Fish, mercury level

Hydro Quebec, Genivar. 1997. Summary Report. Evolution of fish mercury levels at the La Grande complex, Quebec. (1978-1994). 

Bodaly RA, Hecky RE, Fudge RJP. 1984. Increases in fish mercury levels in lakes flooded by the Churchill River diversion, northern Manitoba. Can J Fish Aquat Sci 41 682-691. 

Johnston TA, Bodaly RA, Matias JA. 1991. Predicting fish mercury levels from physical characteristics of boreal reservoirs. Can J Fish Aquat Sci 48 1468-1475. 

Schetagne R, Verdon R. 1999. Post-impoundment evolution of fish mercury levels at the La Grande complex, Quebec, Canada (from 1978 to 1996). In Lucotte M, Schetagne R, Therien N, Langlois C, Tremblay A, editors. Mercury in the biogeochemical cycle. Berlin, Germany Springer, p. 235-258. 

Sonesten L. 2003. Fish mercury levels in lakes — adjusting for Hg and fish-size covariation. Environ PoUut 125 255-265. 

The use of stable isotopes of mercury to track pathways of inputs and uptake is innovative. The additions will be increased over time to levels comparable to the current mercury deposition in the northeastern US. The work is ongoing and, as of 2002, one paper has been published (Hintelmann et al., 2002). We wish to reemphasize that in productive near-shore regions of marine ecosystems, the legacy of pollution derived mercury in the surficial sediments is likely to predominate over new mercury as a substrate for methylation. The intense bioturbation in coastal marine sediments can keep much historical mercury active, relative to the more quiescent sediments of lakes. Unfortunately, the mechanistic predictions for declines in fish mercury levels following controls on mercury emissions, derived from the anticipated successful METAALICUS program, will not be applicable to the marine environment. 

M) 10.8 50 Sweden. High consumption of freshwater fish. Mercury levels in fish generally below 1 ppm Oskarsson et al. 1990... 

Applicable to Sweden in general is that extremely few lakes with pH values below 5 have mercury levels in 1-kilo-pike of less than 1 mg/kg. At a pH value of 6, for instance, the normal level for the same pike would be approximately 0.6 mg/kg. In the interval of pH values between 4.5 - 6.5, a 0.5 unit change in the pH value corresponds to a change in the fish mercury level of approximately 0.25 ppm. There is a tendency for the pH-effect to be greater at low pH values, indicating that the correlation is not linear when acidification is measured with pH as a logarithmic unit. 

According to NAS, "Fish-eating birds should be protected if mercury levels in fish do not exceed 0.5 mg/g."... 

Francesconi KA, Lenanton RCJ. 1992. Mercury contamination in a semi-enclosed marine embayment organic and inorganic mercury content of biota, and factors influencing mercury levels in fish. Mar Envhon Res 33 189-212. 

Gdthberg A. 1983. Intensive fishing — a way to reduce the mercury level in fish. Ambio 12 259-261. 

Masson S, Tremblay A. 2002. Effects of intensive fishing on the structure of zooplankton communities and mercury levels. Sci Total Environ 304 377-390. 

Porvari P. 1995. Mercury levels of fish in Tucumi hydroelectric reservoir and in River Mojn in Amazonia, in the state of Para, Brazil. Sci Total Environ 175 109-117. 

Suns K, Hitchin G. 1990. Interrelationships between mercury levels in yearling yellow perch, fish condition and water quality. Water Air Soil PoUut 50 255-265. 

Cumbie PM. 1975b. Mercury levels in Georgia otter, mink, and freshwater fish. Bull Environ Contam Toxicol 14 193-196. 

Mercury levels have been determined in seven fish species (European catfish, northern pike, common carp, rudd, roach, barbell, and bleak) from the three mercury pollution hotspots of the Ebro River basin previously described, namely Sabinanigo, Monzon, and Flix areas and downstream sites (Fig. 1). These species display different diet and habitat and belong to different families siluridae, esoci-dae, and cyprinidae. 

Additionally, the determination of THg levels in muscle of some fish species within the Flix reservoir has been studied (Diez, unpublished results). As expected, THg concentrations increased with trophic level. A comparison between mercury levels in muscle tissue of the individual fish species (p < 0.05) produced the following order European catfish > common carp > rudd > roach. Average THg concentrations (in ww) in muscle of European catfish (n = 9), common carp (n = 30), rudd (n = 20), and roach (n = 5) were 0.848 0.476 ig/g 0.333 0.155 pg/g 0.283 0.163 pg/g and 0.217 0.199 pg/g, respectively. The relative trophic level of the analyzed species is based on a generalized knowledge of the species and stomach contents of the studied adult fish populations [56, 60, 62, 71],... 

Raldua D, Diez S, Bayona JM, Barcelo D (2007) Mercury levels and liver pathology in feral fish living in the vicinity of amercury cell chlor-alkali factory. Chemosphere 66 1217-1225... 

Schlenk D, Zhang YS, Nix J (1995) Expression of hepatic metallothionein messenger RNA in feral and caged fish species correlates with muscle mercury levels. Ecotoxicol Environ Saf 31 (3) 282-286... 

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