Common Frog Declining Populations and Pond Restoration

Common frogs have declined significantly across the UK despite remaining common in some areas. Pond loss and disease threaten welfare and populations simultaneously.

Key Facts

Common frog populations have declined in some UK regions by up to 50% since the 1970s
Ranavirus disease causes mass mortality events in garden pond populations
Ponds are the most biodiverse freshwater habitat and have declined by 70% since 1900
Garden ponds now support a significant proportion of UK amphibian breeding populations
Frogs should never be moved between ponds due to disease transmission risk

Welfare Considerations

Ranavirus infection causes haemorrhagic disease in common frogs with high population-level mortality in localised outbreaks. Individual frogs show skin ulceration, limb abnormalities and haemorrhaging before death. No treatment is available and affected pond populations may be eliminated within days of an outbreak. Disease spread by translocation — well-intentioned movement of spawn, tadpoles or frogs between ponds — is the primary driver of ranavirus dissemination. Creating new ponds and managing existing ones for amphibian habitat is the most effective welfare intervention at scale.

What You Can Do

Create a garden pond with sloping edges, native plants and no fish
Never move spawn, tadpoles or frogs from one pond to another
Report dead frog events during the breeding season to the Garden Wildlife Health Scheme
Remove garden chemicals and pesticides that contaminate pond habitats
Register your pond with Pond Conservation to contribute to national monitoring