Write a news report about the dangers faced by the fishes in our rivers and seas
Answers
Untreated sewage effluent and agricultural run-off carrying fertilizers are examples of human-caused eutrophication. Eutrophication generally promotes excessive plant growth and decay, favouring simple algae and plankton over other more complicated plants, and causes a lack of oxygen needed for fish and shellfish to survive.
Fish kills in bayous, streams, and other freshwater habitats are often caused by oxygen depletion associated with excessive levels of fertility and algae. Like most plants, many algae produce oxygen during the daylight as a by-product of photosynthesis. At night these algae consume oxygen, but usually much less than was produced during the daylight. Many common situations, however, can reduce the amount of oxygen a bloom produces without reducing its nighttime oxygen demand. Extremely calm or cloudy days may reduce photosynthesis and oxygen production. This type of oxygen depletion may kill fish directly or weaken their immune systems through prolonged stress.
hi mate,
according to news the National Academy of Sciences estimated that ocean-based sources, such as cargo ships and cruise liners had dumped 14 billion pounds of garbage into the ocean. Over 1 million seabirds and 100,000 sea mammals are killed by pollution every year.
Water pollution harms fish populations in various ways. ... Algal blooms can be harmful to fish as they feed upon algae, toxins accumulate within the fish, and when a predator fish consumes that fish, they too are consuming higher toxin levels.
If untreated water keeps getting pumped into the lakes, it would soon contaminate groundwater resources, as is evident from the higher nitrate levels in the borewells in the vicinity of polluted lakes in Bengaluru. ... The fish would have got very weak because of the ammonia,” says Jamwal, who studies water pollution.
I hope it helps you.