Talley's Group, which has extensive fishing interests' />

The South Island's Talley family has boosted its stake in Affco Holdings to 78.2 per cent.

Talley's Group, which has extensive fishing interests, on Thursday extended its 37c a share offer for the meat company to September 20.

The stake was disclosed in a substantial shareholder notice to NZX yesterday.

In October 2001 Talley's bought 10 per cent of Affco, which was founded in 1904 as the Auckland Farmers' Freezing Co-operative.

In 2006 it boosted its stake to over 50 per cent.