Preliminary investigation on the enrichment of heavy metals in marine sediments originated from intensive aquaculture effluents

Heavy metal pollution in sediments of a typical mariculture zone in South China

“…Zn, which is also used in boat maintenance and repair, showed the highest dissimilarity compared to others in the surface sediments from both the aquafarming and the non-aquafarming zones. Several studies have suggested that accumulations of heavy metals (Cd, Cu, Pb and Zn) in sediments might be attributed to the aquaculture activities (Mai et al, 2006;Mendiguchía et al, 2006;Sutherland et al, 2007;Basaran et al, 2009). Overall, our data showed that the aquafarming zone was more polluted than the non-aquafarming zone in Hailing Bay, and indicated that the elevated heavy metal levels in the sediments resulted partially from the aquafarming activities, such as waterway transportation and shipyard discharge.…”

“…These metals can enter estuaries and coastal waters through the discharge of industrial and municipal wastewaters, storm run-off, dust deposition, mine discharge, waste incineration, and other diffuse sources (Tanner et al, 2000;Dai et al, 2007;Meng et al, 2008;Zhang et al, 2008;Cheng et al, 2009;Besser et al, 2009;Cheng and Hu, 2010a,b;Hosono et al, 2010Hosono et al, , 2011. Sediment-bound heavy metals have a tendency to adsorb and accumulate on finegrained particles that eventually move into the depositional areas (Zhang et al, 2001;Morillo et al, 2002;Jain, 2004;Man et al, 2004;Qiu et al, 2005;Singh et al, 2005;Mendiguchía et al, 2006). Sediment pollution by heavy metals has been regarded as a critical problem in marine environment because of their toxicity and bioaccumulation (Chapman et al, 1998;Islam and Tanaka, 2004;Singh et al, 2005;Todd et al, 2010).…”

Copper transporter 1, metallothionein and glutathione reductase genes are differentially expressed in tissues of sea bream (Sparus aurata) after exposure to dietary or waterborne copper

“…This has been observed in both sea bream (Sparus aurata) aquaculture in the Mediterranean and Atlantic salmon aquaculture (Salmo salar) in Canada and Scotland (Chou et al, 2004;Mendiguchia et al, 2006;Dean et al, 2007). Sediment accumulation of Cu and Zn is largely due to the deposition of metal present in uneaten food and faeces and Cu levels of over 800 mgKg -1 , which considerably exceed the amount at which ecological effects may be predicted (Long et al, 1998), can be detected in the vicinity of fish cages (Dean et al, 2007).…”

Measurement of Aquaculture Chemotherapeutants in Flocculent Matter Collected at a Hard-Bottom Dominated Finfish Site on the South Coast of Newfoundland (Canada) After 2 Years of Fallow

“…Elements such as Cu, Cd, Zn, or Pb in sediments surrounding aquaculture sites are often linked to OM and used as aquaculture markers (Chou et al, 2002;Mendiguchía et al, 2006). In our study, Zn and Cd were the only metals whose concentrations were negatively correlated to distance to cage, and tended toward a correlation with OM (P = 0.0769 and 0.124 for Zn and Cd, respectively).…”