Technical Report
 

Pigment alteration as a method of permanently marking Dungeness crabs (Cancer magister) and other crustaceans

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https://ir.library.oregonstate.edu/concern/technical_reports/db78tc808

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  • The technique of freeze branding was developed by Dr. R. K. Farrell during the 1960’s as an alternative to fire branding domestic livestock. Today, freeze branding is internationally used for cattle and horse ident­ification. In addition to many species of haired animals successfully freeze branded non-haired animals such as whales, fish and snakes have been marked using the same concepts developed for marking haired animals. Freeze brands were maintained on rattlesnakes and gopher snakes through numerous sheds of the skin. (unpublished data - Stroud) It was this success with snakes that prompted the initial investigation into the pos­sibility of freeze branding crustaceans with the hope that the depigmentation caused by the process would be reproduced in each new exoskeleton. The need for a method of marking crabs, shrimp and lobsters for fisheries research and management is well documented. The marking techniques current­ly available are not wholly satisfactory. A good marking technique should produce an identifiable mark that will remain throughout the life of the animal will not interfere with the act of molting, will not cause a differential mortality in marked animals by increasing susceptibility to pred­ation of disease, is inexpensive and adaptable to field procedures, and is easily recovered or recognized in commercial or sport harvests.
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file details PigmentAlterationMethod.pdf 2017-07-11 Public Download