Genetic identification of threatened shark species in pet food and beauty care products
Contemporary global demand for shark commodities such as fins, meat, and liver oil, is arguably the main driver of shark overexploitation trends observed in the last three decades. Shark are most commonly traded for their fins to be used in different Asian countries as a soup delicacy. Nevertheless, shark meat trade has increased substantially in the last decade, while liver oil trade is still largely unknown. Shark liver oil is highly valuable in the cosmetic industry as a moisturizer, while shark meat is directly consumed in a large number of countries but the whole extent of its uses is unknown. Here I used a multiplex mini-barcode PCR protocol to identify traces of shark DNA in beauty care and pet food products, in order to identify them to the genus and/or species level. All products tested for this study were not labeled as containing elasmobranch-based ingredients. I tested 87 pet food products, 63% amplified successfully, and 70% of those were identified as the Endangered shortfin mako shark. I also tested twenty-four cosmetics, where 3 (12.5%) amplified successfully, containing blue shark, scalloped hammerhead and blacktip shark. This study highlights the need for more labeling controls, since shark populations could benefit if consumers have the alternative to choose whether or not to purchase products containing threatened shark species in order to decrease the global demand.
KeywordsFood mislabeling Isurus oxyrinchus Pet food Squalene Shark conservation
I would like to thank the Sharkwater Team for their generous contribution to this study. This manuscript is dedicated to the memory of Rob Stewart, a passionate and dedicated individual who inspired people to protect and speak up for sharks and the oceans.
- Berkeley SA, Campos WL (1988) Relative abundance and fishery potential of pelagic sharks along Florida’s east coast. Mar Fish Rev 50:9–16Google Scholar
- Buencuerpo V, Rios S, Morón J (1998) Pelagic sharks associated with the swordfish, Xiphias gladius, fishery in the eastern North Atlantic Ocean and the Strait of Gibraltar. Fish Bull 96:667–685Google Scholar
- Clarke S, Sato M, Small C, et al (2014) Bycatch in longline fisheries for tuna and tuna- like species: a global review of status and mitigation measures. FAO Fisheries Technical Paper No 341, Rome, pp 1–236Google Scholar
- Cortés E (2002) Catches and catch rates of pelagic sharks from the northwestern Atlantic, Gulf of Mexico, and Caribbean. ICCAT Coll Vol Sci Pap 54:1164–1181Google Scholar
- Dent F, Clarke S (2015) State of the global market for shark products. FAO Fisheries and Aquaculture Technical Paper No. 590. FAO, RomeGoogle Scholar
- FAO (2001) Codex general standard for the labelling of prepackaged foods, in Codex Stan 1985 (Rev. 1-1991), pp 1–62. http://www.fao.org/docrep/005/Y2770E/y2770e02.htm. Accessed 24 May 2007
- FAO (2016) The state of world fisheries and aquaculture 2016. Contributing to food security and nutrition for all. Rome, pp 1–204Google Scholar
- Nakano H, Honma M (1997) Historical CPUE of pelagic sharks caught by the Japanese longline fishery in the Atlantic Ocean. Col Vol Sci Pap ICCAT 46:393–398Google Scholar
- Ruiz-Valdepeñas Montiel V, Gutiérrez ML, Torrente-Rodríguez RM et al (2017) Disposable amperometric polymerase chain reaction-free biosensor for direct detection of adulteration with horsemeat in raw lysates targeting mitochondrial DNA. Anal Chem 89:9474–9482. https://doi.org/10.1021/acs.analchem.7b02412 CrossRefGoogle Scholar
- Simpfendorfer C, Cortés E, Heupel M, et al (2008) An integrated approach to determining the risk of overexploitation for data-poor pelagic Atlantic sharksGoogle Scholar
- Wu J (2016) Shark fin and mobulid ray gill plate trade. TRAFFIC Report, pp 1–94Google Scholar