Coles shareholders have backed the supermarket giant's approach to salmon farming but not before executives caught an earful from activists defending an endangered prehistoric fish.

A Queensland teenager was among the conservationists who queried the company's approach to sourcing salmon from Tasmania's Macquarie Harbour at the grocery giant's annual general meeting on Tuesday.

Coles leaders batted away questions on its fish supplies despite delivering a series of strong sales results as it gained ground on arch rival Woolworths.

Spencer Hitchen, 14, told executives and shareholders he could not comprehend how the adults could further threaten already-endangered species.

"Are you willing to knowingly extinct the Maugean skate and do you care about my generation's future?" he asked.

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