Slender stonewort  (Nitella gracilis)

The threats facing this species at present are poorly understood, however pollution from agricultural run-off, and the growth of scrub and other vegetation are thought to be important factors that adversely affect this species. Fish-farming would be a cause for concern if it were proposed at sites supporting the species.

Slender stonewort is a priority species under the UK Biodiversity Action Plan (UK BAP). The Species Action Plan for this stonewort aims to maintain current populations, and to reintroduce the species to one site within the former range before 2005. It is clear that more must be learnt of this plant in order to conserve it effectively and diving surveys of the historic sites must be made in order to determine the current range of the species.