Frequent question: What do you know about fishes?

A fish is an animal which lives and breathes in water. All fish are vertebrates (have a backbone) and most breathe through gills and have fins and scales. Fish make up about half of all known vertebrate species. Fish have been on the earth for more than 500 million years.

What are 5 characteristics of fish?

5 Characteristics That All Fish Have in Common

  • All Fish Are Cold-Blooded. All fish are cold-blooded, which is also called ectothermic. …
  • Water Habitat. Another shared characteristic amongst all fish is that they live in water. …
  • Gills to Breathe. …
  • Swim Bladders. …
  • Fins for Movement.


What are 5 interesting facts about fish?

fun Facts About Fish

  • There are over 30,000 different species of fish.
  • Fish have vertebrae.
  • Jellyfish, Starfish and Crayfish aren’t really fish.
  • Fish breathe with gills.
  • Fish swim with fins.
  • Fish have scales.
  • Fish talk to each other.
  • Fish have small brains.


What do you know about fish kids?

They are all vertebrates, which means that they have a backbone. They are cold-blooded, which means that their body temperature changes along with the temperature of their surroundings. Fish generally breathe through organs called gills. They usually have pairs of fins in place of arms and legs.

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What are 10 characteristics of fish?

10 Essential Facts About Fish

  • of 10. There Are Three Main Fish Groups. …
  • of 10. All Fish Are Equipped With Gills. …
  • of 10. Fish Were the World’s First Vertebrate Animals. …
  • of 10. Most Fish Are Cold-Blooded. …
  • of 10. Fish Are Oviparous Rather Than Viviparous. …
  • of 10. Many Fish Are Equipped With Swim Bladders. …
  • of 10. …
  • of 10.


What are the qualities of a good fish?

Common criteria for choosing fish

  • The body of the fish must be rigid or arched.
  • The fish should be bright, with a metallic luster.
  • The eye should be bright, vivid, and brilliant.
  • The gills should be bright, wet, pink or red.
  • The smell should be pleasant and mild.
  • Scales should be shiny and not detach themselves.

What is the world’s most common fish?

The World’s Most Common Types of Fish

Rank Fish Commercial Harvest
1 Grass carp 5,028,661
2 Peruvian anchoveta 4,692,855
3 Silver carp 4,189,578
4 Common carp 3,791,913

What is a fun fact about fish?

Fish typically have quite small brains relative to body size compared with other vertebrates, typically one-fifteenth (0.06 per cent) the brain mass of a similarly sized bird or mammal.

What is the loudest fish?

It’s official: Gulf corvina are the loudest fish on the planet, according to new research published today in Biology Letters.

What does fish use for protection?

When they sense danger they fill their stomachs with water (or air if they are out of water). This exposes sharp spines that cover their bodies. This makes them less inviting for predators to catch. Their skin and some internal organs contain tetrodotoxins, which are highly toxic substances.

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Can fishes feel pain?

“Fish do feel pain. It’s likely different from what humans feel, but it is still a kind of pain.” At the anatomical level, fish have neurons known as nociceptors, which detect potential harm, such as high temperatures, intense pressure, and caustic chemicals.

What is the best pet fish for a child?

We have compiled a top 10 list of the best fish for kids. Your kids will love caring for each of these popular species.

  • Guppies. Kids love colors. …
  • Neon Tetra. …
  • Angelfish. …
  • Kuhli Loaches. …
  • Yoyo Loach. …
  • Dwarf Gourami. …
  • Mollies. …
  • Swordtails.

What do fish all have in common?

Fish belong to a class of creatures called aquatic vertebrates. Their combination of gills, fins and the fact that they live only in the water make fish different from all other animals. Most fish have a skeleton made of bone but some, like sharks, have a skeleton made of cartilage.

What is the personality of a fish?

Fish are sociable, have personalities and are leaders and followers, research has found. Sociable fish suppress their own personality and conform when with a partner, new research has found.

What are the three main classes of fish?

Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes), and superclass Osteichthyes (bony fishes). The latter two groups are included within the infraphylum Gnathostomata, a category containing all jawed vertebrates.

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