

Hi. My name is Shayne. I’ve been leasing my lake now for the past 3 years The 2 years with my 2 mates who past their share to myself to run the lake myself. We turned the lake around when we first took over and enhanced what the previous owner had done. Over the past year the oxygen levels have been depleting especially with the weather recently. Highs and low pressure. No rainfall. The lake is a still water and relies on the rain to turn the water around keeping the algae down and oxygen up. I’ve worked really hard in the past few weeks whilst the sun was blazing . Unfortunately now my fish are dying. I’ve since found out there’s an enormous amount of roach in the lake and these are also killing the oxygen. I’ve tried all I can to help keep my fish ( carp and koi ) alive but sadly I’m losing them day by day. I’m wanting donations so I can get the lake netted and also purchase a lake fountain powered by batteries charged from solar panels as there’s no power there. This fountain will help keep the lake water moving and help to keep the algae blooms at bay. I’ve treated the lake with blue due to try keep the sun out and stop the algae blooms. I’ve spent all I can and now I’m panicking over losing the carp. Some of them being worth £700 +. I’m gutted this is happening. Fingers crossed we can sort this with help from yourselves. It’s a lovely spot and full of nature. Especially kingfishers. thank you for listening. Kind regards. Shayne.