The Tidal Thames was declared biologically dead in 1957 with zero fish species, and over 115 have been recorded since, ZSL’s 2026 report says, though species per sample have slipped since 1992.
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The Tidal Thames was declared biologically dead in 1957 with zero fish species, and over 115 species have been recorded in it since, according to The State of the Thames 2nd Edition, a report from the Zoological Society of London (ZSL).
ZSL published the report on 19 January 2026, five years after the first edition, its project page says. The Tidal Thames is the stretch of river that rises and falls with the tide, from Teddington through London to the sea.
Why, then, has the average number of sp
ZSL published the report on 19 January 2026, five years after the first edition, its project page says. The Tidal Thames is the stretch of river that rises and falls with the tide, from Teddington through London to the sea.
Why, then, has the average number of sp
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