Went here yesterday - Wednesday, April 1, 2015 - at 6:15 p.m. and the doors were locked with no courtesy sign indicating why they had to close early (weekday hours are until 6:30 p.m.). Another potential customer tried to go in after me and looked just as perplexed.
Real fishy.
Still giving three stars because I've been here before and the fish is very fresh and service is fast, though not always friendly.