Proposals to build a tidal barrage across the Mersey Estuary have sparked concerns for the myriad wildlife in the area.

The Mersey Barrage is a proposed tidal barrage across its namesake estuary, which is situated between Liverpool and the Wirral Peninsula. The River Mersey is considered to be a suitable source of marine renewable energy in the UK because of its strong current and tidal range of up to 10 m.

The idea of a barrage in the Mersey was first floated as long ago as 1984. This year, in March, the Mersey Tidal Power Project was launched by Liverpool City Region – and the plan was put to public consultation in September.