Concentrations of cadmium, copper, lead and zinc in shrimps Macrobrachium americanum from Baluarte River, Rosario, Sinaloa, Mexico.

Abstract

The present study was carried out with the objective of assess the content of Cd, Cu Pb and Zn in the abdomen (edible tissue) and hepatopancreas of the crayfish Macrobrachium americanun (Bate, 1868) from the Baluarte River, Rosario, Sinaloa, Mexico. During May 2010, a total of 15-20 adult organisms (> 15 cm total length) were collected. Tissues were dried and the metal content was determined by atomic absorption spectrophotometry. In the muscle, the decreasing order was Zn> Cu> Pb> Cd with ranges of 45.5-58.9, 24.7-27.3, 3.8-4.3 y 0.6-0.7 mg/g (dry weight), respectively; while in the hepatopancreas the decreasing order was Cu> Zn> Cd> Pb with ranges of 153.4-387.9, 51.1-147.9, 50.1-
130.1y 4.5-6.5, respectively. In all cases the concentrations were significantly higher in the organisms collected in the upper part of the river. According to metal content and international maximum permissible limits, proposed by international standards, in this work Pb was the element that limited the consumption of muscle of this species, since a consumption of 68.9-78.5 g (fresh weight) reaches the permissible limit.