Total Mercury in Liver and Muscle Tissue of Two Coastal Sharks from the Northwest of Mexico

Hurtado-Banda, Rocío; Gómez-Álvarez, Agustín; Márquez‐Farías, J. Fernando; Cordoba-Figueroa, Marcial; Navarro-García, Gerardo; Medina-Juárez, Luis Ángel

doi:10.1007/s00128-012-0623-x

Cited by 27 publications

(8 citation statements)

References 11 publications

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“…This finding is well illustrated by the strong associations between body length and muscle Hg concentrations that have been observed for several shark species (Turoczy et al 2000;Gelsleichter and Walker 2010;Storelli et al 2011;Hurtado-Banda et al 2012;Maz-Courrau et al 2012;Delshad et al 2012). In the current study, although all scalloped hammerhead sharks were juvenile with relatively low variation in body size, significant correlations were found between total length and weight and Hg concentration in muscle and liver, but it was found that Hg in muscle increased and Hg in liver decreased as total length and weight incremented.…”

Section: Discussionsupporting

confidence: 57%

“…The scalloped hammerhead shark S. lewini makes an important contribution to Mexican fisheries along the Gulf of California (Bizarro et al 2009) and is highly consumed by the local population, because it is abundant and inexpensive (Cartamil et al 2011;Hurtado-Banda et al 2012). The organisms that occupy high trophic positions in marine ecosystems, such as tuna, billfishes, and sharks, are particularly exposed to toxic elements like Hg through food intake (Kojadinovic et al 2007;Damiano et al 2011;McMeans et al 2015).…”

mentioning

confidence: 98%

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Mercury and Selenium in Muscle and Target Organs of Scalloped Hammerhead Sharks Sphyrna lewini of the SE Gulf of California: Dietary Intake, Molar Ratios, Loads, and Human Health Risks

Bergés-Tiznado

Márquez-Farías

Lara‐Mendoza

et al. 2015

Arch Environ Contam Toxicol

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Selenium and mercury were evaluated in muscle, liver, kidney, brain, and the stomach contents of juvenile scalloped hammerhead shark Sphyrna lewini. Se:Hg molar ratios were calculated. The average Hg levels in muscle ranged from 0.12 to 1.17 μg/g (wet weight); Hg was <0.39 μg/g in liver and kidneys and <0.19 μg/g in brain. The lowest value of Se was found in muscle (0.4 μg/g) and the highest in kidney (26.7 μg/g). An excess of Se over Hg was found, with Se:Hg molar ratios >1. Correlations were found for Hg in muscle with size, age, and weight, and also for Hg in liver with size, age, and weight. Hg in muscle was significantly positive correlated to Hg in brain as well as Hg in liver was correlated to Hg in kidney. The highest Hg in preys was for carangid fishes; scombrid and carangid fishes contributed with the highest Se levels. Results suggest that more than 98 % of the total Hg and 62 % of Se end up in muscle and might be affected by factors, such as geographical area, age, size, and feeding habits. The muscle of S. lewini should be consumed by people cautiously so as not to exceed the recommended intake per week.

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Section: Discussionsupporting

confidence: 57%

mentioning

confidence: 98%

Mercury and Selenium in Muscle and Target Organs of Scalloped Hammerhead Sharks Sphyrna lewini of the SE Gulf of California: Dietary Intake, Molar Ratios, Loads, and Human Health Risks

Bergés-Tiznado

Márquez-Farías

Lara‐Mendoza

et al. 2015

Arch Environ Contam Toxicol

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“…Concerning sex, no differences between Hg concentrations for both muscle and liver were observed between male and female juveniles from either Cabo Frio or Rio das Ostras, corroborating literature assessments of Hg concentrations for other Rhizoprionodon members (R. acutus) from South Africa (McKinney et al, 2016) and the Persian Gulf (Adel et al, 2017), as well as other sharks, such as the blue shark Prionace glauca and shortfin mako Isurus oxyrinchus, sampled from the NE Atlantic (Biton-Porsmoguer et al, 2018), and nine shark species sampled from the Florida Coast (Hueter et al, 1995). Thus, juvenile males and females were assessed together per location in further statistical analyses.…”

Section: Biometric Sharpnose Shark Datasupporting

confidence: 80%

Mercury screening in highly consumed sharpnose sharks (Rhizoprionodon lalandii and R. porosus) caught artisanally in southeastern Brazil

et al. 2020

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Sharpnose sharks Rhizoprionodon lalandii and R. porosus are frequently captured in fishing activities in Brazil and are significantly consumed by humans, especially in southeastern Brazil. Both species lack population data and suffer intense fishing pressures and habitat degradation, consequently hindering adequate management and conservation actions. In this context, this study aimed to assess mercury (Hg) contamination in R. lalandii, and R. porosus sampled off the coast of Rio de Janeiro, addressing both animal health and public health risks. Sharks were obtained from two artisanal fishing colonies in southeastern Brazil (Copacabana and Recreio dos Bandeirantes), located on the coastal zone adjacent to Guanabara Bay, one of the most important, productive, and contaminated estuaries in Brazil, and a further three artisanal fishing colonies from the Região dos Lagos area (Saquarema, Cabo Frio and Rio das Ostras). Hg concentrations in liver, muscle, and brain in R. lalandii (n = 24) and R. porosus (n = 20) specimens were determined by inductively coupled plasma mass spectrometry. A gravid female measuring 112 cm from Copacabana is the first record for an individual of this size for R. lalandii. No correlation between length and muscle Hg concentrations was observed, and no differences between Hg concentrations for muscle or liver were found between male and female juveniles from either Cabo Frio or Rio das Ostras. No differences in Hg loads were observed herein for both assessed species. Low Hg bioaccumulation in juveniles and nongravid female muscle tissue was noted compared to significantly higher Hg concentrations in gravid females. Hg was detected in all embryos, indicating potential maternal offloading. As Hg thresholds for sharks in particular have not yet been established, whether the Hg concentrations detected in brain pose neurotoxic risks for these animals is not known. Public health concerns concerning adult R. lalandii consumption from Copacabana, however, are significant.

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“…Large size individuals of P. glauca had greater mercury and lead concentrations than small individuals. This is a well-documented process [12,13,20,[25][26][27][28][29][30][31][32][33][34] known as bioaccumulation [25,28,35]. The bioaccumulation process can take different pathways, one of which is through the diet (biomagnification).…”

Section: Discussionmentioning

confidence: 99%

Heavy Metal Concentrations of Two Highly Migratory Sharks (Prionace Glauca and Isurus Oxyrinchus) in the Southeastern Pacific Waters: Comments on Public Health and Conservation

López

Abarca

Meléndez

2013

Tropical Conservation Science

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Despite the importance of sharks in structuring the marine food web, their biomass is declining dramatically throughout the world´s oceans due to fishing pressures. Sharks caught as by-catch in long-line fisheries are sold for shark fins in the Asian fish market and secondarily as trunk sales for local consumption and fish meal. In order to determine the levels of heavy metals (mercury and lead) in oceanic shark populations in South Pacific waters, analyses of 39 Prionace glauca and 69 Isurus oxyrinchus were conducted. Mercury (Hg) and lead (Pb) were measured by cold vapor and via acetylene flame techniques, respectively. Mercury concentrations were similar in the studied sharks (p=0.1516), with 0.048 ± 0.03 μg•g-1 w/w for P. glauca and 0.034 ± 0.023 μg•g-1 w/w for I. oxyrinchus. P. glauca showed greater values of lead than I. oxyrinchus (p<0.001). Large specimens of both species showed high heavy metal concentration, while sexes showed no statistical differences (p>0.05). The metal concentrations reported in this work constitute a risk for human health, mainly from the high contributions of lead in tissues of P. glauca and I. oxyrinchus.

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Total Mercury in Liver and Muscle Tissue of Two Coastal Sharks from the Northwest of Mexico

Cited by 27 publications

References 11 publications

Mercury and Selenium in Muscle and Target Organs of Scalloped Hammerhead Sharks Sphyrna lewini of the SE Gulf of California: Dietary Intake, Molar Ratios, Loads, and Human Health Risks

Mercury and Selenium in Muscle and Target Organs of Scalloped Hammerhead Sharks Sphyrna lewini of the SE Gulf of California: Dietary Intake, Molar Ratios, Loads, and Human Health Risks

Mercury screening in highly consumed sharpnose sharks (Rhizoprionodon lalandii and R. porosus) caught artisanally in southeastern Brazil

Heavy Metal Concentrations of Two Highly Migratory Sharks (Prionace Glauca and Isurus Oxyrinchus) in the Southeastern Pacific Waters: Comments on Public Health and Conservation

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