Trace elements and oxidative stress indicators in the liver and kidney of the blue shark (Prionace glauca)

Mercury, cadmium, zinc and copper concentrations and stable isotope ratios of carbon and nitrogen in tiger sharks (Galeocerdo cuvier) culled off Ishigaki Island, Japan

“…Similar levels of Cd were reported in the livers of other shark species (Vas, 1991;Turoczy et al, 2000). To our knowledge, the highest Cd concentration so far reported in any shark species is 155 g/wet g in the liver of a blue shark (Prionace glauca) (Barrera- García et al, 2013).…”

“…3 was about 4. Similar ratios of Zn/Cu were found in the livers of blue sharks (5.4) ( Barrera-García et al, 2013) and Greenland sharks (3.9) (McMeans et al, 2007).…”

“…in the livers of Pacific sleeper sharks (Somniosus pacificus) (n = 14) and Greenland sharks (Somniosus microcephalus) (n = 24) were 10.39 ± 0.708 and 6.898 ± 0.388 g/wet g, respectively, and the average Cu concentrations in those sharks were 0.833 ± 0.071 and 1.754 ± 0.202 g/wet g, respectively. Barrera-García et al (2013) reported high levels of Zn and Cu as well as Cd in the liver of blue sharks: the Zn, Cu and Cd concentrations (n = 34) were 49.94 ± 27.1, 9.28 ± 8.39 and 34.66 ± 29.61 g/wet g, respectively, with a significant positive correlation observed between the Zn and Cd concentrations. They suggested that the high Zn concentrations may be related to the presence of Cd, as Zn has a protective effect against Cd toxicity in the liver, binding to MT and inducing MT synthesis.…”

Metal Concentrations in the Liver and Stable Isotope Ratios of Carbon and Nitrogen in the Muscle of Silvertip Shark (Carcharhinus albimarginatus) Culled off Ishigaki Island, Japan: Changes with Growth

“…The average Hg concentration found in the muscle samples from the silvertip sharks (2.04 ± 1.16 μg/wet g, n = 71) is apparently higher than those in other shark samples such as spiny dogfish, shortspine dogfish, star-spotted dogfish and tiger sharks from Japanese waters ( Table 3 ), as well as 11 shark species [ 15 ] and most demersal sharks [ 29 ] from Australian waters. The average Hg concentration found in the liver samples from the silvertip sharks (3.34 ± 6.56 μg/wet g, n = 71) is also apparently higher than that in spiny dogfish, star-spotted dogfish, and tiger sharks from Japanese waters ( Table 3 ), blackmouth dogfish ( Galeus melastomus ) from the Mediterranean [ 30 ], blue sharks from Baja, California [ 31 ], and small-fin gulper sharks ( Centrophorus moluccensis ) from the western Indian Ocean [ 32 ]. The slow growth of silvertip sharks [ 22 , 23 ] may be one reason for the higher Hg concentrations in the liver and muscle.…”

Oxidative stress and RNA DNA ratio following longline capture in the silky shark Carchahrinus falciformis (Muller and Henle, 1839)

“…Paon & Kenchington (1995) and Pérez-Camacho et al (2003) suggested that the high costs of reproduction in females required increased levels of protein synthesis. Barrera-García et al (2013) measured higher levels of glutathione peroxidase and CAT activity in immature than mature females of the blue shark (P. glauca), in contrast to the higher SOD levels in adult than young females. The levels of MDA in these speci- mens evidenced the extensive cellular damage due to oxidative stress (Fig.…”