Farmed ballan wrasse have been introduced to a Scottish salmon farm for the first time.

BBC: Western Isles salmon farm in wrasse 'first'

He said species he would normally expect to have returned, such as wrasse, pouting and spider crabs, have not appeared.

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Things started to make sense and as I swam along the steel plates I joined large schools of wrasse, pollock and pouting.

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Research into the use of wrasse was launched in 2008 and later co-opted into the Ecofish project, an initiative financed through the European Regional Development Fund and backed by state grants and private funding.

BBC: Western Isles salmon farm in wrasse 'first'