Bioaccumulation of cadmium by nile tilapia Oreochromis niloticus (L.) in the presence of green algae Cladophora glomerata (L.) kutz

Accumulation of cadmium (Cd) was determined in the muscle and gill tissues of Nile tilapia Oreochromis niloticus (L.) exposed to sublethal concentrations of Cd (0.1 and 1.0 mg/L) under laboratory conditions for 15 and 30 days, in the absence or presence of green algae Cladophora glomerata (L.) Kutz. Results showed that muscles, irrespective of treatments, accumulated less Cd than gills. Cd accumulation significantly increased in both the tissues in treatment groups as compared to control groups (p0.05). Presence of green algae did not influence accumulation of Cd in muscle. But Cd accumulation was significantly reduced in gills, in the presence of green algae, in all treatments groups, except in 0.1 mg/L Cd exposure for 15 days. In the presence of green algae, the reduced Cd accumulation in gills might be due to its uptake from the medium by the algae

Determination of Bioaccumulation of Heavy Metals and Selenium in Tissues of Brown Trout Salmo trutta macrostigma Duméril 1858 from Munzur Stream Tunceli Turkey

The objective of the present work was to determine the bioaccumulation of arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), mercury (Hg), uranium (U) and selenium (Se) in gill, liver, and muscle tissues of the fresh water fish Salmo trutta macrostigma (Duméril, 1858) in Munzur Stream, Tunceli, Turkey. The highest concentrations of U (1.83 μg kg−1), Pb (119.84 μg kg−1) and Se (1.31 μg kg−1) were recorded in the gills of S. t. macrostigma. Concentrations of As (46.27 μg kg−1), Cd (109.19 μg kg−1), Hg (16.40 μg kg−1), Cu (18.19 μg kg−1) were recorded at highest levels in the liver. The results showed that there were significant differences in concentrations of As, Cd, Cu, Pb, Se, U and Hg in gill, liver and muscle tissue (p < 0.05). Heavy metals were within the edible parts of the investigated fish were in the permissible safety levels for human uses