The Status of the Lake Nicaragua Shark: An Updated Appraisal

The Status of the Freshwater Shark of Lake Nicaragua

Partitioning of body fluids in the Lake Nicaragua shark and three marine sharks.

The relative volumes of major body fluids of freshwater and marine sharks are remarkably similar in spite of the differences in external medium and in osmotic pressure of body fluids. The small differences detected are in agreement with differences reported in comparisons of freshwater and marine teleosts: a slightly higher total water content and a smiller ratio of extracellular to intracellul...

Macroinvertebrate diversity indices: A quantitative bioassessment of ecological health status of an oxbow lake in Eastern India

Aquatic macroinvertebrates, which play a significant role in the food chain of an ecosystem, are used in fresh water quality assessment to identify the environmental stress resulting from a variety of anthropogenic disturbances. Seasonal surveys of macroinvertebrate communities were conducted from April 2013 to March 2014 in Chhariganga oxbow lake of Nadia District of West Bengal, an eastern st...

The immunomodulatory effects of shark cartilage on the mouse and human immune system

Background: Sharks get cancer rarely. A major difference between these animals and other species is that sharks have a great amount of cartilaginous tissue. Immunomodulatory effects of the cartilage of some species (cow) have been proved. Because the immune system has a major role in the defense of the body against cancer, we studied the effects of shark cartilage on the mouse and human immune...

Bottom Sediments of Lake Nicaragua and Lake Managua, Western Nicaragua

Lakes Nicaragua and Managua are large, rather shallow, fresh-water bodies that lie in a late Tertiary and Quaternary graben in western Nicaragua. The bottom sediments comprise highly organic diatomaceous volcanic silts and clays in which quartz plagioclase feldspar, dioctahedral montmorillonite and volcanic glass are the principal constituents. ' Organic nitrogen content of the lake sediments r...