Seasonal Variation of Metal Concentrations in Catfish, Blue Crab and Crayfish from Warri Coastal Water of Delta State, Nigeria

Endotoxin-induced coagulation reactions and phenoloxidase activity modulation inSudanonautes africanushemolymph fractions

“…These values are far lower than those here in the hemolymph of the S. africanus crabs (i.e., 26.53 [± 6.67] mg/l (ppm), ≈ 15 times higher than crab value and 377 times that for prawn). Cd levels in Blue crab and crayfish sampled in Delta State, Nigeria (several hundred miles SE of Ilorin) were between, 1.62-12.88 ppm and 0.038-18.13 ppm, respectively (Olowoyo, 2010). The concentrations of metals in the tissues of these various crustaceans appeared to vary with their environments.…”

Hemolymph coagulation and phenoloxidase activity inUca tangeriinduced byEscherichia coliendotoxin

“…The result from the analysis of some metals in the plasma revealed a high amount of sodium and potassium, indicating high amounts of salts (salinity) in the environment of the crab (and thus a marine habitat). The absence of heavy metals such as cadmium and lead indicated that little pollution was present in the habitat of the crab (Olowoyo et al 2010). This might be due to a large expanse of the marine environment that may sufficiently dilute pollutants from onshore thus preventing the accumulation of pollutants in the seawater.…”

Bioaccumulation of Heavy Metals and Hydrocarbons in Hemichromis Fasciatus Exposed to Surface Water in Borrow Pits Located Within Onshore Oil Exploration and Production Area

“…Heavy metals (e.g., Fe, Ni, Cd, Cu, Cr, Ba, etc) and many organics like hydrocarbons and pesticides have been reported in various concentrations in many rivers and creeks in the Niger Delta region of Nigeria (Anyakora et al, 2005;Olowoyo et al, 2010;Godwin et al, 2011;Nwabueze, 2011) and these pollutants have a tendency to accumulate in biota (Landrum et al, 2003;Anyakora & Coker, 2007) and undergo food chain magnification (James et al,1998). It is therefore imperative to monitor the concentration of these pollutants in the environment and to analyze bioaccumulation process in order to assess the possible impact on human health and risk which man faces in such an environment (Kotze et al, 1999).…”