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Yesterday, chairman Jim Bolger announced Sir William English had been appointed effective from the start of August.
Sir William's recent retirement from politics gave him the opportunity to apply his talents to help a fast-growing company such as Mount Cook Alpine Salmon realise its potential, Mr Bolger said in a statement.
Sir William said he was looking forward to joining a southern company producing a ''world class'' product that was doing very well in high-value export markets.
The company has salmon farms in Twizel and Tekapo.