There are many fish in the freshwaters of the United States, but not all of them are native. Its upper jaw contains two rows of very sharp teeth which have been used to attack humans. They can reach more than 3 meters in length and exceed 200 kilograms in weight. This fish is distributed throughout the eastern part of Central America. These shocks can be sustained for more than a minute and they are strong enough to kill a person. In order to hunt food, defend against predators and communicate, the electric eel can produce strong electric shocks generated from their head. Its danger lies in the fact the fish can create electrical energy. It doesn't even matter if the water is poorly oxygenated since they breathe air. They prefer muddy areas such as mudflats.
They live in South America in the Amazon and Orinoco rivers. Electric eel (Electrophorus electricus)ĭespite their name, the electric eel if not actually an eel. A large school of piranha, however, can kill even large animals trapped in the river in a matter of minutes. Although its jaws are very strong, a single piranha will be unlikely to inflict much damage. Piranha are a type of freshwater fish which inhabit the rivers of South America, such as the Amazon River and its tributaries. These fish include: Piranha (subfamily - Serrasalminae) However, in certain rivers, lakes and wetlands of the world lurk highly dangerous types of freshwater fish which can even cause death to people of the region. If we were to think of dangerous fish, our minds might go to the oceans where great white sharks and other intimidating sea creatures exist. Their kidneys are then needed to expel the leftover salt and maintain homeostasis. This is why saltwater fish take in a lot of water. When they breathe through their gills, a large amount of water is expelled. On the other hand, the excessive salinity of marine waters causes greater difficulty. Additionally, they have well-developed kidneys to properly filter the water. This means water can pass through the fish's gills and leave the operculum with less resistance. This is because the salinity of freshwater is not very high. An example is maintaining body temperature within a certain range.ĭifferent types of freshwater fish are able to maintain this equilibrium more easily since their external environment is more similar to their internal tissue. It is essentially a state which keeps physical and chemical changes in equilibrium. Homeostasis is the process by which a living organism keeps its vital biological processes stable, despite any changes which may occur in their environment. This will help us create the distinction between the two. In order to discuss the difference between types of marine and saltwater fish, we first need to define the term homeostasis.
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