A Whanganui East resident found one living freshwater mussel as he pulled smelly plastic bags and other rubbish out of the Matarawa Stream.
Larn Sweeney has lived in his Raine St house for four years. Having the Matarawa Stream run through its back garden was one of its good points.
But he has pulled three trailer-loads of rubbish out of the stream so far and is now finding a layer of plastic bags submerged in the mud in its bed. That would make it a very tough place for the sole remaining freshwater mussel (kākahi) he found.
Kākahi used to be common in the soft, sandy sediment of New Zealand streams, lakes and rivers. They burrow into soft sediment and filter water - having a major cleaning effect where they are found in good numbers.
They're under threat and declining, perhaps partly because they start their lives as parasites attached to kōaro, a native fish. Kōaro are one of the whitebait species, and also in decline.