Are concentrations of pollutants in sharks, rays and skates (Elasmobranchii) a cause for concern? A systematic review

Tiktak, Guuske P.; Butcher, Demi; Lawrence, Peter J.; Norrey, John; Bradley, L. R.; Shaw, Kirsty J.; Preziosi, Richard F.; Megson, David

doi:10.1016/j.marpolbul.2020.111701

Cited by 86 publications

(44 citation statements)

References 133 publications

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“…www.nature.com/scientificreports/ high metal concentrations at other Bahamian locales (e.g., South Eleuthera 52 ). For THg, the remarkably high concentrations reported here exceed those in nearly all other marine animals 17,53 , which may be ascribed in part to diet 54,55 but also to ambient oceanographic conditions specific to sub-tropical waters such as high ocean temperatures (which increase methylation rates of inorganic Hg by marine microbes 56 ). This may explain the higher THg concentrations in less mobile sharks either known or assumed to display high residency within Bahamian waters (e.g., Caribbean reef sharks 36 ; blacknose sharks and nurse sharks), relative to more transient species that move throughout much of the northern Western Atlantic ocean, such as tiger sharks 33,34 .…”

Section: Discussionmentioning

confidence: 57%

Metal concentrations in coastal sharks from The Bahamas with a focus on the Caribbean Reef shark

Shipley

Lee

Fisher

et al. 2021

Sci Rep

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Over the last century anthropogenic activities have rapidly increased the influx of metals and metalloids entering the marine environment, which can bioaccumulate and biomagnify in marine top consumers. This may elicit sublethal effects on target organisms, having broad implications for human seafood consumers. We provide the first assessment of metal (Cd, Pb, Cr, Mn, Co, Cu, Zn, As, Ag, and THg) and metalloid (As) concentrations in the muscle tissue of coastal sharks from The Bahamas. A total of 36 individual sharks from six species were evaluated, spanning two regions/study areas, with a focus on the Caribbean reef shark (Carcharhinus perezi), and to a lesser extent the tiger shark (Galeocerdo cuvier). This is due their high relative abundance and ecological significance throughout coastal Bahamian and regional ecosystems. Caribbean reef sharks exhibited some of the highest metal concentrations compared to five other species, and peaks in the concentrations of Pb, Cr, Cu were observed as individuals reached sexual maturity. Observations were attributed to foraging on larger, more piscivorous prey, high longevity, as well a potential slowing rate of growth. We observed correlations between some metals, which are challenging to interpret but may be attributed to trophic level and ambient metal conditions. Our results provide the first account of metal concentrations in Bahamian sharks, suggesting individuals exhibit high concentrations which may potentially cause sublethal effects. Finally, these findings underscore the potential toxicity of shark meat and have significant implications for human consumers.

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Section: Discussionmentioning

confidence: 57%

Metal concentrations in coastal sharks from The Bahamas with a focus on the Caribbean Reef shark

Shipley

Lee

Fisher

et al. 2021

Sci Rep

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“…The consumption of this dish and other shark products offers a potential pathway that can expose humans to elevated levels of mercury. Studies show that children and adults who consume shark products once a week are exposed to three times more mercury than what is recommended by the United States Environmental Protection Agency (U.S. EPA) [ 24 ]. While the majority of studies generally report mercury and levels of other toxic elements in muscle tissue, the liver or from vertebrae where they readily accumulate [ 20 , 24 , 25 ], it is important to note that fins can contain higher levels of mercury and other toxic elements, such as lead and cadmium, in comparison to muscle and other non-fin tissues [ 23 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

What Is in Your Shark Fin Soup? Probably an Endangered Shark Species and a Bit of Mercury

Choy¹,

Wainwright

2022

Animals

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Shark fin soup, consumed by Asian communities throughout the world, is one of the principal drivers of the demand of shark fins. This near USD 1 billion global industry has contributed to a shark population declines of up to 70%. In an effort to arrest these declines, the trade in several species of sharks is regulated under the auspices of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Despite this legal framework, the dried fins of trade-regulated sharks are frequently sold in markets and consumed in shark fin soup. Shark fins found in soups break down into a fibrous mass of ceratotrichia, meaning that identifying the species of sharks in the soup becomes impossible by visual methods. In this paper, we use DNA barcoding to identify the species of sharks found in bowls of shark fin soup collected in Singapore. The most common species identified in our samples was the blue shark (Prionace glauca), a species listed as Near Threatened on the International Union for Conservation of Nature (IUCN) Red List with a decreasing population, on which scientific data suggests catch limits should be imposed. We identified four other shark species that are listed on CITES Appendix II, and in total ten species that are assessed as Critically Endangered, Endangered or Vulnerable under the IUCN Red List of Threatened Species. Globally, the blue shark has been shown to contain levels of mercury that frequently exceed safe dose limits. Given the prevalence of this species in the examined soups and the global nature of the fin trade, it is extremely likely that consumers of shark fin soup will be exposed to unsafe levels of this neurotoxin.

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“…Hiu dan pari merupakan anggota dari subkelas Elasmobranchii (Dulvy et al 2014;Dharmadi & Satria 2015;SEAFDEC 2017;Hara et al 2018;D'Alberto et al 2019;Bernardo et al 2020), dimana Elasmobranchii mencakup sekelompok besar ikan karnivora dan detritivora yang tersebar di seluruh dunia, mulai dari perairan dangkal hingga kedalaman abisal (Tuya et al 2020). Selain itu, hiu dan pari juga tergolong sebagai anggota kelas Chondrichthyes (Bhat et al 2018;Seidel et al 2020;Jambura et al 2020;Herraiz et al 2020;Sternes & Shimada 2020) yaitu ikan bertulang rawan dari salah satu garis keturunan vertebrata tertua yang paling beragam secara ekologisnya dan muncul lebih dari 420 juta tahun yang lalu (Tiktak et al 2020). Menurut Heithaus et al (2008) dan Ferretti et al (2010) hiu dianggap memainkan peran penting dalam penataan jaring-jaring makanan di laut.…”

Section: Pendahuluanunclassified

Biodiversitas dan Status Konservasi Hiu dan Pari di Pelabuhan Perikanan Lampulo Banda Aceh

Isma¹,

Imamshadiqin²,

Erlangga³

et al. 2021

JBI

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Identification, monitoring of the composition and wealth of species is indispensable in formulating management of fish resources, one of which is sharks and rays. The purpose of this study was conducted to determine the diversity of types, composition, long distribution, and conservation status of sharks and rays landed in PPS Lampulo Banda Aceh. The research was conducted in July 2020. Shark and stingray samples used are captured from the waters of the Indian Ocean and the Straits of Malacca with morphometric measurements of their total length performed on each grounded sample. The results of the study identified as many as 17 species for sharks and rays, where sharks consist of 9 families and rays consist of 7 families, then the conservation status of sharks and rays landed in PPS Lampulo Banda Aceh is classified as critical (sharks 1 species and rays 1 species), threatened (sharks 2 species and stingrays 4 species), vulnerable (sharks 7 species and stingrays 4 species) and almost threatened (sharks 5 species and stingrays 2 species). In addition, the conservation status of landed sharks is also classified as low risk (2 species), while stingrays are also inadequate information (2 species) and have not been evaluated (4 species) by the IUCN. Furthermore, the dominant composition of sharks landed are species L. macrorhinus and A. pelagicus (21.43%), C. punctatum (11.90%), and H. microstoma (08.33%), while the dominant composition of stingrays was R. australiae (23.19%), N. kuhlii (17.39%) and H. jenkinsii (13.04%), which based on the distribution of the total length of sharks and rays that are predominantly caught in the Indian Ocean and the Straits of Melaka is classified as immature.

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Are concentrations of pollutants in sharks, rays and skates (Elasmobranchii) a cause for concern? A systematic review

Abstract: 2020) Are concentrations of pollutants in sharks, rays and skates (Elasmobranchii) a cause for concern? A systematic review. Marine Pollution Bulletin, 160. p. 111701.

Cited by 86 publications

References 133 publications

Metal concentrations in coastal sharks from The Bahamas with a focus on the Caribbean Reef shark

Metal concentrations in coastal sharks from The Bahamas with a focus on the Caribbean Reef shark

What Is in Your Shark Fin Soup? Probably an Endangered Shark Species and a Bit of Mercury

Biodiversitas dan Status Konservasi Hiu dan Pari di Pelabuhan Perikanan Lampulo Banda Aceh

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