A free program for Android, by ITJapan.

Fish measurement is an application for smartphones and tablets that allows you to measure the length, weight, and appearance of fish, as well as the size of other aquatic animals, using a digital scale and camera. It also allows you to set a list of standard measurements, so that you can easily compare your results with those standards. This app can be used as a reference for future measurements.

The application is designed to be used with a smartphone or tablet, and it is compatible with both Android and iOS devices. You can use the application in either English or Japanese.