Every year in November the weir at Richmond Lock is lifted to allow a portion of the river to drain naturally at low tide. Here at ZSL we use this opportunity to scout the river bed for any species that are not native to this country's waterways. This survey work has been carried out since 2007, and will continue in the long term, to feed into a London Invasive Species Initiative (LISI) [link]. This will soon also include an eDNA project that will allow us to more accurately understand the biology of the invasive species we find.
Invasive species such as painted mussel, zebra mussel and asian clam
Steve Mowat is in the steering group for the London Invasive Species Initiative (LISI).