A survey of metals in tissues of farmed Atlantic and wild Pacific salmon

Abstract

Contamination of fish tissues with organic and inorganic contaminants has been a pervasive environmental and public health problem. The present study reports the concentrations of nine metals in tissues of farmed Atlantic salmon (Salmo salar) and two species of wild-caught salmon (chum [Oncorhynchus keta] and coho [O. kisutch]) analyzed as part of a global survey of contaminants in these fish. Of the nine metals, organic arsenic was significantly higher in farmed than in wild salmon, whereas cobalt, copper, and cadmium were significantly higher in wild salmon. None of the contaminants exceeded federal standards or guidance levels.

Tissue residue concentrations of organohalogens and trace elements in adult Pacific salmon returning to the Fraser River, British Columbia, Canada

“…2b; Supplemental Data, Table S3). In general, element concentrations observed in these Pacific salmon are comparable to previously reported levels [27,28]. Figure 2b, illustrating the rank order of various trace elements in Thompson River chinook sampled in the lower Fraser River, shows concentrations ranging from 0.01 mgÁg À1 wet weight for Sb to 7.5 for Zn.…”

The chemical signature of retained hooks in mulloway (Argyrosomus japonicus) revealed by otolith microchemistry

“…More specifically, the concentrations of Mn, Ba and Cr were lower in wild fish compared to those reared in aquaculture facilities. This pattern is consistent with previous findings where farmed individuals of the same species studied here and in Atlantic Pacific salmon, Salmo salar, had different concentrations of metals when compared to wild individuals (Foran et al, 2004;McGrath et al, 2014). The otolith elemental composition is regulated by multiple factors that include but are not limited to; fish condition, environment composition, age and/or stress (Chang and Geffen, 2013).…”

Fish Nutrition and Current Issues in Aquaculture: The Balance in Providing Safe and Nutritious Seafood, in an Environmentally Sustainable Manner

“…heavy metals) in farmed salmon have raised questions regarding the relative health risks and benefits of farmed salmon consumption [73]. However, the accumulation of some contaminants is the result of indirect exposure, and can equally affect wild salmon [74]. This review will only focus on POPs accumulated in the flesh as a direct result of the feed.…”