You're only allowed to catch two salmon a trip.
Hundreds of thousands of salmon swim up the Columbia River this time of year.
Fishermen try to take advantage of it.
But authorities say a lot of them also snag fish that are endangered.
Wildlife officials worry other species will take a hit.
One wildlife employee says he's never seen these type of restrictions in his 30 years on the job.
The new rules will last through the end of the month.