This The Guardian article discusses how common pesticides have been found to starve fish ‘astoundingly fast’ by killing aquatic insects.
The research is the first to reveal the knock-on effects of insecticides on fish. Harm to bees is well known, but previous studies in Europe have linked neonicotinoids to die-offs in other freshwater species including mayflies, dragonflies and snails and also to falling populations of farmland bird that feed on insects, including starlings and swallows. The insecticide has also been shown to make migrating songbirds lose their way.
The research, published in the journal Science, looked at data from Lake Shinji spanning the decade before and the period after the introduction of neonicotinoids in 1993, from which point the pesticides started running off into the lake. They found neonicotinoid concentrations in the water frequently exceeded levels that are toxic to aquatic invertebrates.