
Between 1860 and 1960 the river Thames was reduced to sewer status. Deprived of oxygen due to shit eating bacteria, the river's London reaches formed an impassable barrier to fish.
The government declared the Thames biologically dead in the 1950s and various groups have worked to rehabilitate it since then.
London's sewage-treatment facilities have been enlarged and improved, which is the major reason why the river has been cleaned up.
Seals, dolphins, salmon, pike and sea lampreys can now be seen swimming in the healthier river.

Last April short snouted sea horses were found in the Thames, which was remarkable, but these latest finds defy belief.
Last week three mermaids were caught and photographed by anglers on the south bank, opposite the houses of parliament. In the true spirit of conservationism they were thrown back in.
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