Methylmercury Concentrations in Six Fish Species from Two Colombian Rivers

Abstract

The objective of this study was to determine whether fish collected from the La Miel or Nechí Rivers (Colombia) differed in muscle methyl mercury (meHg) concentration. Two fish from six different species were collected from markets adjacent to each river. Overall, fish collected from the market adjacent to the Nechí River contained higher levels of meHg. This result however is being driven by very high meHg concentrations in four individual fish, three of which are Pimelodid, long-whiskered catfish. These catfish may represent ideal sentinel organism for the detection of meHg contamination in Colombian rivers.

Methylmercury in fish from the southern Baltic Sea and coastal lagoons as a function of species, size, and region

“…Mean concentration of MeHg constituted more than 80% of the THg in the muscles of cod, garfish, flatfish, sea trout, burbot, and roach; approximately 70% in the muscles of herring, salmon, perch, bream, and mackerel; and less than 60% in sprat, carp, panga, and tilapia (Table 1). The data in the literature reflect a wide range in the percentage of MeHg in THg in the muscles of fish depending on the species: in fish available for purchase on the German market, the mean was 70% within a range of 44–100% (Kubala et al, 2011); in fish caught in the Baltic it was above 82% (Kwaśniak et al, 2012); in predatory fish caught off of the coast of Brazil it was 70% (Kehrig et al, 2008); in commercial fish from Japan it was 67% (Yamashita et al, 2005); in fish caught in the North Sea it was 95% (Baeyens et al, 2003); in fish from Columbia it ranged from 80% to 98% (Alvarez et al, 2012; Marrugo-Negrete et al, 2008); and in fish caught in the vicinity of the Azores it was 88% (Magalhaes et al, 2007).…”

A Computer Aided Approach for River Styles—Inspired Characterization of Large Basins: The Magdalena River (Colombia)

“…In addition, land use has been profoundly changed in the Magdalena River Basin by population growth, involving somewhat uncontrolled deforestation and urbanization and industrial as well as illegal mining development. This has resulted in an increment of the sediment load [15,16] and, more recently, of the load of wastes and toxic compounds to the rivers linked to gold mining in particular [17,18]. Moreover, many heavy interventions included in the political agenda are added to the list of on-going and future causes of negative impacts on the basin.…”

Untitled

“…Anomalías hematológicas Gill & Pant (19) Revista de Investigación: Ciencia, Tecnología y Desarrollo (2019) 5(1): [3][4][5][6][7][8][9][10][11] La mortalidad acumulada en porcentaje y el número de individuos a las 96 horas de exposición se registran en la tabla 2. En donde se observa las mortalidades pasadas las 24, 48, 72 y 96 horas con un porcentaje acumulado de 6,6, 23,3 y 96,6 % en las concentraciones 0,010, 0,100 y 1,000 mg Hg/l, respectivamente.…”