Trace metal content in deep-water sharks from the eastern Mediterranean Sea

Hornung, Hava; Krom, Michael D.; Cohen, Yuval; Bernhard, M.

doi:10.1007/bf00346351

Cited by 65 publications

(24 citation statements)

References 23 publications

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“…This is consistent with previous field observations, which generally show decreasing metal concentrations with increasing trophic level (Hornung et al 1993, Canli & Atli 2003, IAEA 2004. While several studies have noted the possibility of Se, Zn, and Cd biomagnification in certain marine food chains, the organisms considered were much smaller than the predators used in the present study.…”

Section: Biomagnification Of Metals In Marine Fishessupporting

confidence: 93%

“…Numerous field studies have reported metal concentrations in fish and have found great variability, both intra-and interspecifically (Hornung et al 1993, Mason et al 2000, Canli & Atli 2003, but mechanistic studies are rare, and consequently the processes governing such variability remain largely unknown. In order to assess the extent to which dietary metal uptake varies between fish species, we compared the accumulation and retention of dietary metals in teleost and elasmobranch fishes.…”

Section: Introductionmentioning

confidence: 99%

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Assimilation and retention of metals in teleost and elasmobranch fishes following dietary exposure

Mathews¹,

Fisher²,

Jeffree³

et al. 2008

Mar. Ecol. Prog. Ser.

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In a radiotracer study designed to evaluate the fate of metals from fish prey to predator fish, we measured the trophic transfer of 7 trace elements (Am, Cd, Co, Cr, Cs, Mn, Zn) from juvenile Mediterranean sea bream Sparus auratus to 3 predator species, the teleosts Psetta maxima and Sparus auratus, and the elasmobranch Scyliorhinus canicula. Prey S. auratus were labeled by exposure to metal radioisotopes in solution for a period of 3 wk and were then fed to predators, after which the metal retention in the predator was assessed. Mean assimilation efficiencies (AEs) of ingested metals in the predator fishes ranged from 6 to 15% for Am, to 63 to 74% for Cs; significant differences in AEs were noted between species for Co and Mn only. Efflux rate constants (k e ) of assimilated metal did not differ consistently among predators for any metals. The mean k e ranged from 0.003 d -1 for Mn in S. canicula to 0.02 d -1 for Cd and Cs in all 3 species and for Co in S. canicula. Trophic transfer factors (TTF) for each metal were determined in predator fishes to assess the potential for metal biomagnification. TTF, calculated by dividing the product of metal AE and ingestion rate (IR) by k e , exceeded 1 only for Mn, Zn and Cs. For most likely scenarios of IR and AE, TTF was <1 for these metals, suggesting that these metals will not biomagnify in piscivorous fishes.

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Section: Biomagnification Of Metals In Marine Fishessupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Assimilation and retention of metals in teleost and elasmobranch fishes following dietary exposure

Mathews¹,

Fisher²,

Jeffree³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…The biological traits of these animals as longevity and slow growth rates, in conjunction with the high trophic status of many shark species, have been invoked to explain the high levels encountered in their meats (Lyle 1984 Windom et al 1973) revealed higher brain levels and comparable skin levels (0.02-0.28 μg g −1 ; Pethybridge et al 2010) with respect to those encountered in the organisms under study. Higher Cd levels were found in brain (Núnez-Nogueira 2005) and skin (Vas 1991) of specimens from Atlantic Ocean, whereas good agreement was generally observed when muscle tissue results were compared with those reported in literature by several authors (Cornish et al 2007;Hornung et al 1993;Lacerda et al 2000;Powell and Powell 2001;Turoczy et al 2000). Also, Pb concentrations occurring in muscle tissue (Gibbs and Miskiewicz 1995;Storelli et al 2003;Turoczy et al 2000;Vas 1991), skin, and gonads (Vas 1991) of the specimens here examined were within the previously reported ranges for other shark species, but the levels in brain were many times lower than the values displayed in literature (Núnez-Nogueira 2005).…”

Section: Tissue/organ Distribution Of Concentrationssupporting

confidence: 42%

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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“…For comparisons with this study, only for the genera Centrophorus, Etmopterus, Squalus, Dalatias, Deania and Chimaera are some published data available (e.g., De Pinho et al, 1989;Hornung et al, 1993 ;Davenport 1995;Turoczy et al, 2000;Storellii et al, 2002; and reviewed by Cossa and Coquery, 2005). Results from the present study are the first published for dogfish, Etmopterus baxteri, Proscymnodon plunketi, chimaeras, Rhinochimaera pacifica, and Chimaera lignaria, and deepwater catshark, Apristurus sp (A and C) and Figaro boardmani.…”

Section: Interspecific Local and Regional Hg Variations In Sharks Mumentioning

confidence: 99%

Mercury in 16 demersal sharks from southeast Australia: Biotic and abiotic sources of variation and consumer health implications

Pethybridge

Cossa

Butler

2010

Marine Environmental Research

139

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International audienceTotal mercury (THg) and monomethylmercury (MMHg) concentrations were determined in the tissues of demersal shark (Order Squaliformes and the Families: Scyliorhinidae, Hexanchidae) and chimaera species (Families: Chimaeridae and Rhinochimaeridae) from continental shelf and slope waters off southeast Australia, including embryos, juveniles and adults. The distribution of THg in various tissues (muscle, liver, kidney, and skin), examined in ten species, shows higher levels in the muscle tissue (1.49 ± 0.47 mg kg, ww), which accounted for between 59 – 82% of the total body burden of mercury and in the kidney (0.93 ± 0.14 mg kg, ww) and liver (0.61 ± 0.25 mg kg, ww) with lower levels observed in the skin (0.12 ± 0.06 mg kg, ww). Additional THg determinations were performed in the muscle tissue of five other species allowing geographical and interspecific comparisons. Speciation analysis demonstrated that more than 90% mercury was bound in muscle tissue as MMHg with higher percentages (>95%) observed in sharks species occupying deeper environments. Species differences were observed. Highest THg levels in the muscle tissue (up to 6.64 mg kgwet weight, ww) were recorded in and (mean values; 4.47 ± 1.20 and 3.52 ± 0.07 mg kg, ww, respectively). Consistent with the ongoing paradigm on mercury bioaccumulation, we systematically observed THg concentrations increasing with animal size from the embryos to the larger sharks. Embryos of and had average levels 0.28 and 0.06 mg kg (ww), while adult specimens reached 3.3 and 2.3 mg kg (ww), respectively. THg concentrations in Australian sharks were compared with the same genus collected in other world regions. Levels were closer to data reported for East Atlantic than for the epicontinental Mediterranean margins. At a smaller geographical scale, the habitat effect on mercury concentration in sharks seems less clear. Squalid sharks occupying shelf waters showed higher mean mercury levels relative to their size (body weight, bw) than mid-slope species (0.4 – 6.7 mg kg bw and 0.3 – 2.2 mg kg bw, respectively). However, local regional differences (East and South Tasmania Victoria) in Hg levels were not detected for the majority of taxa examined. All species, with the exception of showed values greater than 0.5 mg kg (ww) and all but four were above many international regulatory thresholds (1.0 mg kg, ww)

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Trace metal content in deep-water sharks from the eastern Mediterranean Sea

Cited by 65 publications

References 23 publications

Assimilation and retention of metals in teleost and elasmobranch fishes following dietary exposure

Assimilation and retention of metals in teleost and elasmobranch fishes following dietary exposure

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

Mercury in 16 demersal sharks from southeast Australia: Biotic and abiotic sources of variation and consumer health implications

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