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The Craft Train

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You are here: Home / Crafts and Activities / Learning and science / Raising tadpoles: Creating an observation tank

Raising tadpoles: Creating an observation tank

April 18, 2020 By Kate 21 Comments

This post may contain affiliate links. I may receive commissions for purchases made through links in this post at no cost to you.

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Have you ever thought about raising tadpoles? It’s easy! In this blog post we’re sharing how we set up our tadpole to frog tank so the girls could see the incredible metamorphosis first hand at home.

This is a fun and engaging way for kids to learn about the lifecycle of a frog and is a fabulous addition to a unit on lifecycles or mini beasts.

This activity was first published in 2016 and has been updated and reshared for today’s audience

You might also like our frog on a lily pad craft

raising tadpoles into frogs to learn about the frog lifecycle

Everybody knows that tadpoles hatch from tiny eggs and then gradually change into jumping amphibians with lungs and four legs, but knowing this and actually seeing it happen are two completely different things. As our macro photos will testify the changes and different stages they go through are completely fascinating to watch – and not just for kids!

It’s possible to set this activity up for next to no cost. I know this because when I was about the same age as my own kids (albeit with a little more freedom) my sister and I used to walk down a bush track near our house, ice cream containers in hand, and scoop little tadpoles from the creek to keep as “pets”.

We filled our containers half-full with creek water and added a large rock for the ones which made it all the way to becoming frogs. I clearly remember how excited we got to see them growing legs, and if you had a little froglet in your container it was the most exciting thing ever!

I wanted my own girls to experience the magic of watching this transformation happen with their own eyes, but unfortunately I can’t bring myself to allow them traipse off into the bush on their own to catch tadpoles. Luckily I don’t need to though because we have a small pond in our back yard that the local frogs love to visit to lay their eggs in.

We hear the frogs more than see them because they are very clever at camouflage and hiding, but we have been lucky to spot them a few times.

If you’ve never seen frog eggs they look a lot like caviar and float like bubbles on top of the water. Every so often we find a batch of them floating on the surface of our pond, but at the time of this project there were none so we caught a few baby tadpoles instead.

frogs in their natural environment outside

As I have already explained, you don’t actually need to spend any money to do this project if you don’t want to and the kids will delight in it just as much. However, we thought that observing the changes that happen would be easier in a proper tank which is why this time around, instead of using an ice cream container, I invested in a few items from the local pet shop.

To set up an observation tank just like ours this is what you will need…

For our tadpole tank we used:

  • A plastic pet tank with a ventilated lid (medium size) – this is the kind of tank often used for pet mice or hermit crabs. We bought ours from our local pet supplies store but it looks exactly like this one here. It’s good to have the plastic lid because it allows in plenty of air but also stops them from hopping away once they get big enough
  • A bag of washed river rocks
  • A small water plant – we bought this on recommendation from the pet shop lady, and the frogs really seemed to love it. In addition to keeping their water healthy the plant also gives them a place to hide and lightly sit on once they have developed their lungs and need air to breathe.
  • Some water conditioner to make the tap water safe for them to swim in (the same as what you would use for regular goldfish). I have also read that you can put a bucket of water outside to sit for a couple of days and it will do the same job but we were too impatient for that!

Our experience of raising tadpoles into frogs

kids catching tadpoles

Once we had the tank set up and ready to go the girls caught some tadpoles by scooping them up in plastic containers. They were so little at first, they must have been not long hatched out of their eggs.

tadpole raising tank

As you can see we half-filled the tank and left some rocks and plant growth poking up from the top of the water. Once the tadpoles turn into froglets this is essential for their survival, but as young tadpoles they only need water and somewhere to hide. The large rocks we added came from the garden.

tadpoles growing bigger in tadpole raising tank

Feeding and cleaning the frog tank

Tadpoles are herbivores, so while they were small we fed them baby spinach leaves which had been rinsed and then microwaved on high for 20 seconds. Three leaves were enough to last a few days, and once they had all been eaten we added more. When they grew bigger they ate more and needed more frequent feeding.

feeding the tadpoles in the tank

When tadpoles become froglets they turn into carnivores, so they begin to rely on insects as their main source of food. Once our babies started looking more like frogs and less like tadpoles I began to add a scoop of living mosquito larvae from the surface of our pond into their tank as well as the baby spinach leaves.

I’m not a hundred percent sure if they ate the larvae or not because it took a long time to disappear. Still, it appeared to get eaten after a week or so of floating on the surface – either that or they turned into mozzies and flew off into our house!

At first the tank stayed clean for a long time and only needed scrubbing out every few weeks, but as the tadpoles grew bigger it got dirty quicker and this became a weekly task.

cleaning the tank

In order to clean the tank the girls helped me catch the tadpoles and place them in a container filled with a scoop of their tank water before completely emptying and scrubbing the dirty tank out. We added fresh tap water and more water conditioner before putting the tadpoles back into their home again.

Learn more about life cycles

 

Observing the tadpole to frog metamorphosis

Here is a tadpole which has grown back legs. Can you see his little arm forming beneath his skin?

tadpoles growing legs

Their skin was quite translucent which I had never realised before, so when we could see their tummies we could observe their intestines too! Notice how cleverly the tadpole camouflages himself to the pink sandstone rock in the image below.

tadpole camouflaged against a rock with translucent skin

It was truly interesting to observe and photograph the metamorphosis of these creatures. 

Some of these photographs have been taken using my Canon DSLR and some are iphone snaps using an olloclip to get up close (a clip on macro lens, which is fun to experiment with). 

tadpoles with front and back legs

Our tadpoles were all different sizes when we caught them so they were at different stages of development throughout the time that we were observing them. In total we had them in our house for around three months.

tadpole smiling at the camera

froglet swimming

Once our tadpoles lost their tail completely we released them back into our pond. This was something the girls really loved doing!

froglet in hands

froglet in hands

Seriously, how cute are they! 

Just in case you’re wondering, the frogs that we have been observing are striped marsh frogs which are common along the eastern coast of Australia and often found in suburban areas.

I’m not an animal expert at all so any questions I had whilst raising the tadpoles I directed them straight to my blogging buddy Penny from Mother Natured. She has also done this activity with her own kids and given away some of her valuable tips and knowledge here.

Have you kept tadpoles for observation before? Trust me, they’re more interesting to watch than TV – and I think even the kids will agree with that!

Setting up a tadpole tank

tadpole raising tank
Active Time 60 days 20 hours
Total Time 60 days 20 hours
Difficulty easy

Materials

  • Medium sized aquarium with a ventilated lid
  • River rocks
  • Aquarium plant (ask your pet shop which one suits frogs and tadpoles)
  • Large rocks
  • Water conditioner
  • Wilted spinach leaves, for feeding the tadpoles
  • Insect larve or fish food flakes for feeding the froglets

Instructions

  1. Wash the rocks and place them in the base of your aquarium
  2. Add a few large rocks for the frogs to sit on and the tadpoles to hide under
  3. Add tap water, measuring how many litres you are adding as you go. Fill so the tank is half filled with water and there are large rocks poking above the surface
  4. Add water conditioner to make the tap water safe for frogs. This can vary for the brand you are using so follow the instructions on the bottle for the amount of water in your tank
  5. Add an aquarium plant
  6. Add tadpoles
  7. As soon as the tadpoles have become tiny frogs, release them into their natural environment. It can take a full year for them to then turn into an adult sized frog

Notes

Feeding the tadpoles:

Rinse a few baby spinach leaves in tap water, then microwave on high for 20 seconds. Allow to cool before feeding them to your tadpoles. Once the spinach leaves have been eaten, add more. Initially this can take days, but as the tadpoles grow they eat more.

Feeding the froglets:

Frogs are carnivores and eat insects not leaves. You can catch live insect larvae by scooping it up from the surface of a pond or feed them flakes of fish food

Project Type: experiment / Category: Learning and science

More frog crafts and activities

  • Make a bouncy frog on a lilypad paper craft
  • Create a cute paper roll frog using this squish, cut and fold technique
  • Set up an outdoor frog habitat succulent garden 
  • This paper frog craft has been based on the Green Tree frog species from the Daintree Rainforest

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stamped rose card

Comments

  1. 1

    Pets forever says

    September 6, 2016 at 3:02 am

    Hi, I have a aquatic frog should I have a rock for it to sit on
    Or is it better to just keep in the water all the time thank you!

    Reply
    • 2

      Kate says

      September 12, 2016 at 12:42 am

      Hi, I really don’t know about that particular breed of frogs. As I mentioned in the post I am not an animal expert just a mum who wanted her kids to see frogs develop from tadpoles in a tank. Based on my limited experience and the breed of frogs we observed, they love to have rocks both as somewhere to hide as well as something to sit on to breathe air.

      Reply
  2. 3

    Lily says

    November 26, 2018 at 6:59 pm

    How do you know the tadpole species you are collecting are least concern rather than any other status which is illegal? You can only collect least concern eggs, tadpoles and frogs from your own property and have no more than 8 adults at a time. Also regarding your other comment frogs don’t have breeds they have species. Also you are holding a frog with dry hands it seems in that picture which is bad for them as they breathe through their skin and you can remove the protective slime coating they have

    Reply
    • 4

      Kate says

      November 29, 2018 at 3:32 pm

      Hi there. Thanks for the info, I don’t pretend to be an expert on frogs – I’m not. With this project I was merely encouraging my girls to appreciate frogs and learn more about their transformation by observation. In answer to the species question, I learned that these frogs were striped marsh frogs by looking them up and finding images on Wikipedia which look exactly like the ones which mature in our backyard pond, which is where we collected the tadpoles (not eggs) from. As soon as they were able to hop we released them back into the pond.

      Reply
    • 5

      Dan says

      September 12, 2020 at 12:30 pm

      Lily seems to have forgotten that is a great way for children to learn about animals. Kate mentioned they took the tadpoles from their own pond not from any public parks. It seems Lily is a negative person who has nothing better to do than write complaints about how people handle frogs and from where they get them. What are you, the frog police? Get a hobby Lily, instead of doing this to a great post. Thanks Kate for your efforts.

      Reply
      • 6

        Angela says

        September 27, 2020 at 3:49 am

        Yes, AGREED!!!

        Reply
    • 7

      Angela says

      September 27, 2020 at 3:04 am

      Wow SERIOUSLY? A mom simply shared a cute project that was a great learning experience as well and you come and berate her. OMG there is no shortage of RUDE people and ignorance. I think she did a fabulous job! I never understood why CERTAIN types of people always feel the need to interject some hate into something. A good rule is IF YOU DONT HAVE ANYTHING NICE TO SAY THEN SHUT UP. This mom made it clear she was no expert many times but you still felt the need to remark? These type of people (meaning you) think it makes them somehow feel superior when it actually makes you look the fool you are. I am currently doing this project with my granddaughter and this article was one of many I read that played a part in my set up. SHAME ON YOU! NO REALLY, SHAME ON YOU!

      Reply
  3. 8

    claire says

    April 30, 2020 at 1:12 am

    this is sooooo helpful!! thank you!

    Reply
    • 9

      Kate says

      April 30, 2020 at 6:18 am

      you’re welcome!

      Reply
  4. 10

    Abigail Kartzinel says

    June 9, 2020 at 2:29 am

    THANK YOU!!! My kids just found tadpoles and this was extremely helpful! Can you tell me approximately how many tadpoles you kept in that size habitat? My kids caught way more then we can raise and I’m trying to figure out how many to return to the pond!

    Reply
    • 11

      Kate says

      June 9, 2020 at 6:38 am

      I think we had around 10 but it was a while ago so I can’t remember for sure.

      Reply
  5. 12

    ellie says

    June 19, 2020 at 2:44 am

    how many tadpoles did you keep in the tank

    Reply
    • 13

      Kate says

      June 19, 2020 at 6:10 am

      About 10 from memory

      Reply
  6. 14

    Sarah says

    June 19, 2020 at 11:09 pm

    Did you have the tank inside the house or leave it outside?

    Reply
    • 15

      Kate says

      June 20, 2020 at 6:28 am

      We kept it indoors

      Reply
  7. 16

    Kaylie Carter says

    June 24, 2020 at 3:39 am

    What if you don’t have water conditioner for it and you can’t buy it?

    Reply
    • 17

      Kate says

      June 24, 2020 at 6:13 am

      You can also leave the water outside in the sun to sit for 24 hours (I’ve read). They should be OK. We top up our frog pond with tap water regularly.

      Reply
  8. 18

    julie carlson says

    June 26, 2020 at 10:43 am

    Hi, I know this post was from a while back. However, kindly, the comment that stated “how do you know you collected a species of least concern” I wanted to ensure to note the need for our future generations to learn about and appreciate frogs in order to protect them. The earths best advocates are those we put initiative into assisting them to learn.

    Reply
    • 19

      Sheila says

      August 23, 2020 at 6:15 am

      Julie, I couldn’t agree more! I have a tadpole aquarium now that I am “helping” my 6 year old granddaughter with. We have had a blast and we both have loved the experience of tending these babies, no matter their species!
      Like Kate, we will release them back into my water garden as soon as they mature which for several, won’t be long!
      Sincerely, Sheila

      Reply
  9. 20

    Ella says

    October 23, 2020 at 2:59 am

    I love tadpoles! Like so much! I have a lot of them in my pond! LOL!!!

    Reply
  10. 21

    Ella says

    October 23, 2020 at 3:03 am

    can tadpoles jump like frogs? I have wondering for a long time and i still do not know. It’s crazy! super crazy!

    Reply

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