The AONB Estuaries Partnership has produced the following biosecurity plan to help stop the spread of marine non-native species around the South Hams.
The risks of an invasive non-native species in the Avon Estuary are relatively low owing to the regular flushing of the estuary by freshwater but with increases in the number of people and craft using the estuary for recreational purposes, the danger is still present. Please be vigilant and take any relevant precautions, as advised in the plan.
The effects of invasion by Spartina or cord grass in the Avon Estuary after artificial introduction by Man are all too evident in the steady accumulation of silt and mud. Multiplication of the Pacific Oyster outside of the farmed racks in our estuary is prevented by limiting the externally-sourced juveniles to triploid (infertile) individuals.