Police in the Canadian province of Nova Scotia have made two arrests as tensions rise over a lobster fishery set up by the indigenous community.
Officers detained two people for assault as crowds gathered to mark the launch.
Members of the Sipekne'katik First Nation say they have a right to issue fishing licences to their own people.
Non-indigenous lobster fishers, however, say their boats are operating out of season and should be stopped.
The row comes on the anniversary of a ruling that affirmed the rights of indigenous groups to hunt and fish.
That 1999 ruling stipulated that any hunting and fishing should be for a moderate livelihood - but "moderate" remains largely undefined.
Lobster is Nova Scotia's most valuable seafood export and the associated fishing industry is worth an estimated C$500m (£293m) annually.