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You are here: Home / Live foods / Daphnia / Daphnia as a Live Marine Aquarium Food
Daphnia are incredible little freshwater critters!

Daphnia as a Live Marine Aquarium Food

by Kenneth Wingerter

An Illustration of DaphniaDaphnia sp., widely known as water fleas, are hardly new to the aquarium scene. Freshwater aquarists (and perhaps quite a few saltwater aquarists too) have scooped them from ponds, ditches, etc. to use as aquarium feed for at least a century. Some particularly assiduous hobbyists have even found success culturing these tiny crustaceans for long periods of time by feeding them homemade green water. And perhaps a little yeast… And a little of this, and that…

The effort of cultivating these creatures, however laborious, has proven worthwhile to many serious aquarists (especially fish breeders). The reason for this is simple: Daphnia are extremely nutritious and fish love them. Still, for those who just don’t have the time to raise their own (or to wade into the nearest waterhole with a dip net every weekend), obtaining inexpensive, fresh, live daphnia has been frustratingly difficult.

AlgaeBarn has changed all of that with the commercial-scale production of Daphnia magna. For those who aren’t yet all that familiar with the water fleas, these are big ones. Actually, at a length of up to 5 mm, they’re about two or three times as large as the average daphniid. This makes them a bona fide community fish food. While not too big for some corals (mainly LPS), they are certainly large enough for a considerable variety of reef fishes to capture and consume. Their slow, conspicuous (sort of daft, to be honest) swimming movements make them a sure target for any zooplanktivorous reef fish in particular.

An exotic delicacy

Alright, so if you do know much about water fleas, you’re already aware that they’re not from coral reefs. Neither are brine shrimp, but brine shrimp nevertheless have kind of proven to be an awesome reef aquarium food, right? Same here. Like adult brine shrimp, Daphnia magna are relatively huge pods that exhibit a “tempting” swimming behavior and are easy for predators to catch. But unlike unenriched adult brine shrimp, Daphnia magna are absolutely loaded with nutrition.

This all makes them really, really useful for a couple of purposes. Firstly, they are very effective for prompting sick or unusually finicky fish (e.g. tilefish) to resume feeding. While easily noticed, and apparently very alluring, they are effortlessly captured even by slow, ill or shy fish. They are just as easily consumed, as they cannot put up much of a fight going down.

Secondly, they are highly useful as a supplemental live food item. Of course, the diet of the food organism affects its nutritional content. But daphniids are generally quite wholesome regardless of what food they’re raised on; at around 45-70% protein and 11-27% fats/oils, they’re not too shabby as far as pod nutritional content goes. And their larger size all but guarantees that most, if not all, of your reef fish get a few big bites. While we stress that these are definitely great as a “treat” for the typically diverse reef fish community, they’re downright amazing for enhancing the diet of more dedicated zooplanktivores like seahorses, pipefishes, anthias, Genicanthus angelfish, large mandarins, etc.

Portion control

The key to using this particular pod is feeding it out slowly. The reason for this is that it cannot survive for very long in full-strength seawater. Luckily, it is adapted to slightly brackish environments (up to 8 ppt) and can Daphnia Magnatolerate reef conditions for a short while. Adding just a few at a time ensures that each gets eaten while still hanging openly in the water column. This is especially important for strongly zooplanktivorous types of fish such as seahorses. One cool thing about these Daphnia magna is that they are raised in brackish conditions and are pre-adapted as much as possible to the salty waters of your reef system.

If you wish to feed them out very slowly, you can simply hold them in a gallon or two of dechlorinated tap water (unheated and lightly aerated) with a very small amount of salt (just a few parts per thousand). To maintain their health and nutritional value over longer periods of time, we recommend feeding them while they are in holding. Like other daphnia, they eat a wide variety of tiny things ranging from phytoplankton, bacterioplankton, detritus, protozoans, and so on. AlgaeBarn recommends feeding them with what they feed them: A base diet of OceanMagik (for protein, fatty acids, carotenoids) with a dash of PNS YelloSno (for yet more protein as well as vitamin B12).

While daphnia reproduction is a bit on the slow side (just a few individual young per clutch!), they persist for quite a while under basic culture conditions. They are not particularly demanding, but certainly live longer and at higher densities when conditions are relatively stable. Daphnia magna has an average lifespan of ~40 days at 25°C and ~56 days at 20°C. Give them frequent but small feedings of high quality food (preferably a B vitamin-rich diet based on live phytoplankton) and refresh their culture water often (30-50% changes every day or so). A source of bright illumination (12-14 hours/day) helps to keep live phyto (if used) alive. You’ll probably notice that they do consume their food very quickly. Despite this, do not be tempted to overfeed; foul water will ruin a culture in very short time.

Those with large, well-stocked reef systems won’t need to bother with holding. That’s for sure! In those cases, a whole portion of these daphnia can be added at once, as the fish won’t rest until every individual is consumed. You might even be surprised by the ferocity with which fish attack these big, juicy pods. Even if your fish are spoiled with regular additions of live brine shrimp, they’ll still go nuts when they see daphnia hit the water. We’re honestly not sure if it’s their beefiness, the way they swim or their nutritional content that consistently drive fish so wild–we’re just stoked that they work so well!

Reader Interactions

Comments

  1. Thereasa Gardner says

    July 20, 2020 at 1:18 pm

    I’d love to try all assortment of live foods. I’ve been growing copepods and amphipods in my tank, and theyve been doing great!

    Reply
  2. Shawn Vest says

    July 20, 2020 at 1:27 pm

    Love these are more nutritious than brine shrimp, would be fun to breed them as an on hand sw aquarium food!

    Reply
  3. Russell George says

    July 20, 2020 at 1:30 pm

    Sounds weird bringing fleas into your house but if the fish love them, it may be a good treat for them from time to time.

    Reply
  4. flip mode says

    July 20, 2020 at 1:33 pm

    Always thinking

    Reply
  5. Donna L Holder says

    July 20, 2020 at 1:38 pm

    thank you for this great info

    Reply
    • Richard M Jackson says

      July 20, 2020 at 1:50 pm

      Great read. Live food is critically important to the health of any ecosystem. I love the foods i get from the barn!

      Reply
      • Christalyn Maza says

        July 23, 2020 at 8:38 am

        I never thought about feeding my fish these before. Good to know I can!

        Reply
        • cronamator says

          July 29, 2020 at 4:16 pm

          Right? Me too!

          Reply
  6. Esther says

    July 20, 2020 at 1:43 pm

    Interesting!

    Reply
  7. Peter G says

    July 20, 2020 at 1:47 pm

    I always though daphnia were like the celery of fish food, but I was wrong.

    Reply
  8. jugheadmckinney says

    July 20, 2020 at 1:52 pm

    I’ve never grown love food fish, but after reading this article, I am willing to give it a try.

    Reply
  9. Joaquin Diaz says

    July 20, 2020 at 1:58 pm

    Do these breed in the fuge?

    Reply
  10. Joy Chadwick says

    July 20, 2020 at 2:07 pm

    We’ve always used brine shrimp and this is a first hearing of Daphnia. I guess you learn something new everyday!!!

    Reply
  11. Jonathan Smith says

    July 20, 2020 at 2:26 pm

    Live food is best in my opinion

    Reply
  12. Octavio V says

    July 20, 2020 at 2:32 pm

    I wish I knew about Daphnis earlier. They are awesome super foods

    Reply
  13. Jeremy says

    July 20, 2020 at 2:52 pm

    I might have to try these one day. I am always up for a new treat for my piece of the reef.

    Reply
  14. tyler.powell says

    July 20, 2020 at 3:20 pm

    Great read

    Reply
  15. tyler.powell says

    July 20, 2020 at 3:24 pm

    Good info

    Reply
  16. lavishtour says

    July 20, 2020 at 3:35 pm

    It’s a forever food. They breed in your tank!

    Reply
  17. nicole morrison says

    July 20, 2020 at 3:46 pm

    Great food have not had a problem ?

    Reply
  18. CHRISTIAN DOMINE says

    July 20, 2020 at 3:53 pm

    might have to try some daphnia

    Reply
  19. CHRISTIAN DOMINE says

    July 20, 2020 at 3:54 pm

    might have to try some daphnia sometime, great write up

    Reply
  20. CHRISTIAN DOMINE says

    July 20, 2020 at 3:55 pm

    the more i read the more i learn!!!

    Reply
  21. Kayla Lussier says

    July 20, 2020 at 4:17 pm

    Interesting read, but the thought of them make me itch LOL

    Reply
  22. Abdullah Bacus says

    July 20, 2020 at 4:28 pm

    interesting read

    Reply
  23. Brandon Bangaree says

    July 20, 2020 at 4:45 pm

    Awesome information

    Reply
  24. Mitchell Draehn says

    July 20, 2020 at 4:54 pm

    Very interesting

    Reply
  25. henry says

    July 20, 2020 at 5:17 pm

    going to have to try these

    Reply
  26. scotty8284 says

    July 20, 2020 at 6:36 pm

    A varied diet can’t help but make your fish, and maybe corals (?), healthier and more vibrant!

    Reply
  27. Steven Flores says

    July 20, 2020 at 6:38 pm

    I’m feeling itchy. I guess one negative is not being able to pour in and continue populating.

    Reply
  28. Ethan says

    July 20, 2020 at 7:18 pm

    I love adding this food source to my tank just to add some variety in diet. 10/10 for the sea flea

    Reply
  29. Tracy Schultz says

    July 20, 2020 at 8:06 pm

    Awesome

    Reply
  30. Tracy Schultz says

    July 20, 2020 at 8:06 pm

    Awesome

    Reply
  31. Frank Politi says

    July 20, 2020 at 8:18 pm

    I have not heard of these before. Good read, and educational

    Reply
  32. Jorge says

    July 20, 2020 at 8:40 pm

    Great article, thanks for the information.

    Reply
  33. Brandon Baumann says

    July 20, 2020 at 9:44 pm

    Seems like a lot of work to be able to support feeding at home over a long period of time.

    Reply
  34. D says

    July 21, 2020 at 4:16 am

    roll em out

    Reply
  35. Jaana K Gilbert says

    July 21, 2020 at 5:30 am

    Definitely will have to try them!

    Reply
  36. Roy Ailshie says

    July 21, 2020 at 6:46 am

    Once again very educational and interesting blog

    Reply
  37. Robert says

    July 21, 2020 at 7:43 am

    Great article. I never considered Daphnia as a supplement. I am seriously considering implementing such a culture in the future.

    Reply
  38. Allen J Fagard says

    July 21, 2020 at 10:04 am

    Lots of work but worth it

    Reply
  39. Compy Ginorio says

    July 21, 2020 at 10:34 am

    Very interesting.

    Reply
  40. Amanda Zlab says

    July 21, 2020 at 11:44 am

    Great read! Thank you Algae Barn!

    Reply
  41. Abdiel Nieves says

    July 21, 2020 at 12:24 pm

    Can’t wait to try this with my mandarin

    Reply
  42. Shaun says

    July 21, 2020 at 12:27 pm

    Totally worth the expense in my opinion

    Reply
  43. Macco says

    July 21, 2020 at 2:52 pm

    My fish would love them

    Reply
  44. B says

    July 21, 2020 at 4:49 pm

    Would this be good food for a Mandarin?

    Reply
  45. Christina Wahrmund says

    July 21, 2020 at 9:04 pm

    Great information. I may have to try!

    Reply
  46. shadlepreston says

    July 22, 2020 at 12:28 am

    Good info!

    Reply
  47. Bob & Brenda Gardner says

    July 22, 2020 at 5:36 am

    I have always been reluctant to feed anything to my aquarium that is not naturally found in the ocean. I will need to give this some thought, just maybe I will try it.

    Reply
  48. zadok jollie says

    July 22, 2020 at 8:36 am

    I love learning about new diet supplements to feed my reef and this was a great find

    Reply
  49. Ricardo c. says

    July 22, 2020 at 9:39 am

    Great info thank you.

    Reply
  50. John Solomon says

    July 22, 2020 at 10:24 am

    Enjoyed the topic and informative in helping me with a successful reef tank (Y)

    Reply
  51. justan jenkins says

    July 22, 2020 at 7:25 pm

    Hmm well i do have a freshwater aquarium… i wonder if mollies would eat them or let them live in peace to multiply for a future saltwater tank…

    Reply
  52. Scott D Carpenter says

    July 23, 2020 at 2:08 am

    I have used the daphnia in a jar but never live. I would love to try them.

    Reply
  53. Nathan says

    July 23, 2020 at 8:10 am

    I had not heard of daphnia before.

    Reply
  54. ryan2577p says

    July 24, 2020 at 1:15 am

    I need to learn how to grow these!!

    Reply
  55. Rebecca Riles says

    July 24, 2020 at 10:31 am

    Cool

    Reply
  56. david nathan hatfield says

    July 25, 2020 at 3:33 pm

    so awesome

    Reply
  57. Bill Gray says

    July 25, 2020 at 4:35 pm

    Thank you for posting this!

    Reply
  58. kaylaroe1990 says

    July 25, 2020 at 6:54 pm

    ??

    Reply
  59. kaylaroe1990 says

    July 25, 2020 at 6:55 pm

    What type of fish are these good for

    Reply
  60. kaylaroe1990 says

    July 25, 2020 at 6:57 pm

    What are these best for

    Reply
  61. trevorburns45 says

    July 26, 2020 at 11:06 am

    Awesome

    Reply
  62. Catherine Carreiro says

    July 26, 2020 at 12:15 pm

    Super interesting! I have seahorses and will try this as a treat!

    Reply
  63. crystalgpscott says

    July 26, 2020 at 12:59 pm

    so much information! Thank you!

    Reply
  64. Dale Louderback says

    July 26, 2020 at 5:06 pm

    I had no idea

    Reply
  65. Betsy Myers says

    July 26, 2020 at 5:21 pm

    How informative .. and useful!

    Reply
  66. eve.roberts2024 says

    July 26, 2020 at 11:57 pm

    I’ve used these in lab in college! Love learning more about them!

    Reply
  67. Juan Carlos Perez says

    July 27, 2020 at 11:29 am

    Not too shure if i should add these along with copepods.

    Reply
  68. smithma274 says

    July 27, 2020 at 2:25 pm

    One of my favourite things about this hobby is how much there is to learn. Very informative!

    Reply
  69. Grace Riley says

    July 27, 2020 at 2:33 pm

    Hmmm, interesting option. Something to consider down the road.

    Reply
  70. Grace Riley says

    July 27, 2020 at 2:33 pm

    Hmmm, interesting option. Something to consider down the road.

    Reply
  71. Jim says

    July 27, 2020 at 3:07 pm

    Always great info in your articles

    Reply
  72. James Winkelman says

    July 27, 2020 at 3:09 pm

    Another helpful article. Thanks for the info.

    Reply
  73. Jordn Gerardot says

    July 27, 2020 at 3:34 pm

    Thanks for the great read

    Reply
  74. Daniel Paris says

    July 27, 2020 at 11:02 pm

    Thanks for the info

    Reply
  75. Scott Even says

    July 28, 2020 at 6:26 am

    So alien like

    Reply
  76. Kimberly Sims says

    July 28, 2020 at 9:35 am

    Great idea for love food

    Reply
  77. gbrag64 says

    July 28, 2020 at 10:31 am

    A bit of a hassle but definitely worth it in the end.

    Reply
  78. Caleb A Bates says

    July 28, 2020 at 1:29 pm

    Very Informative!

    Reply
  79. Donald says

    July 28, 2020 at 3:42 pm

    Thank you for posting this!

    Reply
  80. Angel says

    July 28, 2020 at 8:17 pm

    Haven’t try it but I’m going to give it a try one day

    Reply
  81. Cynthia Taylor says

    July 28, 2020 at 9:19 pm

    I used mine to feed both my freshwater and saltwater set ups!
    Even my bettas loved them!

    Reply
  82. Michael Kessler says

    July 29, 2020 at 9:39 am

    Interesting read

    Reply
  83. ROBERT FERNETTE says

    July 29, 2020 at 12:46 pm

    I’ve got pods in my tank and they are a great addition. May have to give these guys a try next.

    Reply
  84. hotdolphin21 says

    July 29, 2020 at 6:47 pm

    Very interesting

    Reply
  85. Shannon Pickin says

    July 29, 2020 at 8:10 pm

    Interesting. Going to have to look more into this.

    Reply
  86. Debra Hayson says

    July 30, 2020 at 1:55 pm

    I have never heard of this brand of food for fish and I haven’t had a fish aquarium in years would like to try having fish again

    Reply
  87. Richard Hicks says

    July 30, 2020 at 2:37 pm

    I will have to give this a try. Have used it for my freshwater fish for years.

    Reply
  88. Vickie Gallo says

    July 30, 2020 at 2:45 pm

    Will have to giv this a try for sure!

    Reply
  89. Vickie Gallo says

    July 30, 2020 at 2:46 pm

    Will have to try this for sure!

    Reply
  90. Aubrey Scott Daniels says

    July 30, 2020 at 5:59 pm

    Great information. Thanks for sharing

    Reply
  91. Kaden Horn says

    July 30, 2020 at 11:17 pm

    Going to try this myself! Great alternative

    Reply
  92. Joey Gatlin says

    July 30, 2020 at 11:23 pm

    Very good info

    Reply
  93. Kelly Freeman says

    July 31, 2020 at 6:06 am

    thanks for the info!

    Reply
  94. Kale says

    July 31, 2020 at 7:49 am

    It’s brilliant that these are raised in brackish conditions. I’m wondering if all dahlia can be raised that way or just certain species.

    Reply
  95. Rudy A Garcia says

    July 31, 2020 at 2:58 pm

    Never would have considered using “water fleas” as food for my aquarium fish. Learn something new every day.

    Reply
  96. kirkbovie says

    July 31, 2020 at 4:07 pm

    Definitely know your tank is established when you start seeing these little critters everywhere.

    Reply
  97. kirkbovie says

    July 31, 2020 at 4:07 pm

    Definitely know your tank is established when you start seeing these little critters everywhere.

    Reply

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Recently, our friends over at Bulk Reef Supply filmed a product review on one of our bestsellers, EcoPods. If you haven’t watched the video yet, you can

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Ocean Pollinators

We have some very exciting news to share about ocean pollinators! Marine researchers in France have just released exciting news that could change the way

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