In the past five years, there have been almost 100 cases of the UK's Environment Agency deploying emergency oxygen to stop fish in English rivers from dying
English rivers were pumped with emergency oxygen in a last-ditch effort to save fish from dying on almost 100 occasions in the past five years,Rivers can become deoxygenated for a variety of reasons, including sewage dumping that encourages the growth of bacteria, plants and algae, all of which consume oxygen. Hot weather can also play a role, as water holds less oxygen at higher temperatures.
To combat these effects, the Environment Agency in England has emergency measures in place to pump oxygen into rivers with the aim of preventing fish and plant deaths.Last year saw 25 instances of the EA doing this, according to a freedom of information request, while there were a total of 74 deployments between 2018 and 2021.
he says. “The signs to look out for are fish gasping for air, appearing lethargic in the margins and dead fish floating on the surface.”Get a dose of climate optimism delivered straight to your inbox every month.The EA pumps oxygen in several ways, such as using liquid hydrogen peroxide, which breaks down into water and oxygen, and mechanical aerators, which increase oxygen in the water body by disturbing its surface.
Climate change is likely to increase the need for emergency oxygen in rivers in the future, says Storey. “There are two factors at play here, increasing temperatures and extreme rainfall events acting in combination with underlying pressures on the aquatic environment,” he says. “If global temperatures continue to rise and stay higher for longer periods, this will cause ongoing challenges for wild fish populations and fisheries.
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