Hot summer days might seem like a blessing. People flock to the beach, flowers bloom and insects thrive, providing food for birds and bats. But a warm summer can be an issue for other species, particularly those that rely on our rivers and wetlands.
Freshwater fish are under threat, with as many as a third of global populations in danger of extinction, according to an assessment.
Populations of migratory freshwater fish have plummeted by 76% since 1970, and large fish – those weighing more than 30kg – have been all but wiped out in most rivers. The global population of megafish down by 94%, and 16 freshwater fish species were declared extinct last year.