I think the article is confusing when it says the fish are to be killed to deter angling on a lake where angling is banned anyway,
Surly the lake can be treated to improve the water quality?That's not half of it flightliner http://www.stgeorgenp.org.uk/wp-content/uploads/2012/08/AdverseEffectsAnglingStGPark.pdf
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Sounds like idiot bivvy boys are to blame entirely. And the pond gets blue green algae which is possibly why the fish can't be moved. Sad to say it but the proposed action sounds like it may be the only viable option. Or they just remove the carp, may help.