title: Preferential feeding on high quality diets decreases methyl mercury of farm-raised common carp (Cyprinus carpioL.).
abstract: This study on aquaculture ponds investigated how diet sources affect methyl mercury (MeHg) bioaccumulation of the worldwide key diet fish, common carp (Cyprinus carpio). We tested how MeHg concentrations of one and two year-old pond-raised carp changed with different food quality: a) zooplankton (natural pond diet), b) cereals enriched with vegetable oil (VO ponds), and c) compound feeds enriched with marine fish oils (FO ponds). It was hypothesized that carp preferentially feed on supplementary diets with the highest biochemical quality (FO diet over VO diets over zooplankton). Although MeHg concentrations were highest in zooplankton of FO ponds, MeHg concentrations of carp were clearly lower in FO ponds (17-32 ng g- 1dry weight) compared to the reference (40-46 ng g- 1dry weight) and VO ponds (55-86 ng g- 1dry weight). Stable isotope mixing models (δ13C, δ15N) indicated selective feeding of carp on high quality FO diets that caused MeHg concentrations of carp to decrease with increasing dietary proportions of supplementary FO feeds. Results demonstrate that carp selectively feed on diets of highest biochemical quality and strongly suggest that high diet quality can reduce MeHg bioaccumulation in farm-raised carp.
authors.affiliation: WasserCluster Lunz, Biologische Station, Aquatic Lipid Research and Ecotoxicology, Dr. Carl Kupelwieser Promenade 5, A-3293 Lunz am See, Austria ; Universität Wien, Department of Limnology, Althanstraße 14, A-1090 Wien, Austria.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Schultz
authors.forename: Birgit
authors.initials: B
authors.lastname: Vallant
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Kainz
keywords: Common carp; Methyl mercury; Stable isotopes; Trophic transfer
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