Embodiments of the present invention seek to provide an accurate way to measure the length of a fish. Some embodiments of the present invention propose utilizing a known length of a marker within a camera view or picture to determine the length of the fish also shown in the same camera view or picture. This determination could be performed in real-time or later remotely. Further, the measurement of the length of the fish is reliable because it is not dependent on a zoom value or angle of the camera and there is no required measurement device. Further, the technique is easy to use and can be performed with a camera phone or tablet.