He said the proposed site would cut off the otters' "corridors" between their territories.
Two baby otters born at Chester Zoo have been named after British Olympic medal hopefuls.
Since July 1988 at least 300 otters have been run over in England and Wales.
Normally, they are terribly skittish, otters, but this fellow was languorous as a surfer.
Sometimes the answer is fencing, a remedy which is also used to keep otters out of fisheries.
Rescue teams managed to rehabilitate 300 sea otters and return them to the wild after the spill.
"The Otters and Rivers Project will bring otters back into Britain's waterways, where they belong, " Mr Duckworth said.
Skybus already has three of the 19-seater Twin Otters in its fleet, plus three eight-seater Britten Norman Islanders.
We even put the phone at the bottom of a dish of ice for him (otters love ice, apparently).
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But sea otters are not the only creatures that live in the slough.
Asian short-clawed otters - the world's smallest otter species - are classed by conservation organisations as vulnerable to extinction.
He said if he had told him that otters were re-colonising the river he could have installed protective fencing.
Otters have also been recorded in the centre of major towns and cities, including Birmingham, Glasgow, Newcastle-upon-Tyne and Doncaster.
Wildlife ranging from seabirds and sea otters to whales and bald eagles were covered and killed by the oil.
Though the otters look perky, many carry traces of oil in their livers.
The holts are part of the Otters and Rivers Project, a joint initiative by Water UK and the Wildlife Trust.
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The two Asian short-clawed otters were named Daley, after diver Tom Daley, and Rebecca, in honour of swimmer Rebecca Adlington.
Once outside, he aimed not for the tide-line rocks, where the otters all lived, but for the higher ground, south.
After a ban on otter hunting and new legal protection in 1978, otters have become an important conservation success story.
And as fish stock increases, so too will wildlife connected to the river system, including otters, water voles and bird life.
The charity believes the wet weather may be responsible for displacing young otters whose holts (dens) have been flooded or disturbed.
In the wild giant otters are found in remote areas within some freshwater lakes, rivers, creeks, and reservoirs of tropical South America.
Today, there are established centers at marine mammal facilities to de-oil otters.
"Light, sound and human presence will force otters, that would otherwise move up and down the river, on to the road, " he added.
His legal action is being regarded as a landmark case for fishery owners across the country who have had similar issues with otters.
Two baby giant otters - the first to be born at Chester Zoo's new breeding centre - have made their first public appearance.
Otters spend most of the day resting in burrows, known as holts, which are built from sticks and branches along the water's edge.
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Mr Brown said that Mr Dodson had never approached the agency for advice about how to deal with otters despite information being available.
He also claimed that when he established the fish farm local people told him that the River Cegin had no otters living in it.
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