Abstract
In this study, concentrations of trace elements in tissues of shrimp species (Litopenaeus vannamei) from farming and zone natural coastal located in the northeastern Brazil were investigated. The elements determination was performed by optical emission spectrometry with inductively coupled plasma (ICP OES). The following ranges of concentrations in the tissues were obtained in µg g-1 dry weight: Al: 13.4-886.5, Cd: 0.93-1.80; Cu: 24.8-152; Fe: 3.2-410.9; Mn: 0.36-24.4; Se: 0.094-9.81 and Zn: 20.3-109.4. The shrimp muscle can be a good iron source (about 88.9 mg-1g dry weight). The distribution of Se concentration in tissues showed much variation between locations, and the concentration levels found in shrimp muscles of wild samples were high, where its levels in 67% of muscle and 50% of others tissues samples exceeded the ANVISA limit, indicating evidence of selenium bioaccumulation. Significant correlation was observed between the following pairs of elements: Fe-Zn (r= -0.70), Mn-Cu (r= -0.74), Se-Cu (r= -0.68), Se-Mn (r= 0.82) in the muscles; Fe-Al (r= 0.99), Mn-Al (r= 0.62), Mn-Fe (r= 0.62), Se-Al (r = 0.88), Se-Fe (r= 0.87), Se-Mn (r= 0.58) in the exoskeleton and Cu-Zn (r = 0.68), Al-Cu (r= 0.88), Fe-Cu (r= 0.95) and Fe-Al (r= 0.97) in the viscera.
Highlights
Intensive shrimp aquaculture is a recent development of the Brazilian agribusiness but has increased by about 20% per year during the last decade, along the semi-arid northeastern coast of Brazil due to the optimal climate and environmental setting (Gräslund and Bengtson, 2001).Seafood products are indicated as part of a balanced human diet
The purpose of this work was to characterize the levels of aluminum (Al), cadmium (Cd), copper (Cu), iron (Fe), lead (Pb), molybdenum (Mo), manganese (Mn), selenium (Se) and zinc (Zn) in some tissues of the major economically important shrimp specie Litopenaeus vannamei caught off farms and zone natural coastal located in the Bahia, Brazil
These results indicate that trace elements accumulation is greater in viscera than in muscle in shrimp from all areas, except for Zn
Summary
Intensive shrimp aquaculture is a recent development of the Brazilian agribusiness but has increased by about 20% per year during the last decade, along the semi-arid northeastern coast of Brazil due to the optimal climate and environmental setting (Gräslund and Bengtson, 2001).Seafood products are indicated as part of a balanced human diet. Intensive shrimp aquaculture is a recent development of the Brazilian agribusiness but has increased by about 20% per year during the last decade, along the semi-arid northeastern coast of Brazil due to the optimal climate and environmental setting (Gräslund and Bengtson, 2001). Trace elements in tissues of Litopenaeus vannamei invertebrates are known to accumulate trace elements in its tissues and can be a potential source of inorganic contaminants (Fallah et al, 2011). Shrimp farms generally are located next to the coast and use the seawater directly from the coastal area to farm shrimps (Wu and Chen, 2004). Coastal zones located near major urban areas are often subjected to severe contamination (Diodato et al, 2012), such as trace elements, which are often problematic environmental pollutants
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