This methods can also be used to separate two or more bigger groups of fish. Tattooing - Panjet, chemical marks. Tattoeing by injection of coloured fluids can be used to separate groups of fish, i.e. to identify migration time of fish in rivers. Relatively short durability and applicability is species dependant. Different patterns can be used to separate groups.
Durability is species dependant but is applicable for short-term experiments.
Used in aquaculture to identify individual male and females in broodstock and reported in some species to be visible for several years. Complicated patterns may become difficult to read after a certain time period due to partial regeneration. Hot branding is applied by pressing a hot metal bar of a certain shape against the fish. Less effective than cold branding and presumably with shorter durability. Laser this section is not complete Applications.