Sealord says it will stop selling tuna caught with the use of destructive fishing method from next year.
The fishing company buys most of its tuna from boats using nets based around fish agregating devices (FADs). The floating lures attract tuna but also sharks, turtles and other fish.
Sealord says it is following the advice of research on ensuring the lowest possible bycatch.
The company's general manager in New Zealand, Stu Yorston, says data shows the bycatch is more than 1% higher using FADs compared to other methods.
Greenpeace has been campaigning for the past two years for tuna companies operating in New Zealand to stop the practice.
Oceans spokesperson Karli Thomas says UK and Australian tuna brands have already made the same committment and Sealord's announcement is great news.