How to Reportion Frozen Fish Food




We have a single Percula Clown Fish that seems to like frozen brine shrimp a lot. The problem is that the portions that the brine shrimp come in are way too big and unmanageable. The shrimp come in frozen, 1 cm cubes that need to be cut apart either with scissors or a knife, or smashed with your fingers when they melt a little. Not feeding the fish a consistent amount ended up causing an overfeeding problem.

Step 1: Supplies

You'll need some supplies in addition to the frozen fish food.

Waffle pattern mold:
I used a silicone pot holder with a grid pattern that I got from Bed Bath and Beyond. They don't seem to carry it online but here's the same one from Amazon.

Flavor injector:
Get a cheap flavor injector anywhere you can. A simple syringe will work but make sure it has a large diameter so the shrimp don't clog up the needle. Bed Bath and beyond

Cutters or sharp scissors:
You'll need these to cut the beveled tip off of the flavor injector needle.

Small container:
To hold the melted shrimp mixture.
I'm using a shot glass.

Frozen brine shrimp:
Purchased from Petco.

One or more fish to feed:

Step 2: Prep

Prep all your equipment. I started by cutting the beveled tip off of the flavor injector needle so I can get all of the shrimp out of the container.

I also washed everything to make sure there isn't any contaminants from the manufacturing process of any of the new items.

Step 3: Prep Continued

Prep the shrimp. Place a small amount of warm water in your container and then add one cube of the frozen shrimp. I make small batches because it seems to last a long time but feel free to make larger batch if you have the need. Swirl the container around to melt the cube. If you put too much water in, don't worry. After the cube has melted, set the container aside.

Now we're going to remove the extra water that we used to melt the shrimp so we more concentrated cubes. You could also skip this step by just letting the frozen cube melt down on its own. Get your flavor injector and reassemble it if you haven't already done so and your silicone pot holder. Put the pot holder on a flat surface, preferably near the sink.

Now grab your flavor injector and push the plunger to the bottom. Pick up the container with the melted shrimp in the other hand. Tilt the container slightly and with the needle, suck off the clear layer of water, using your thumb to pull the plunger up. If you pull up some of the shrimp, just gently squirt them back in and try again. Squirt the water you've removed into the sink. Once you've removed the extra water we're ready to make some shrimp ice cubes!

Step 4: Suck It!

Using the flavor injector, push out all the air with the plunger and then suck up all the shrimp from your container. Now using the silicone pot holder as your ice cube tray, fill the squares with your needle. If you put too much in, put the needle back in and suck the extra out. Repeat till the syringe is empty.

Step 5: Freeze 'em

Carefully place your pot holder into your freezer. Let them sit for a half hour or more to set up.

After they've frozen up, it's time to de-mold them. Grab your storage container and flip the pot holder over and pop your mini shrimp cubes into the container.

Step 6: Summary

Test your new shrimp popsicles on your fish! Hopefully my first instructable was helpful to someone. Enjoy.

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    10 Discussions


    11 years ago on Introduction

    They also make smaller cubes, but they are harder to come by. another way to do this is to unthaw the entire cube into a shot glass mixed with some aquarium water (fresh or salt) and use what you need then re-freeze it, it works fine as long as it does not get too warm or stay warm for a long period of time. Also has anyone tried to grow brine shrimp?

    2 replies

    Reply 4 years ago on Introduction

    Growing brine to adulthood takes some work, but many agree that bbs (baby brine shrimp) are a better source of food. They are VERY small though so you can feed thousands a day. There are a few retail and more than one DIY design for a brine shrimp hatchery. You can buy a little bottle of eggs that has hundreds of thousands (more likely millions). Hatching them is easy, feeding them is also easy. This is not a replacement food though, but it's a good secondary food source, or for specific breeds of fish that won't eat larger or non-living food.


    Reply 11 years ago on Introduction

    I thought about growing sea monkeys but it seemed like another tank to clean.


    Awesome! I can use that same method with daphnia for baby fishies. Doesn't seem like it would work with blood worms though, since they're too big. When I feed my dwarf puffers, I thaw a cube out, feed them the correct amount, then put the rest in the fridge, they hold up for a few days just fine.


    10 years ago on Introduction

    That's a very comprehensive and informative guide which I think deserve all the credit it can get. Sometimes I do face the same problem as well and I use different approach like searching for smaller frozen brine shrimp cubes that is only half a centimeter sold in certain pet stores but they cost a lot more than bigger sized cube. Now that you've provided a solution, I'll definitely try it out and I believe it will avoid all the hassles I encountered previously. You can also check out my aquarium fish blog which I use as a platform to share related information about fish keeping.


    10 years ago on Introduction

    i have pufferfish too but i just pop out a cube and cut it with a razor blade to the size that i need, then put the extra back in the square i popped it out of, seal it back up and put it back in the freezer. this is a cool instructable though!!

    1 reply

    10 years ago on Step 6

    Don't know why I didn't think of it sooner - thanks! Our dwarf puffers eat frozen blood worms and we've had the same problem with over feeding and messy deconstruction of these cubes to try and get the right amount. Will definitely be trying this out! : )


    11 years ago on Introduction

    Very Cool! I have to cut them in half most of the time! Great Instructable!