Total mercury in sharks along the southern Brazilian Coast

Mársico, Eliane Teixeira; Machado, M.; Knoff, Marcelo; Clemente, S.C. São

doi:10.1590/s0102-09352007000600039

Cited by 21 publications

(11 citation statements)

References 17 publications

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“…The wide variation in concentrations of THg in muscle found in the three species evaluated in this study agrees with previous studies that have reported also a wide range of concentrations in muscle THg for apex predators such as billfishes and large sharks and in other demersal fishes (Adams et al 2003;Marsico et al 2007;García-Hernández et al 2007;Escobar-Sánchez et al 2010). The variation in concentrations of THg in muscle could be due to biological variability associated with the same species (age, size, physiology, diet), geological influences (rock, sediment), physical-chemical conditions (water temperature, pH, ORP) (Licata et al 2005).…”

Section: Resultssupporting

confidence: 92%

“…The THg levels found in juvenile S. lewini were higher than those found in its congener S. zygaena (0.44 mg kg -1 ) off the coast of Santa Catarina southern Brazil (Marsico et al 2007) and on the coast of Baja California Sur (0.73 mg kg -1 ) (Escobar-Sánchez et al 2010). On the other hand, the concentrations of THg observed in S. lewini match the values reported for the same species examined from the Gulf of California (García-Hernández et al 2007).…”

Section: Resultsmentioning

confidence: 70%

“…The extent of THg provides an approximation of MeHg and has been recommended as a standard for regulatory control. In this situation, consumption of fish and by-products is the main route of human exposure to Hg compounds (Marsico et al 2007).…”

mentioning

confidence: 99%

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

Hurtado-Banda

Gómez-Álvarez

Márquez‐Farías³

et al. 2012

Bull Environ Contam Toxicol

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Total mercury (THg) in liver and muscle of three costal sharks from Mexico were evaluated. The highest concentrations of THg in muscle tissue of juveniles were found in Sphyrna lewini (0.82 ± 0.33 mg kg(-1) wet basis). Rhizoprionodon longurio adults had the highest concentrations (0.92 ± 1.03 mg kg(-1)). THg concentrations in liver were low compared to those found in muscle tissue; higher levels were found in liver of juvenile S. lewini (0.250 ± 0.07 mg kg(-1)). Results showed that 35 % of muscle tissue samples are above the precautionary limit (0.50 mg kg(-1) of THg) and a 7 % exceeded the maximum limit for human consumption (1 mg kg(-1)).

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 70%

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

Hurtado-Banda

Gómez-Álvarez

Márquez‐Farías³

et al. 2012

Bull Environ Contam Toxicol

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“…In Brazilian waters, high Hg levels have been reported in the bodies of top predators such as the swordfish Xiphias gladius and many shark species (Penedo de Pinho et al 2002, Mársico et al 2007, Dias et al 2008). In the Santos-São Vicente estuary, sea catfish Cathorops spixii with Hg concentrations as high as 0.447 mg kg −1 wet weight have been found (Azevedo et al 2012), while in Santos Bay, the Hg level can reach 0.11 mg kg −1 for this species (Azevedo et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Biomagnification of mercury through the food web of the Santos continental shelf, subtropical Brazil

Muto¹,

Soares²,

Sarkis³

et al. 2014

Mar. Ecol. Prog. Ser.

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This study was conducted on the continental shelf surrounding a large metropolitan region on the coast of São Paulo State, Southeast Brazil. This region harbours a large industrial plant and the largest port in Latin America, both of which release pollutants into the Santos−São Vicente estuarine system. High levels of Hg have been reported in sediments and fish from the estuaries and Santos Bay; however, data for the biota in offshore waters are scarce, and the biomagnification of Hg across the food web here has never been assessed. In this study, the trophic structure of the Santos shelf was addressed through the carbon and nitrogen stable isotope compositions of different species across a trophic gradient. We determined the total Hg levels (THg, dry weight) of invertebrates and fish to estimate the rate of biomagnification of this metal in the benthic and pelagic food webs. The lowest mean THg levels were found in zooplankton (0.006 µg g ). Overall, the Hg concentration in fish was below the recommended limit for human consumption. The THg and δ 15 N were positively correlated in both food webs; however, the rate of biomagnification was higher and the basal Hg was lower in the pelagic food web. These differences may be related to the differing bioavailability of mercury in water and sediment, the higher diversity of prey and more complex feeding interactions in the benthic food web, and metabolic differences among different taxa.

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“…This, in combination with contaminant inputs originating directly from industrial and urban sources located along the coast, makes this environment particularly interesting from the point view of contamination. Nevertheless, trace metal concentrations in these organisms are not well documented either in the Mediterranean area or in other marine regions, and the few studies concentrate on muscle tissue and/or liver only (Adams and McMichael 1999;Endo et al 2008;Ferreira et al 2004;Gibbs and Miskiewicz 1995;Lacerda et al 2000;Mársico et al 2007;McMeans et al 2007;Pinho et al 2002;Powell and Powell 2001;Serrano et al 1997Serrano et al , 2000Storelli et al 2003;Turoczy et al 2000), without any broader picture of the accumulation processes and distribution of the metals among the other tissues. According to the mechanisms of absorption, regulation, storage, and excretion of metals, the various fish tissues present varying bioaccumulation rates and due to their different roles in the above processes, their analysis lead to results with special interest and interpretation (Catsiki and Strogyloudi 1999).…”

Section: Introductionmentioning

confidence: 99%

Distribution of trace elements in the tissues of smooth hound Mustelus mustelus (Linnaeus, 1758) from the southern–eastern waters of Mediterranean Sea (Italy)

Storelli

Cuttone

Marcotrigiano

2010

Environ Monit Assess

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Trace element concentrations (Hg, Cd, Pb, Cr, Ni, Cu, Zn) were determined in the muscle, gonads, skin, and brain of smooth hound Mustelus mustelus in order to define the metal distribution patterns. The data indicated that metal accumulation depended on the tissues probably as a consequence of metabolic needs, physiochemical properties, and detoxification processes specific for each element. Metal concentrations were higher in gonads (Hg 0.10-0.70 μg g(-1); Cd 0.02-0.10 μg g(-1); Pb 0.08-0.39 μg g(-1); Cr 0.06-0.36 μg g(-1); Ni 1.37-3.00 μg g(-1); Zn 9.15-16.30 μg g(-1); Cu 1.95-21.62 μg g(-1)) and skin (Hg 0.16-0.66 μg g(-1); Cd 0.01-0.04 μg g(-1); Pb 0.10-0.62 μg g(-1); Cr 0.15-0.68 μg g(-1); Ni 1.60-7.20 μg g(-1); Zn 9.00-16.00 μg g(-1); Cu 0.78-6.80 μg g(-1)) than brain (Hg 0.04-0.34 μg g(-1); Cd 0.01-0.05 μg g(-1); Pb 0.03-0.59 μg g(-1); Cr 0.08-0.48 μg g(-1); Ni 5.59-9.69 μg g(-1); Zn 5.90-7.35 μg g(-1); Cu 0.90-4.02 μg g(-1)), while muscle always exhibited the lowest levels (Hg 1.03-2.58 μg g(-1); Cd 0.01-0.06 μg g(-1); Pb 0.02-0.16 μg g(-1); Cr 0.05-0.28 μg g(-1); Ni 1.13-2.48 μg g(-1); Zn 2.64-5.06 μg g(-1); Cu 0.33-2.23 μg g(-1)). Ni and Hg took exception having the highest concentrations in brain and muscle, respectively. An assessment of the risk for human due to the consumption of these marine organisms was also undertaken. Regarding Cd and Pb intakes, consumption did not guide to any concerns, while it should be extremely moderate when considering Hg intake. The comparative analyses revealed that Mediterranean sharks were exposed to higher Hg levels than biota inhabiting open ocean.

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Total mercury in sharks along the southern Brazilian Coast

Cited by 21 publications

References 17 publications

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

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

Biomagnification of mercury through the food web of the Santos continental shelf, subtropical Brazil

Distribution of trace elements in the tissues of smooth hound Mustelus mustelus (Linnaeus, 1758) from the southern–eastern waters of Mediterranean Sea (Italy)

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