How Many Species of Fish Are There in the World in 2018?

Introduction

Sobat Penurut, have you ever wondered how many different species of fish there are in the world? As of 2018, there are over 33,000 known species of fish, with more being discovered every year. They come in all shapes and sizes, from tiny guppies to massive whalesharks. In this article, we will explore the world of fish and answer some of the most common questions about them.

What are Fish?

Fish are aquatic vertebrates that breathe through gills and have fins for swimming. They are found in almost every body of water on the planet, from oceans to rivers to tiny streams. Fish are an important part of many ecosystems and are also a popular food source for humans. Let’s take a closer look at the different types of fish and how they are classified.

Types of Fish

There are three main types of fish: jawless fish, cartilaginous fish, and bony fish.

Jawless Fish

Jawless fish are the most primitive type of fish and include lampreys and hagfish. They are called jawless because they do not have true jaws like other fish do. Instead, they have a round mouth with many small teeth that they use to scrape food from the sides of other fish.

Cartilaginous Fish

Cartilaginous fish include sharks, rays, and skates. They are called cartilaginous because their skeletons are made of cartilage instead of bone. Cartilaginous fish are some of the most ancient and well-adapted creatures in the ocean, with sharp senses and powerful jaws.

Bony Fish

Bony fish make up the majority of fish species and include everything from tiny minnows to massive tuna. They have a bony skeleton and swim bladder to control their buoyancy. Bony fish can be further divided into two types: ray-finned fish and lobe-finned fish.

Ray-finned Fish

Ray-finned fish are the most diverse and abundant type of bony fish, with over 30,000 species. They have thin, flexible fins that are supported by bony spines called rays. Examples of ray-finned fish include salmon, trout, and goldfish.

Lobe-finned Fish

Lobe-finned fish are a much rarer type of bony fish, with only eight living species. They have fleshy fins with a central bone structure that is similar to the limbs of land animals. Lobe-finned fish are thought to be the ancestors of all land vertebrates, including humans.

How Many Species of Fish Are There?

As of 2018, there are over 33,000 known species of fish. However, this number is constantly changing as new species are discovered and old ones are reclassified. In fact, scientists estimate that there may be as many as 2 million species of fish in the world, most of which have not yet been discovered.

Where Are Fish Found?

Fish are found in almost every body of water on the planet, from oceans to rivers to tiny streams. Different types of fish prefer different environments, such as saltwater vs. freshwater or warm vs. cold water. Some fish, like salmon, migrate long distances to breed and feed.

What Do Fish Eat?

Fish are a diverse group of animals, and their diets can vary widely depending on the species. Some fish are herbivores and feed on plants, while others are carnivores and feed on other fish or small animals. Still others are omnivores and eat both plants and animals.

How Are Fish Classified?

Fish are classified based on their anatomy, behavior, and genetics. The most common classification system is based on the Linnaean hierarchy, which groups organisms into Kingdom, Phylum, Class, Order, Family, Genus, and Species.

Why Are Fish Important?

Fish are an important part of many ecosystems and provide food and livelihoods for millions of people around the world. They are also important for scientific research and have contributed to many medical breakthroughs.

Table of Fish Species

Kingdom Phylum Class Order Family Genus Species
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus bahianus
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus coeruleus
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus leucosternon
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus nigricans
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus olivaceus
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus pyroferus
Animalia Chordata Actinopterygii Acanthuriformes Acanthuridae Acanthurus Acanthurus sohal

FAQs About Fish

1. What is the biggest fish in the world?

The biggest fish in the world is the whale shark, which can grow up to 40 feet long and weigh over 20 tons.

2. How long do fish live?

The lifespan of fish varies widely depending on the species. Some fish, like goldfish, can live up to 20 years, while others, like salmon, only live for a few years.

3. Can fish breathe air?

Some fish, like lungfish and catfish, can breathe air in addition to water. This helps them survive in environments with low oxygen levels.

4. How do fish swim?

Fish swim by moving their tails from side to side, which propels them forward through the water. They also use their fins to steer and balance themselves.

5. Why do fish school?

Fish school to protect themselves from predators and to increase their chances of finding food. Swimming in a group also helps them conserve energy.

6. Can fish feel pain?

There is some debate among scientists about whether or not fish can feel pain. However, many studies have shown that fish do have the ability to experience pain and discomfort.

7. How do fish communicate?

Fish communicate with each other through a variety of methods, including visual signals, sounds, and chemical signals.

8. What is the most expensive fish in the world?

The most expensive fish in the world is the bluefin tuna, which can sell for millions of dollars at auction.

9. How do fish reproduce?

Fish reproduce by laying eggs, which are fertilized by the male. Some fish, like salmon, migrate long distances to breed and lay their eggs in freshwater streams.

10. How do fish see?

Fish have eyes that are adapted to see underwater. They can see colors and shapes, but their vision is not as clear as that of humans.

11. What is a fish’s favorite food?

A fish’s favorite food depends on the species. Some fish prefer to eat plants, while others prefer to eat other fish or small animals.

12. How do fish stay in one place in the water?

Many fish have a swim bladder, which is a gas-filled sac that helps them control their buoyancy and stay in one place in the water.

13. Why are some fish poisonous?

Some fish have evolved to be poisonous as a defense mechanism against predators. The toxins in their flesh can cause illness or death in animals that try to eat them.

Conclusion

Nah, now that you know more about the world of fish, we hope you have a newfound appreciation for these fascinating creatures. Whether you’re a fisherman, a marine biologist, or just a curious observer, there is always more to learn about the world of fish. So get out there and explore!

Remember, it’s important to protect our oceans and the creatures that live in them. By respecting marine life and practicing sustainable fishing practices, we can help ensure that future generations can continue to enjoy the wonders of the sea.

If you have any questions or comments about this article, please feel free to leave them below.

Disclaimer

Mimin has attempted to ensure the accuracy of the information contained in this article. However, this article is for informational purposes only and should not be used as a substitute for professional advice. Mimin is not responsible for any errors or omissions, or for any actions taken based on the information contained herein.