An apparatus for producing ventral images of aquatic organisms, such as amphibians, for example, of newts the apparatus comprising a hollow conduct and a watertight container. The hollow conduct has a first opening and a second opening being opposed from each other. The hollow conduct and the watertight container are separated by a wall which transmits the wavelengths comprised between 390 nm and 1.4 μm. The apparatus is opaque to the wavelengths comprised between 390 nm and 1.4 μm. The watertight container comprises an underwater video camera oriented towards the wall. The apparatus is remarkable in that the watertight container is positioned below the hollow conduct, the watertight container being filled with clean water. Additionally, a method for detecting, identifying and/or individualizing aquatic animals.