1. A method for estimating a total weight of a fish catch, comprising: capturing images of a fish catch; the fish catch having been received on a fishing vessel; wherein capturing images of the fish catch comprises: capturing a first image from a first camera; and simultaneously capturing a second image from a second camera; identifying fishes in the images; applying stereo-photogrammetry to obtain characteristics of each fish from the fishes; the first camera and the second camera being configured such that stereo-photogrammetry can be applied; identifying, using the characteristics, for each of the fishes, a species to which a corresponding fish belongs; determining, from the images, lengths of fishes that are a part of the fish catch; determining, from the images, a volume occupied by the fish catch; and estimating the total weight of the fish catch based on the lengths of fishes and the volume occupied by the fish catch.