Table of Contents
What causes fish kills in rivers?
Fish kills occur when several contributory factors occur simultaneously such as prolonged cloudy weather, drought conditions, overcrowded fish populations, excessive algae or other plant growths and high water temperatures.
What is that kills the fish in the polluted water?
Fishes die due to pollution of water from pesticides adjoining the cultivation fields. Pesticides flow off into the water proving fatal for the aquatic life (Kivi, 2010).
What is the cause of contamination of aquatic plants and fishes in water?
Water contamination is the outcome of human activities such as urbanization, industrialization, and agricultural activities. The overuse of pesticides and fertilizers and sewage from residential and industrial areas ultimately find its way to aquatic environment.
Which two of the above were the main causes of fish mortality in the lake?
Consider the following reasons for this. (i) Lots of urea and phosphate fertiliser were used in the crops in the vicinity. (ii) The area was sprayed with DDT by an aircraft.
What happens to fish in polluted water?
Water Pollution Harms Fish Population When nutrients wash into waterways through storm runoff, they deplete oxygen in the water that fish need to survive. Exposure to heavy metals can impair a fish’s ability to smell, disrupting its ability to locate food and protect itself from predatory animals and fish.
How are fish affected by pollution?
Pollution can directly kill or harm fish, or change the makeup of the fish’ surroundings, killing off sources of food or causing plant or algae overgrowth that starve the fish of oxygen.
How are fish populations affected by water pollution?
Water pollution harms fish populations in various ways. When nutrients wash into waterways through storm runoff, they deplete oxygen in the water that fish need to survive. Nitrogen and phosphorus typically enter streams and lakes from fertilizers, dog waste, and other sources. Over time, these nutrients build up in the water and promote algae
What causes fish to die in the water?
What causes fish kills? Many, but not all, fish kills in the summer result from low concentrations of dissolved oxygen in the water. Fish, like all other complex life forms, need oxygen to survive. They get theirs in the form of oxygen gas dissolved in the water.
Why are there so many fish kills in the summer?
Many, but not all, fish kills in the summer result from low concentrations of dissolved oxygen in the water. Fish, like all other complex life forms, need oxygen to survive. They get theirs in the form of oxygen gas dissolved in the water.
What are the major causes of water pollution?
The main causes for water pollution are : This waste includes sewage, garbage and liquid waste from factories and homes. Wastages from chemical factories contain many toxic or poisonous chemicals. These are discharged into rivers. The river-water becomes poisonous for fish and other aquatic animals and plants.