River Itchen study launched as salmon 'at risk of extinction'
He added: "Extinction is looking like a real possibility within a small number of years if we don't really rally some activity."
The Environment Agency will be investigating the lower part of the River Itchen, between Woodmill to Mansbridge.By October it expects to "identify suitable options" to help salmon, including river habitat, improving fish passage and more community engagement.Jackie Mellan, the agency's project manager for the study, said: "The River Itchen has really changed in the past 10 years."The first step is finding out what can be done to improve the river system and increase its ecological resilience. For salmon that means improving migration to the sea and boosting their odds of returning to spawn."
'More smolt friendly'
Shoals of juvenile salmon start their journey from the Itchen to the sea in the spring, but experts say the fish are "struggling to get past the first hurdle" due to changes around the estuary.In a statement, the agency explained: "It was once used for transport and trade as a sea lock and onward travel to Winchester. Now, the current structures control water levels through Riverside Park."These structures present the biggest obstacles for smolts, especially in large groups."
It said the change in water velocity makes smolts "bunch up", adding: "Eventually the current carries them over or under the structures and back onto their journey to the sea."But the delay impedes their migration and worsens the odds of them completing their lifecycle and eventually returning as adults to spawn."The agency is now working with partners, like Wessex Rivers Trust, to figure out how to make fish passage "more smolt friendly".
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