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Over the past few years, there has been concern expressed over the spreading of Red Leg Disease throughout the country. Red leg disease may be caused by bacteria (Aeromonas hydrophila) which are already present amongst frog populations. It seems that the disease only breaks out if the frogs are under some stress, perhaps overcrowding. In fact, research is still going on into the condition and it may be that more than one factor is involved.
The name red leg comes from the lesions found on the hind legs and underneath of the frog giving the legs a red appearance. This infection is highly contagious among frogs and will kill all the frogs in a pond. All affected frogs should be taken to your nearest wildlife rescue centre as soon as possible. Clearing and emptying the pond may provide some protection.
The following is from The House of Commons web site publications
58. DEFRA are also using a slightly different
approach by targeting the source of some of the non-native species of both flora and fauna that are flourishing so rapidly in gardens
across the country. An example of this may be the deadly Red Leg virus which is decimating native common frog populations. Many experts
believe that the massive increase in this disease has brought the common frog to the brink of extinction and as frogs are an essential
part of the food chain for predators such as foxes, stoats and buzzards, the impact will be felt more widely. Whilst it is still not
clear how Red Leg entered Britain, one theory is that it was brought in by tropical fish or other amphibians bred for garden centres
which are then introduced to garden ponds. DEFRA are in the process of developing a Code of Practice for the horticultural sector
and have formed a working group, which includes representatives form other Government departments as well as, for example, the Royal
Horticultural Society and the Garden Centres Association, to take this work forward. We understand that the thrust of this Code of
Practice will be to educate those involved in the horticultural sector about, effectively, doing the right thing rather than warning
against doing anything illegal. We urge DEFRA to ensure that the Code of Practice for the horticultural sector is not simply an information
leaflet to be ignored but that it has some requirement for compliance built into it which is then backed up by a proper monitoring
process.
This causes more harm than good. The experts say it should not be moved under any circumstances as it may introduce red leg, and devastate another population. In general, things should not be returned to the wild, e.g. from garden pond to any natural water body.