In today’s topic, we will discuss some informative and exciting characteristics of fish. Very few people know how to keep fish at home happy and healthy? So let start our today’s topic.
Fish are diverse. Talking about the characteristics of fish, each species of fish has evolved to live successfully in the underwater environment, from streams and lakes to the vast expanse of the ocean. According to FishBase, fish are the most diverse animal species among the vertebrates, with 32,000 different types of fish, a comprehensive database of fish used by researchers and zoologists.
Despite the thousands of species with different characteristics, all fish share some standard features that help them thrive in their watery domain. While some rare exceptions to these rules, below is a list of the traits common across these aquatic animals.
Common Characteristics Of Fish
Here we are going to discuss some common characteristics of fish.
- They Are Cold Blooded
- They Breathe Through Gills
- Live In The Water
- They Have Swim Bladder
All fish are cold-blooded.
These are the most important characteristics of fish. Due to their cold-blooded feature, these fish are also called ectothermic. Fish cannot regulate their body temperature if they rely entirely on the outside environment for temperature regulation. The body temperature of fish changes along with the evolution of the environment’s temperature.
Many fish species are susceptible to temperature changes, and they can only exist in specific water temperatures. Other species can survive in broader temperature ranges.
The body temperature of the fish fluctuates as to the water’s temperature around them. As a result, colder waters decrease a fish’s body temperature.
They Breathe Through Gills
Among various common characteristics of fish, having gills are also crucial to classified any animal as fish. Fish always breathe through gills. Gills are a necessity to live and breathe underwater. Gills help fish absorb oxygen from water and release carbon dioxide, allowing them to breathe underwater.
Typically all fish have gills, but some species of fish living in extremely oxygen-depleted environments have developed lungs as well.
As with living in water, all fish have gills, but not everything is a fish. Fish have gills throughout their lifespan, while other species that have gills often lose them at some point. Tadpoles, for example, have gills but eventually lose them as they metamorphose into frogs.
Live In The WaterOne of the standard and shared characteristics of fish is that they live in water. For every species of fish, this may seem too pronounced to be worth stating. However, some fish can spend significant amounts of time out of the water. Usually, fishes do not have lungs, but this is one of the most considering characteristics of fish. They can breathe through their skin and keep their gills moist with water that they store internally.
Something to note here is that while all fish live in water, not everything that lives in water is a fish. Whales and dolphins, for example, are mammals. Turtles live in water, too, but they’re reptiles, not fish.
- They Have Swim Bladders
All fish have a bladder for swimming, a specialized organ filled with air that helps ensure fish maintain a stable condition in the water, neither sinking nor floating too much.
That is also one of the most common characteristics of the fish: the presence of a swim bladder. The swim bladder keeps fish stable even in a sleeping position and prevents them from sinking to the bottom of their habitat. In some species of fish, the air is swallowed and sent to the swim bladder. This adaptation also helps the fish to survive in waters that do not have adequate levels of oxygen.
Some Other Characteristics Of Fish
In this part, we will discuss some other characteristics of fish that are not so common, but you may find if you keep them as pets.
- They Are Genious As Pets
Many researcher’s research shows that fish recognize each other. They are capable of remembering the past social interactions that they have had with other fish, and they show affection by rubbing against each other.
- They Are Sensitive
Fish also have sensitive nervous systems and react to painful stimuli the way all animals do. Due to pain or any severe condition, their breathing rate increases, their muscles get stretched, where they try to escape.
- Fish Are The Most Socialized Pets
Another most considerable characteristics of fish are when they communicate and socialize with each other through a range of low-frequency sounds to communicate courtship, alarm, or submission.
- Can They Fly?
There are more than 25,000 species of fish, which is more than half of all known backboned animals. Some fishes can fly while others can climb trees. Some are even able to change from male to female and back again.