Abstract
Svobodova, Z., O. âelechovska, J. Machova, T. Randak: Content of Arsenic in Market‐Ready Rainbow Trout (Oncorhynchus mykiss). Acta vet. Brno 2002, 71: 361‐367. The aim of this study was to assess the content of arsenic in market-ready rainbow trout (Oncorhynchus mykiss) which have been grown intensively and fed feeding mixtures containing fish meal and krill meal. Tissue samples analysed were of rainbow trout from 8 trout farms in the Czech Republic and from a station for biological checking the water quality at water processing plant in Prague Podoli. Samples of the feeds were analysed as well. Analysis comprised 74 muscle samples and 4 feed samples in total. Brown trout from nature was used as comparative material. Arsenic was determined by means of HG AAS method. The content of arsenic in muscle of rainbow trout from the trout farms under study, as well as from the biological check station can be assessed as strongly increased compared to values recorded in brown trout from nature (0.12 ± 0.07 mg·kg -1 ). In case of two trout farms and of the biological check station, the arsenic content recorded exceeded the hygienic limit of 1 mg·kg -1 valid for freshwater fish. Regression analysis of data proved a significant correlation (r = 0.57 ‐ 0.94) between arsenic content in muscle and fish weight. Arsenic content in BIOMAR and ALLER feeds ranged in 2.5 - 3.1 mg·kg-1. Results showed that the increased concentration of arsenic in muscle of marke-ready rainbow trout was due to presence of arsenic in feed. Based upon these facts, we recommend to pay attention to the problem in the near future and mainly to speciate arsenic compounds. Muscle, fish weight, commercial feed, AAS
Highlights
The aim of this study was to assess the content of arsenic in market-ready rainbow trout (Oncorhynchus mykiss) which have been grown intensively and fed feeding mixtures containing fish meal and krill meal
The content of arsenic in muscle of rainbow trout from the trout farms under study, as well as from the biological check station can be assessed as strongly increased compared to values recorded in brown trout from nature (0.12 ± 0.07 mg·kg-1)
In case of two trout farms and of the biological check station, the arsenic content recorded exceeded the hygienic limit of 1 mg·kg-1 valid for freshwater fish
Summary
The aim of this study was to assess the content of arsenic in market-ready rainbow trout (Oncorhynchus mykiss) which have been grown intensively and fed feeding mixtures containing fish meal and krill meal. The content of arsenic in muscle of rainbow trout from the trout farms under study, as well as from the biological check station can be assessed as strongly increased compared to values recorded in brown trout from nature (0.12 ± 0.07 mg·kg-1). Results showed that the increased concentration of arsenic in muscle of marke-ready rainbow trout was due to presence of arsenic in feed Based upon these facts, we recommend to pay attention to the problem in the near future and mainly to speciate arsenic compounds. Arsenic has a high ability to cumulate in bottom sediments (Pitter 1999) For this reason, increased attention is paid to the problems of arsenic content in aquatic organisms, above all in marine invertebrates and in fish (Khokiattiwong et al 2001; Kirby et al 2001; De Gieter et al 2001).
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