Just as we humans depend on our atmosphere to respire so does all aquatic life depend on their hydrosphere (water). Humans will greatly be affected if the atmosphere is polluted with noxious gases so also all aquatic life if their environment (which is water) is polluted with effluents. Therefore as we humans are dependent on the quality of air we breathe so also do all aquatic life depend on the water quality of the water they exist in. River Ogun is a free to all perennial river that is at risk of ecological collapse. This book is an invaluable guide and reference for those into Assessment of surface water quality, Environmental Monitoring, Management and Protection, Aquatic studies, Plankton studies and studies on the Physico-chemical properties of water.