My understanding is that, for most of the recent past, May 1 has been an adequate start to enable the weir fishery to take place. Because of the ice in the river, the fish don't come before that period. In fact, capelin are fished in other parts of their habitat far later in May or even in June. If we were to move this date forward to April 1, my understanding is that most years the two weir fishers would still not be able to start any earlier than they have been historically on May 1. It does mean that, if there should be an unusually warm year when the ice has melted sooner, they would be able to go out and do their weir fishery before May 1 and after April 1.
On April 13th, 2022. See this statement in context.