Juniper Publishers-Oceanography Open Access Journal

  Juniper Publishers -  Journal of Oceanography Abstract The concentrations of Iron (Fe), Copper (Cu), Zinc (Zn), Lead (Pb), Cadmium (Cd), Chromium (Cr) and Manganese (Mn) in water, sediment and selected fish samples from Ureje water reservoir, Ado Ekiti, were determined using Atomic Absorption Spectrophotometer (AAS). A total of three samples each of water, sediment, fishes (Hemichromis fasciatus & Hepsetus odoe) were collected and analyzed for heavy metals. Data obtained were subjected to analysis of variance (ANOVA) test at 0.05%. The results showed higher levels of Zn (13.08±0.45mg/g) and Fe (2.10±0.56mg/g) in fish in comparison with other heavy metals examined. Chromium has exceeded the toxicity threshold in the muscle of the fishes in line with WHO standards in food. Cadmium was not detected in soil, while other elements detected were in trace amount below the Environmental Protection Agency allowable limits in soil. In water, except for Fe (1.25±0.0...

Juniper Publishers -  Journal of Oceanography Abstract Sharks are top predator marine species with high ecological and economical value mainly due to their trophic status and high demand for fins. The blue shark,  Prionace glauca,  is one of the main targets of the shark fishing industry. The application of genetic markers is key to understand the population dynamics and management of elasmobranchii species under fishing pressure. In this study, levels of mitochondrial and nuclear genetic diversity of Eastern Tropical Pacific populations of the blue shark were investigated. Results from both markers show interesting differences. mtDNA analyses indicated no significant population differentiation between population units in the Eastern Tropical Pacific and the Western Pacific. Genetic differentiation detected in the microsatellite analyses, indicated more than one blue shark stock in the Eastern Tropical Pacific (F ST =0,079, P<,05). Based on the identification ...

                  Juniper Publishers -  Journal of Oceanography Abstract With the increasing demand for clean energy in emerging economies like India, the requirement for Rare Earth Elements (REE) along with thorium is getting enhanced. In such a situation an indigenous resource of these are important. The easy extraction of these elements from beach placers has attracted considerable interest. However, mining in beach areas can have a detrimental impact, if suitable measures are not undertaken. The impact of mining of heavy minerals, primarily by dredging, along the east coast of India is discussed. Keywords:  Heavy minerals; Rare earth metals; Monazites; Erosion; Beach placers Go to Introduction The peninsular India is bounded on three sides by water and one side by land. It has a long coastal tract of 7,517km. The sedimentary deposit present along this vast coast is an important setting for mineral deposits. T...