The fish are made from the most famous organisms. They are also aquatic animals that have gills and are characterized by the fact that they do not contain any kind of fingers in their limbs. Fish are characterized by their ability to adapt to different temperatures. The most famous of these fish is the white shark and fish tuna.
It is noted that most fish species have bones and some of them have arches such as sharks, and vary weights of fish, for example we note that there are fish weighing less than a kilogram, while note that some others weigh about 15 tons, and we will learn through this article On the most important characteristics and characteristics of fish.
Fish are among the most famous and important human resources in all countries of the world. Fish are considered to be the main and basic foods of many people. It is cultivated in many different ponds and ocean cages, and the purpose of fishing is different. Some fish eat it as a main food, or to keep it in the public ponds.
The most important characteristics of fish
Fish are characterized by certain characteristics that distinguish them from other organisms that enable them to live in water naturally. The most important characteristics of fish include:
1 – Fish are characterized by the ability to adapt to different temperatures, it is noted that the temperature of the body varies with different places, and also vary the temperature of the areas of water, which is the main reason that made the fish adapt to all places that they live out, so they are distinguished from other birds and mammals.
2. Fish are both aquatic and aquatic animals and are capable of living in water permanently
3 – Fish also have the presence of appendages on their bodies and known as the benefits of fins are members that play an important role in balancing fish in water and facilitate the process of swimming and swimming.
Some species of fish are free from any crusts. They have thin bodies such as bonefish and sometimes have solid bodies such as cartilaginous fish.
5 – Fish can breathe from the oxygen dissolved in water, and through the gills, which is characterized by the presence of some capillaries in them.
6. The body of the fish has a sideline containing the sensory cells to identify the underlying sound waves.
7. Bonefish are characterized by three chambers in their heart and four in cartilaginous fish.
8 – Fish multiply by laying eggs, where the fish put a lot of eggs in order to be able to overcome all the difficult conditions that may be exposed to eggs while placed under the water.
9. Fish senses vary according to their nature. For example, fish that live near the surface of the water are characterized by small animals, but if the fish are deep, they have large-sized eyes that help them capture deep-sea light , And fish are characterized as having one eye on each side of the fish head.
10. Fish are characterized by strong sniffing. For example, sharks are able to sniff the blood in the sea and help them identify their victims and approach prey.