estuary

The estuary already has a long list of non-native species, including bass, water hyacinth, Asian clams and overbite clams.

The non-native mussels also could kill native mussels in the estuary.

Longfin smelt have suffered major declines in the San Francisco Bay estuary.

On a sunny day in October, angler Jay Lewis was enjoying the peaceful views over the Severn Estuary on Penarth Pier in the Vale of Glamorgan, south Wales.

Longfin smelt have suffered major declines in the San Francisco Bay estuary.