Causes of fish kills.
The hippopotamus, one of the animals of Africa, is the largest terrestrial herbivorous mammal in the world. However, in addition to their massive size and strong muscles, hippos poop is incredibly threatening. Among Africa's many lakes and rivers, hippopotamus populations are on the rise. They feed on a large number of fruits and herbs, and the amount of food they consume each day is staggering, which means that they excrete a large amount of feces every day.
Once the hippopotamus droppings enter the water, it will cause a series of environmental problems, the most serious of which is the mass death of fish. So, what is it that causes hippopotamus droppings to have such a severe impact on fish ecosystems? Hippopotamus feces are rich in organic matter, such as cellulose and protein. When these organic substances enter the water, they rapidly degrade and trigger an explosive growth of bacteria and microorganisms in the water body. This rapidly increasing number of microorganisms will consume large amounts of oxygen, causing a sharp drop in dissolved oxygen in the water source. Fish, on the other hand, need adequate oxygen to breathe, and a lack of oxygen can make it impossible for them to survive. Hippos also carry nutrients such as nitrogen and phosphorus in their feces. When these nutrients accumulate excessively in the water, they can trigger large-scale algae blooms. The overgrowth of algae not only makes the water turbid, but also obstructs the passage of light and affects the normal growth of plants in the water. This makes it impossible for the fish to find enough food, which leads to death. Hippopotamus droppings can also change the pH of the water body, making it more acidic. An excessively acidic environment not only directly endangers the health of fish, but also negatively affects the living conditions of other organisms in the water.
How to solve this problem?
Fish kills from hippopotamus droppings are not inevitable. On the one hand, people can reduce the pollution of water bodies by hippo manure by rationally managing water sources near feedlots and ecological reserves. On the other hand, scientists are also working hard to find out how to effectively deal with the environmental problems caused by hippopotamus droppings. For example, some countries have begun to implement biofiltration systems to treat hippopotamus droppings. This system uses the symbiosis of aquatic plants and microorganisms to degrade organic matter and purify the water body. In addition, increased public education and awareness can also raise awareness of the seriousness of the problem and reduce disturbance to hippopotamus populations in order to protect the habitat of fish species.
Epilogue. 
The harm of hippopotamus feces to aquatic organisms and ecosystems cannot be ignored. We need to take effective measures to reduce its impact on the environment and protect the ecological balance. Through scientific management and public participation, we are confident that we can solve this problem. So, in your opinion, how can we better protect hippos and their habitats? Looking forward to your views and suggestions!