10 characteristics of FISH

The fish are any of the more than 30,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world. Living species range from primitive, jawless lampreys and hawkfish through cartilaginous sharks, rays and rays to the abundant and diverse bony fish. Most fish species are cold-blooded; however, one species, the opah (Lampris guttatus)He's hot-blooded. In this article the main characteristics of the fish will be developed.

The term fish applies to a variety of vertebrates from various evolutionary lines.. Describes a life form rather than a taxonomic group. As members of the phylum Chordata, fish share certain characteristics with other vertebrates. These features are gill slits at some point in the life cycle, a notochord or skeletal support rod, a hollow dorsal nerve cord, and a tail. Let's look at more characteristics of the fish below.

Fish Characteristics

1. All fish have gills present from the moment they are born until they die. Gills are important organs for a fish, as they are how fish breathe. They help absorb oxygen from the water and emit carbon dioxide. The gills are located on each side of the fish's head.
2. Fish are ectothermic or cold-blooded species. They cannot regulate their body temperature and depend on the external environment for their heat. A fish's body temperature fluctuates according to the temperature of the water, and like lizards, cold water can cause them to sluggish. Some fish in colder bodies of water, such as lakes, will go dormant during the winter months. This is one of the most important fish characteristics.
3. Fish can detect nearby movement. Fish have a specialized sensory organ called the lateral line that runs the length of the body. Located just below the scales, it is made up of ducts that are filled with a fluid. The lateral line can detect vibrations and movements in the water. Even if there is no light, fish can detect food and predators, and even navigate with the help of this specialized organ.
   Swim bladders help fish sleep
4. All fish have a swim bladder., which is filled with air and helps ensure that the fish maintains a stable buoyancy in the water, without sinking or floating too much. The presence of a swim bladder allows fish to sleep in the water without sinking to the bottom of their habitat. In some species of fish, air is swallowed and sent to the swim bladder. This adaptation also helps fish survive in waters that do not have adequate levels of oxygen.
5. The fins are common to all fish.. The pectoral and pectoral fins allow the fish to maneuver and maintain stability while the dorsal and ventral fins reduce rolling motion as the fish swims and assist the fish during turns. The caudal fin propels the fish forward as it swims.



6. With thousands of species, the reproduction in fish it can be markedly different between different species. There is the seahorse, the only species in which the male gives birth. And then there are species like cod, in which the females release 3-9 million eggs into the water column. And then there are sharks. Some shark species are oviparous, which means they lay eggs. Others are viviparous and give birth to live young. Within these life-bearing species, some have a placenta, like human babies, and some do not.
7. Fish They are distributed in a wide variety of habitats., both marine and freshwater, worldwide. Fish have even been found as deep as 4.8 miles below the ocean surface.
   
8. Fish (in most cases) are designed with streamlined bodies which allow them to move quickly through the water and swim by moving their bodies and tails from left to right, while marine mammals such as whales, dolphins and porpoises swim by moving their tails and flakes up and down.
9. Lots of fish species too have evolved exoskeletons, or scales, to help protect them from predators. The purpose of the exoskeleton is to make it difficult for predators to penetrate its meat.
10. As a species, fish they can differ drastically in terms of size, speed, diet, function and habitat. Some examples include comparisons like the seahorse that moves at an average speed of 0.5 mph vs. the sailfish that can reach speeds of 70 mph. Another example is the Dwarfgoby fish which measures just 8-10mm in length compared to the Whale Shark which can reach a length of over 50ft.
    

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