Abstract: A device for simultaneously holding and measuring the length of a fish, generally comprising a rectangular tray open at one end, the tray having a bottom, two side walls and one end wall, and a preferably hinged lid with a releasable latch. The length of the tray is made equal to the minimum legal length established for the type of fish with which the device is to be used. The length of the lid is less than the length of the bottom of the tray and the lid is disposed on the tray with one end of the lid generally aligned with the closed end of the tray, such that a portion of the bottom of the tray adjacent to the open end is not covered by the lid. A fish is placed in the device with its nose against the end wall at the closed end of the tray, and the lid is closed to loosely retain the fish the device. If the tail of the fish extends outwardly beyond the open end of the tray the fish is of legal size and may be retained by the fisherman.