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Australia's tuna industry says climate change could be increasing the size of the fish.

The chief executive of the Australian Southern Bluefin Tuna Association, Brian Jeffriess, says this year has been excellent for quality and fish size.

Mr Jeffries says this can be partly attributed to climate change and its effect on feed species, such as sardines, in the Great Australian Bight.

For example, this year some of the oceanographers are saying they've never seen south easterly winds in a sustained strong way now that creates a lot of upwellings in the water, that brings nutrients to the surface," he said.

"There's a feed chain which feeds on those - the tuna is virtually the last part of that food chain and benefits from improvements in the other parts of the food chain." ABC