What Species Do Fish Belong To


Salam Sobat Penurut! Are you curious about the species that fish belong to? Well, look no further because in this article, we will explore the various species of fish and their characteristics. Fish are fascinating creatures that have existed for millions of years and continue to thrive in our oceans, rivers, and lakes. Understanding their taxonomy is crucial for conservation efforts and the management of aquatic ecosystems. Let’s dive in!

What is Taxonomy?

Before we delve into the different species of fish, let’s first understand what taxonomy is. Taxonomy is the science of categorizing and naming organisms based on their characteristics and evolutionary history. It helps scientists organize and classify living organisms into groups or taxa based on their similarities and differences.

Taxonomy is hierarchical, meaning that each group of organisms is placed within a larger group. The hierarchy of taxonomy is as follows: Kingdom, Phylum, Class, Order, Family, Genus, and Species. The species is the most specific level of taxonomy and refers to a group of organisms that can interbreed and produce viable offspring.

The Kingdom Animalia

The Kingdom Animalia is the largest and most diverse group of organisms on Earth. It consists of all animals, including fish. Animals in this kingdom share certain characteristics such as the ability to move, reproduce sexually, and consume food through ingestion. The Kingdom Animalia is further divided into several phyla, one of which is the Chordata phylum.

The Chordata Phylum

The Chordata phylum consists of animals that have a notochord, dorsal nerve cord, pharyngeal slits, and a post-anal tail during their embryonic development. Fish belong to the Chordata phylum and are further divided into several classes.

The Fish Class

Fish are aquatic vertebrates that breathe through gills and have fins for swimming. They are cold-blooded and have scales covering their skin. The fish class is divided into three subclasses: the Agnatha, Chondrichthyes, and Osteichthyes.

The Agnatha Subclass

The Agnatha subclass consists of jawless fish that lack paired fins and scales. They include hagfish and lampreys, which are primitive fish that have retained many characteristics of their ancestors.

The Chondrichthyes Subclass

The Chondrichthyes subclass consists of cartilaginous fish, which have a skeleton made of cartilage rather than bone. They include sharks, rays, and skates, and are known for their sharp teeth and streamlined bodies.

The Osteichthyes Subclass

The Osteichthyes subclass consists of bony fish, which have a skeleton made of bone. They are the largest and most diverse group of fish and can be found in both freshwater and saltwater habitats. Bony fish can be further divided into several groups, including ray-finned fish and lobe-finned fish.

What Are the Different Species of Fish?

There are over 34,000 species of fish in the world, and they are classified into different families, genera, and species. Here are some examples of the different species of fish:

The Salmonidae Family

The Salmonidae family consists of fish that are found in freshwater and saltwater habitats. They include salmon, trout, and char and are known for their anadromous life cycle, which means that they hatch in freshwater, migrate to the ocean, and then return to freshwater to spawn.

The Cyprinidae Family

The Cyprinidae family consists of freshwater fish that are found in rivers, streams, and ponds. They include carp, minnows, and goldfish and are known for their small size and adaptability.

The Carcharhinidae Family

The Carcharhinidae family consists of sharks that are found in warm, tropical waters. They include tiger sharks, bull sharks, and blacktip sharks and are known for their sharp teeth and aggressive behavior.

The Scombridae Family

The Scombridae family consists of fish that are found in open ocean habitats. They include tuna, mackerel, and bonito and are known for their streamlined bodies and high-speed swimming capabilities.

The Centrarchidae Family

The Centrarchidae family consists of freshwater fish that are found in North America. They include bass, sunfish, and crappie and are popular game fish due to their large size and fight.

The Gobiidae Family

The Gobiidae family consists of small, bottom-dwelling fish that are found in both freshwater and saltwater habitats. They include gobies and are known for their unique adaptations, such as the ability to breathe air and climb rocks.


What is the difference between a fish and a mammal?

While both fish and mammals are vertebrates, they have several differences. Fish have gills for breathing, while mammals have lungs. Fish are cold-blooded, while mammals are warm-blooded. Fish lay eggs, while mammals give birth to live young.

Can fish interbreed with other species?

No, fish can only interbreed with members of the same species. This is because the genetic information between different species is too different to produce viable offspring.

What is the largest species of fish?

The largest species of fish is the whale shark, which can grow up to 40 feet in length and weigh up to 20,000 pounds.

What is the smallest species of fish?

The smallest species of fish is the Paedocypris fish, which is found in Indonesia and measures less than 1/3 of an inch in length.

What is the most common species of fish?

The most common species of fish is the bristle mouth fish, which is found in all of the world’s oceans and is estimated to make up more than half of all fish biomass.

Can fish hear?

Yes, fish have a sense of hearing and can detect sound through their lateral line system.

Do all fish have scales?

No, not all fish have scales. Jawless fish, such as hagfish and lampreys, lack scales.

What is the lifespan of a fish?

The lifespan of a fish varies depending on the species. Some fish, like goldfish, can live up to 30 years, while others, like salmon, only live for a few years.

What is the purpose of a fish’s scales?

The purpose of a fish’s scales is to provide protection from predators, reduce drag in the water, and regulate body temperature.

What is the difference between a ray-finned fish and a lobe-finned fish?

Ray-finned fish have fins that are supported by bony rays, while lobe-finned fish have fleshy fins that are supported by a central bone. Lobe-finned fish are more closely related to amphibians than ray-finned fish.

What is the most expensive species of fish?

The most expensive species of fish is the bluefin tuna, which can fetch prices of over $1 million at auction due to its high demand in sushi restaurants.

Are all fish edible?

No, not all fish are edible. Some species of fish can be toxic or contain high levels of mercury, which can be harmful to humans.

What is the difference between freshwater and saltwater fish?

Freshwater fish live in freshwater habitats such as rivers, streams, and ponds, while saltwater fish live in saltwater habitats such as oceans and seas.

Can fish feel pain?

The ability of fish to feel pain is still a topic of debate among scientists. While fish lack the same nervous system as mammals, they do have nociceptors, which are sensory receptors that respond to harmful stimuli.


Nah, now you know the different species of fish and their characteristics. Fish are an important part of our ecosystem and play a crucial role in maintaining aquatic biodiversity. It’s important to understand their taxonomy in order to properly manage and conserve their populations for future generations. Let’s do our part in protecting these fascinating creatures!

Take Action Now!

1. Learn more about the different species of fish in your local area and their conservation status.

2. Support sustainable fishing practices by purchasing seafood from certified sustainable sources.

3. Reduce your plastic use and properly dispose of any trash to prevent pollution in aquatic habitats.


This article is for informational purposes only and should not be used as a substitute for professional advice. The author and publisher disclaim any liability or responsibility for any loss or damage incurred as a result of the use of this information.

Kingdom Animalia
Phylum Chordata
Class Fish
Subclasses Agnatha, Chondrichthyes, Osteichthyes
Number of Fish Species Over 34,000
Most Common Fish Species Bristle Mouth Fish
Largest Fish Species Whale Shark
Smallest Fish Species Paedocypris Fish