Hawaii is banning large-scale commercial harvesting of sea cucumbers with a law that takes effect Jan. 10.

Gov. David Ige signed the measure Thursday. Licensed aquarium collectors will be allowed to harvest two species of sea cucumbers, but only from Oahu waters. They will be limited to 20 per day and the entire commercial fishery is allowed an annual harvest of no more than 3,600.

The Hawaii Board of Land and Natural Resources approved the new rules Dec. 11.

Land officials in June approved a temporary ban on possessing sea cucumbers following mass harvests. This marked the state’s first regulation for sea cucumber harvesting.

Ige says the new limits are intended to protect and sustain populations of sea cucumbers near Hawaii’s shores.