Do Fish Drink Water?

Do Fish Drink Water?


If you have a pet, one of your jobs might
be to make sure that your pet has plenty of food and water… …unless, of course, your pet is a fish! You have to feed your fish, but you don’t
have to give them water — there’s water all around them! But do fish need to drink that water? Well, some fish do, but some don’t! It all depends on where they live. You probably already know that your body needs
water—for lots of reasons! It’s so important, in fact, that different
parts of your body work together to make sure that there’s about the same amount of water
inside of it at all times. If the amount of water gets too low, you get
thirsty, and grab a drink. And if the amount of water gets too high,
you get rid of the extra when you pee. Well, fish also need to keep the right amount
of water on the inside of their bodies. And the water outside of a fish’s body can
affect whether that fish needs to drink water, or not. Most fish live in one of two kinds of water. Some fish, called freshwater fish, live in
places where there’s no salt in the water— like lakes, ponds, and rivers. Other fish, called saltwater fish, live in
water that has lots of salt in it, like the ocean. Freshwater fish have an easier time keeping
the right amount of water inside of their bodies. That’s because water enters into a freshwater
fish’s body right through its gills. Gills are the body parts that fish use to
breathe. Fish breathe by pulling water into their mouths,
then pushing the water over their gills and out of their body. And in freshwater fish, gills also end up
taking in some of the water, and the fish ends up with more water in its body. So freshwater fish don’t really have to
drink water through their mouths like we do. These fish actually have to make sure they
don’t get too much water, and their body has to work very hard to get rid of the extra
water as waste. While freshwater fish get a lot of water in
through their gills…saltwater fish lose a lot of water through their gills. As water flows over a saltwater fish’s gills,
the salt that’s in the water outside of the fish’s body sucks out some of the water
that’s inside of the fish’s body through its gills. Since water is always moving over a fish’s
gills, that means water is always leaving a saltwater fish’s body. And that means that the fish that live in
saltwater need to drink—a lot. Most animals can’t drink salt water when
they’re thirsty, but these fish can! They gulp and swallow water almost constantly. Saltwater fish have a special system in their
bodies that takes salt and puts it back out into the ocean…and everything stays in balance! So, some fish need to drink water, and some
don’t…it just depends on where they live! Thanks for joining us here on SciShow Kids! Have a question for us here at the Fort? Grab a grownup and leave a comment down below,
or send us an email to [email protected]!

53 thoughts on “Do Fish Drink Water?

  1. Hey SciSchowkids can you make a video about planktons from oceans? And can you make a video about Stone Age? Thank you!!! From Mariah! I really enjoy learning in your videos

  2. I just came here from the regular Sci Show channel, and I just realized how downgraded and cringy everything is here.

  3. So you didn't tell us what fish doesn't need to drink water ? I guess every living thing on earth needs water so don't say some fish need to drink water some don't

  4. Thank you! Great information.
    1. What will happen to the fresh water fish if it is placed in salt water?
    2. What will happen to the salt water fish if it is placed in the fresh water?
    3. Salmon is borne in mountain stream and it will swim into the ocean when it is grown up. Is Salmon a fresh water fish or salt water fish?

  5. This is so amazing, and even as a 23 year old kid, I can surely say, I am learning and imagining quite a lot, thanks to these videos! 😛

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