Famous more as a cultural feature than as a natural one, the pace at which the River Mersey is recovering to a fishy wonderland has ecologists stunned.

Splitting The Beatles' home city of Liverpool in two, a recent survey found 37 different species of fish, more than two-and-a-half-times as many as were found in the previous survey 20 years ago.

Five different species of sharks were also found, along with huge eels and sea scorpions. ‘Holiday species' as one local fishermen called them, like turbot, smelt, and cod, have also been caught.

Scientists at the Mersey Rivers Trust, a public/private charity-driven partnership for nature in the area believe that these species are breeding in the 3 mile-wide estuary.

The Liverpool Docks-the largest enclosed dock system in the world, were described by Herman Melville as comparable to the Pyramids in size and construction.

As a result, industrialization heavily polluted the river. In 2009 however it was announced that the river was "cleaner than at any time since the industrial revolution" and is "now considered one of the cleanest [rivers] in the UK."

"Over the last 30 years, there's been this tremendous regeneration, this renewal of the River Mersey that started slowly but is now picking up pace. I still think we're right at the beginning of something special," said Mike Duddy at the Mersey Rivers Trust, who spoke to the Wirral Globe about the restoration. 

"It's the best environmental good news story in Europe without a doubt," adds Duddy. "Everywhere else nature is in decline but in the Mersey the ‘wildlife-ometer' is in the red and it's got loads and loads to go… David Attenborough talks about an environmental crisis but the Mersey is not."

Humpback whales were recently seen in Liverpool Bay for the first time since 1938, while the Mersey itself has also welcomed back otters, salmon, octopus, porpoises, and seals.

The Trust is currently compiling a species list, and is holding a competition with local fishermen to see how many can be recorded. Duddy expects to raise the count of 37 fish species to 50 next year.

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