Send us your pictures of pond life

With reports that British garden ponds are unwittingly being polluted by people topping them up with tap water , a new public water survey starting this Wednesday couldn't be more timely. The Open Air Laboratories (Opal) water survey organised by Pond Conservation, the Natural History Museum and University College London, hopes to use public records to produce a more detailed picture of the levels of pollution in British ponds, lakes and rivers. To mark the survey, we're collecting the best photos of water boatmen, beetles, snails, alderflies, frogspawn, damselfly larvae and other pond wildlife. Just add your photos to our pond life Flickr group . We'll feature some of our favourites here on environmentguardian.co.uk and maybe in the newspaper version of the Guardian as well. By posting your pictures in this group you agree to let this happen (though copyright remains with you at all times).