Home > Facts, Figures & Trivia > Find Out About Fish and Sea Animals

Find Out About Fish and Sea Animals

By: Suzanne Elvidge BSc (hons), MSc - Updated: 24 Aug 2012 |
 
Find Out About Fish And Sea Animals

Fish and sea animals live in a very different environment to ours, and come in all shapes and sizes, from tiny to enormous.

Fun Fish Facts

Fish have been around for about 450 million years or more.

There are almost 27,000 different kinds (species) of fish, and fish are found all over the world, in fresh and salty water

There are more different kinds of fish than any other kinds of animals and birds put together.

Most fish have a swim bladder (a sac filled with air) inside them to keep them afloat – sharks do not, so they have to keep swimming, otherwise they sink.

Some fish have skeletons made of bone (bony fish) and some fish have skeletons made of cartilage (cartilaginous fish), like sharks and rays – people’s noses are made of cartilage.

Fish are cold-blooded.

Someone who studies fish is called an ichthyologist.

Fish do not have lungs, they have gills – as water passes over the gills, which have many blood vessels close to the surface, and the gills absorb oxygen and release waste carbon dioxide.

Some fish are slimy – this mucus protects their skin, makes them move through the water more quickly, and can keep predators (animals and other fish that want to eat them) away.

Cuttlefish can change colour to hide themselves from predators .

Only sharks have eyelids.

The whale shark can grown to 12.2 m long – some gobies are less than 1 cm long.

Fish and seafood is a very healthy food – in Great Britain, people bought more than 387,000 tonnes of fresh, frozen and canned seafood.

There are more than 10,500 fish and chip shops in the UK, selling 276 million portions of fish and chips each year.

About Sea Animals

Whales and dolphins are mammals, not fish.

There are 33 different kinds of seals worldwide, with two living in the UK.

Sea otters can eat up to 9 kg of food a day, and they have the densest fur of any mammals.

A male Northern elephant seal can dive for 20-35 minutes, a harbour seal for 3-7 minutes, a walrus for 10 minutes, a bottlenose dolphin for 8 minutes and a killer whale for 10 minutes.

Marine (sea) mammals can hold their breath for a long time by conserving oxygen – they have more blood and more oxygen-carrying red blood cells than humans, and can slow their heart rate and re-circulate their blood to vital organs, such as the heart, lungs and brain.

The body of a jellyfish is 90-94% water, and a group of jellyfish is called a ‘smack’.

The Lion’s Mane jellyfish has a body up to 2.3 m across and tentacles of up to 36.5 m long.

Male seahorses give birth to live young, and a group of seahorses is called a ‘herd’.

An octopus (plural octopi, octopuses or octopodes) uses a cloud of ink or changes colour to confuse predators and prey.

An octopus has four pairs of two arms, and can grow a new arm if one is injured.

The Romans used a dye made from a tropical sea snail, the ‘spiny dye-murex’, to dye cloth purple – the dye was very expensive and was used for ceremonial robes

Starfish have two stomachs, and most have five arms, with an eye at the end of each arm.

You might also like...
Share Your Story, Join the Discussion or Seek Advice..
Why not be the first to leave a comment for discussion, ask for advice or share your story...

If you'd like to ask a question one of our experts (workload permitting) or a helpful reader hopefully can help you... We also love comments and interesting stories

Title:
(never shown)
Firstname:
(never shown)
Surname:
(never shown)
Email:
(never shown)
Nickname:
(shown)
Comment:
Validate:
Enter word:
Topics
Latest Comments
  • simran panaich
    Re: Soap and Detergent Chemistry
    thnx!! It helped me a lot !!! THank YOu so much
    6 June 2019
  • Mar2
    Re: Why Oil and Water Don't Mix
    I am doing this as a demo for homogeneous mixture examples. It really helps, it is interesting, and thank you so much for it!!!
    5 June 2019
  • COOL STUDENT
    Re: Why Oil and Water Don't Mix
    Why does the food coloring mix with the water i did not quite get iy
    31 May 2019
  • EMILY BAKER
    Re: Looking at Soil Profiles
    This thing is stupid. I am a doctor and I know better then you do! I will do something about this website if you don’t change the…
    25 May 2019
  • Alice Picello
    Re: Looking at Soil Profiles
    THIS DIDN’T TEACH ME ANYTHING ON SOIL PROFILES
    25 May 2019
  • Rea
    Re: Making an Emulsion
    I have always wondered about the Earth. My teacher gave us this website to read about why water and oil don't mix. I started looking around on…
    16 May 2019
  • Candytashy
    Re: Looking at Soil Profiles
    Thanks so much for this post .it really helped me .made my homework much easier and l have learnt a lot from this post
    25 March 2019
  • Rajput
    Re: Pulling and Pushing: Magnetic Attraction
    Kya kisi chemical ko copper me mix karne se iron or steel ko push kiya ja sakte hai. Yadi ho to formula batye.
    25 March 2019
  • AT LIFE
    Re: Soap and Detergent Chemistry
    Thanks you so much because you help different students especially science who went be a perfect a part of chemistry
    22 March 2019
  • AT LIFE
    Re: Soap and Detergent Chemistry
    Thanks you so much because you help d/f students especially science who went be a perfect a part of chemistry like me.
    22 March 2019