Mercury levels in feed and muscle of farmed tilapia.
BACKGROUND
Fish consumption is considered the most important source of contaminant exposure for humans beings, and farmed fish can be exposed to contaminants via feed supply.


METHODS
Total mercury concentrations (THg) were determined in the muscle, liver, and feed of farmed Nile tilapia (juveniles and adults) from four different fish farms in Brazil (net cages and intensive tanks systems), by a flow injection mercury system.


RESULTS
Mercury concentrations observed in fish muscle were markedly lower (13.5-30.5 µg kg(-1)) than the values recommended by ANVISA/MAPA for edible part of fish (500 µg kg(-1)), and in the liver the concentrations found were higher than in the muscle.


CONCLUSIONS
These low levels of THg in farmed tilapia may be due to the low THg concentrations found in the analyzed fish feed, that ranged from 5.2 to 33.2 µg kg(-1), below the limit of 100 µg kg(-1) established by the European Commission.
Laboratório de Radioisótopos Eduardo Penna Franca, IBCCF, Universidade Federal do Rio de Janeiro, Brazil. danibot13@gmail.com
Daniele
D
Botaro
João Paulo Machado
JP
Torres
Karl-Werner
KW
Schramm
Olaf
O
Malm
D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D000829:Animals, Domestic; D004784:Environmental Monitoring; D005506:Food Contamination / Q000032:analysis*; D008099:Liver / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry*; D017210:Tilapia; D014874:Water Pollutants, Chemical
D014874:Water Pollutants, Chemical; D008628:Mercury