Billionaire Andrew Forrest has intensified his campaign against the takeover of salmon farmer Huon Aquaculture by Brazilian agribusiness giant JBS, demanding that the latter commit to higher animal welfare standards and questioning its history of bribery and corruption.

Dr Forrest, whose private firm Tattarang has an 18.5 per cent stake in Huon, had been in a position to block the deal when it was proposed to be completed via a scheme of arrangement, which required 75 per cent shareholder approval.