Pesticides from agriculture & pet flea treatments can kill invertebrates in rivers leaving fish & birds with little to eat. They kill off the tiny creatures who eat algae - algal blooms become worse, killing even more river creatures.
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https://www.theguardian.com/environment/2025/jun/17/dangerous-pesticides-pet-flea-treatment-detected-english-rivers
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https://www.theguardian.com/environment/2025/jun/17/dangerous-pesticides-pet-flea-treatment-detected-english-rivers
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https://www.theguardian.com/politics/2025/jun/16/labour-cutting-farming-budget-in-england-by-100m-a-year-spending-review
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https://theconversation.com/pet-flea-and-tick-treatments-contain-pesticides-that-end-up-washing-into-the-environment-heres-how-226685#
(Source: Private Eye magazine)