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You are here: Home / Advanced Education / Do Corals Really Eat Plankton?

Do Corals Really Eat Plankton?

by Kenneth Wingerter

It’s hard to say for sure which came first for reef aquarists–the emergence of high-quality coral foods, or the realization that corals actually, really, truly do eat them. Though aquarists are generally a skeptical bunch, the initial apprehension to feeding corals is pretty understandable; in all fairness, many such foods sold in the recent past have turned out to be nothing more than expensive phosphate bombs. Still, it is absolutely clear at this point that feeding a coral a nutritionally rich, complete, and well-balanced diet increases its growth rate and builds vigor overall.

Now, obviously, this is the case for corals that we must feed–the azooxanthellate corals. What’s most notable is that this is also the case for zooxanthellate corals. Sure, most of the “photosynthetic” coral species we commonly keep in our aquaria are indeed obligate symbionts. That is, they ultimately depend upon the survival of their symbiotic dinoflagellate partners for their own survival; while these corals can get by without feeding, they can’t get by without their zooxanthellae. BUT, that being said, it does appear that feeding these corals can markedly improve their health and growth.

The Natural Coral Menu

Great… So, in addition to the sustenance they harvest from their zooxanthellae, corals eat live stuff (plankton) that they catch from out of the water column. So, what is best for feeding corals in captivity?

If your answer is “the same live stuff they eat in nature” then you guessed right!

Alright… So what do they eat in nature? Here’s where we get forced into making some very, very broad generalizations. Corals vary somewhat in diet from species to species; even within a species, diet may vary between regions, seasons, etc. But according to findings by marine ecologists, the diet of tropical reef corals consists primarily of bacteria. Seriously. This has to do primarily with the relative abundance of dissolved organic carbon available in reef habitats. What’s really shocking is the high level of selectivity exhibited by corals (for rhizobial bacteria, for example) in their bactivory. These picoplankton are selected not just for food energy but also for their probiotic qualities and ability to fix nitrogen.

Compared to bacteria, corals consume a surprisingly small amount of phytoplankton. This is because the characteristically low concentrations of nitrate and phosphate there cannot support lush phyto growth. And, only paltry amounts of phyto drift in from the open ocean. It is important, however, to understand that phyto is nonetheless critical for the health of countless coral species; this is because these nanoplankton is a major source of fatty acids as well as essential vitamins such as vitamin C. In other words, a little bit of phyto goes an extraordinarily long way in completing the coral (especially soft coral) diet. Since corals are highly selective in terms of phyto size (and different phyto species vary in size a lot), multispecies blends are preferable when feeding mixed reef communities.

Lastly, some (mainly stony) corals capture and consume copepods. These microplankton can be quite abundant in the reef environment. Reef pods differ substantially from oceanic pods in their diets; as opposed to oceanic pods which mostly consume phytoplankton, reef pods mostly consume protozoa (which mostly consume bacteria). Still, as with corals, a little bit of phyto goes a long way in supporting pod health (especially during their larval stages). Probiotic bacteria and their digestive enzymes enhance the digestive health of their hosts as they are passed along the food chain from protists to pods to corals. 

Phyto for Pico, nano, and Micro Bites

Many aquarium hobbyists are stunned upon learning how significant the contribution of plankton is to the natural diets of corals. It is pretty easy to comprehend how a coral can filter-feed particulates such as marine snow or take up substances such amino acids directly from the water; but complex predator-prey interactions between corals and microscopic bacterioplankton/phytoplankton/zooplankton are pretty mind-bending. 

This is certainly the case with suspension feeding. In most of our imaginations, suspension feeding is as simple as a bacterium getting stuck in the coral polyp’s mucus and subsequently ‘absorbed” into the gut. To be sure, it’s a bit more complicated than that.

The epithelium (outer “skin” layer) of corals is covered with cilia. These cilia brush water over the surface of the polyp. This helps to draw in nutrients/oxygen and expel wastes/CO2. It can even help to remove silt and detritus. But it also is used to translocate mucus and, therefore, entrapped food. The cilia of some genera (Turbinaria, Pachyseris, Pavona, etc.) are capable of sweeping mucus into long, stringy structures. As theses tiny nets project into the water column, they very effectively capture bacterioplankton, phytoplankton and even smaller zooplankton. Ultimately, the cilia brush the mucus (and food particles) into the gut; this action is termed intracoelomic feeding.

A lesser-know feeding strategy, termed extracoelomic feeding, uses mesenterial filaments to capture and even digest the item outside of the body cavity. Though we generally think of these filamentous structures as weapons that corals use against each other, they are also important for feeding. Indeed, one study found that Galaxea fascicularis digests nearly all of its prey in this manner.

Finally, most of us are aware of how tentacles capture prey with nematocysts. When a roving pod bumps into a coral tentacle, the stinging cell is triggered and releases a harpoon-like barb into the prey; an attached thread restrains the victim and delivers a dose of immobilizing venom. This mode of hunting is favored by stony corals.

The use of mucus nets, mesenterial filaments and nematocysts may be used in combination by many corals. Some species rely mainly on their mucus by day and their stinging tentacles at night. Some only release mesenterial filaments when exposed to certain cues (e.g. the smell of certain food sources).

In any case, the importance of plankton (in addition to particulate and dissolved organic matter) in the diets of corals is now well-demonstrated. Even photosynthetic corals. These needs can be met with quality prepared diets such as BeneReef–and we indeed encourage their supplemental use. However, no coral foods compare to live coral foods. Consider for example some of the items in AlgaeBarn’s ever-popular Ultimate Ecopack; the rhizobial microbes in PNS ProBio, which are rich in protein and carotenoids, are known to be highly selected for by corals. The four different species of phyto in OceanMagik satisfy the particle size preference of any coral. These live bacterioplankton/phytoplankton commit a bonus act of kindness by removing excess nutrients (such as nitrate and phosphate) from the water until they are consumed. Likewise, before they are eaten, the four different copepod species in EcoPods remove detritus and nuisance algae.

For zooxanthellate corals, lighting that supports their symbiotic algae is paramount. But, in addition to that, an abundance of nutritionally balanced live plankton might maximize growth, vigor and coloration like you’ve never imagined possible!

Reader Interactions

Comments

  1. shawn22vest says

    April 26, 2021 at 12:17 pm

    Great info that i preach to reefer already

    Reply
    • alexdedora says

      April 26, 2021 at 8:08 pm

      Yes

      Reply
  2. Scott Chase says

    April 26, 2021 at 12:53 pm

    Interesting info

    Reply
  3. Kirby Hughes says

    April 26, 2021 at 1:13 pm

    Great information!

    Reply
    • merlinr26 says

      October 21, 2021 at 1:58 pm

      Good information

      Reply
  4. fidney78 says

    April 26, 2021 at 1:57 pm

    Great info!!

    Reply
  5. Justin Zollar says

    April 26, 2021 at 2:06 pm

    Thanks for sharing!

    Reply
  6. Douglas Jordan says

    April 26, 2021 at 3:23 pm

    My corals definitely seem to grow better with phyto but I would say most of all it helped beat dinos

    Reply
  7. Michael Ehret says

    April 26, 2021 at 3:35 pm

    They do! Great Info!

    Reply
  8. gwyncwnannwn says

    April 26, 2021 at 4:58 pm

    good info

    Reply
  9. Douglas Ward says

    April 26, 2021 at 5:08 pm

    Good info!

    Reply
  10. jaimegage says

    April 26, 2021 at 5:19 pm

    Enjoyed the article

    Reply
    • elizah3 says

      November 21, 2021 at 11:41 pm

      Great info!

      Reply
  11. jaimegage says

    April 26, 2021 at 5:19 pm

    Enjoyed the article

    Reply
  12. Andrew Segmiller says

    April 26, 2021 at 5:46 pm

    Interesting read!

    Reply
  13. dpscott1 says

    April 26, 2021 at 6:00 pm

    Great info

    Reply
  14. coleman.j85 says

    April 26, 2021 at 6:12 pm

    Wow! Just wow

    Reply
  15. coleman.j85 says

    April 26, 2021 at 6:12 pm

    Wow! Just wow

    Reply
  16. Amanda Rasberry says

    April 26, 2021 at 6:14 pm

    Always more to learn

    Reply
  17. krenzer.ce says

    April 26, 2021 at 6:35 pm

    Always more to learn!

    Reply
  18. 1945sandy says

    April 26, 2021 at 6:47 pm

    Good basic info for any reefer!

    Reply
  19. Tim Brown says

    April 26, 2021 at 7:36 pm

    I recently started feeding phyto, amino acids, and vitamin C. My sps have really benefited and have really started to show off their polyps!

    Reply
  20. straitmartin says

    April 26, 2021 at 8:04 pm

    Yes they do!

    Reply
  21. William Monroe Jr says

    April 26, 2021 at 8:54 pm

    cool

    Reply
  22. the_northern_lights says

    April 26, 2021 at 9:26 pm

    Always love learning more

    Reply
  23. Jennifer Kennedy says

    April 26, 2021 at 9:27 pm

    I did always wonder what they ate in the reefs because phyto in the oceans is relatively close to the surface (catching the sunlight).

    Reply
  24. thillock says

    April 26, 2021 at 10:08 pm

    Did not know this.

    Reply
  25. Kevin Truong says

    April 26, 2021 at 10:29 pm

    Thanks for the useful information!!!

    Reply
  26. Natalie Fernandez says

    April 26, 2021 at 10:32 pm

    Might just have to buy some more live phytoplankton among some other things!!

    Reply
  27. Tejas Nair says

    April 27, 2021 at 2:19 am

    I think they do! My gonis seem to love phyto foods

    Reply
  28. Erik Larsen says

    April 27, 2021 at 4:40 am

    Great info, have fed photo in the past. Definitely need to start up again

    Reply
  29. Nick Seunath says

    April 27, 2021 at 5:32 am

    Yes they do

    Reply
  30. Nick Seunath says

    April 27, 2021 at 5:32 am

    Yes they do

    Reply
  31. shrimppyshrimp says

    April 27, 2021 at 6:17 am

    Great article for a new aquarist like myself

    Reply
  32. Bryan says

    April 27, 2021 at 6:29 am

    Corals are amazing and technology can get us so far in terms of quality of water and maintaining stability. At the end of the day, they need to eat.
    This is a great product I have used many times!

    Reply
  33. Josh Stevens says

    April 27, 2021 at 6:41 am

    Very good read

    Reply
  34. M Morgan says

    April 27, 2021 at 8:31 am

    I feel like there is just so much that phyto can do that we have barely tipped the iceberg.

    Reply
  35. Soren says

    April 27, 2021 at 8:38 am

    THis is an interesting article. I personally always dose phytoplankton to feed my corals and copepod population.

    Reply
  36. MAC says

    April 27, 2021 at 10:23 am

    Good read

    Reply
  37. Christian Wiebe says

    April 27, 2021 at 10:23 am

    What useful information! And it’s all written in a way that’s easy to understand!

    Reply
  38. MAC says

    April 27, 2021 at 10:24 am

    Yes Good read

    Reply
  39. pastort.a.sherman says

    April 27, 2021 at 11:16 am

    Good to know

    Reply
  40. kmwagner91 says

    April 27, 2021 at 12:23 pm

    Nice!

    Reply
  41. Charles Folstrom says

    April 27, 2021 at 12:57 pm

    Have to buy some more live phytoplankton

    Reply
  42. law says

    April 27, 2021 at 1:20 pm

    great read!

    Reply
  43. Keith Mace says

    April 27, 2021 at 2:12 pm

    Great info. Thanks

    Reply
  44. Emily Anderson says

    April 27, 2021 at 2:19 pm

    Thanks for sharing!

    Reply
  45. jumpin.jack says

    April 27, 2021 at 3:36 pm

    So cool! Glad that I already dose phytoplankton. Now I know it helps my coral too

    Reply
  46. Anya Libman says

    April 27, 2021 at 3:39 pm

    Great information!

    Reply
  47. Courtney Redmond says

    April 27, 2021 at 3:42 pm

    Great info!

    Reply
  48. Courtney Redmond says

    April 27, 2021 at 3:42 pm

    Great info!

    Reply
  49. Courtney Redmond says

    April 27, 2021 at 3:42 pm

    Great info!

    Reply
  50. Travis Lund says

    April 27, 2021 at 3:55 pm

    Good Info

    Reply
  51. [email protected] says

    April 27, 2021 at 4:35 pm

    Thanks for the good info.

    Reply
  52. reefkeeper.chuck says

    April 27, 2021 at 6:09 pm

    There is more evidence that SPS eat phytoplankton based on a 2018 study. Millis seem to really benefit from isocrysis gal Ana.

    Reply
  53. joshuastephens777 says

    April 27, 2021 at 6:09 pm

    Wow that’s a great read, very interesting to learn!

    Reply
  54. jrosscollins87 says

    April 27, 2021 at 7:18 pm

    Yes they do

    Reply
  55. Michael A. Grammar says

    April 27, 2021 at 8:52 pm

    I love phyto

    Reply
  56. alio1220000 says

    April 28, 2021 at 1:14 am

    This is great information

    Reply
  57. Preston Potwin says

    April 28, 2021 at 2:27 am

    Good info

    Reply
  58. jblaine86 says

    April 28, 2021 at 4:26 am

    Great article

    Reply
  59. Jahn Garcia says

    April 28, 2021 at 6:03 am

    Interesting

    Reply
  60. mitch.turner31 says

    April 28, 2021 at 6:06 am

    For sure

    Reply
  61. tony says

    April 28, 2021 at 8:43 am

    Awesome information and very educational.

    Reply
  62. bradjwaddell says

    April 28, 2021 at 9:02 am

    My corals do better with phytoplankton

    Reply
  63. ANTHONY CANDELORA says

    April 28, 2021 at 9:37 am

    Phyto makes the world go round

    Reply
  64. co.reau says

    April 28, 2021 at 9:56 am

    I learned a lot of great info here!

    Reply
  65. Juan perez says

    April 28, 2021 at 10:30 am

    Great info.

    Reply
  66. j_wey says

    April 28, 2021 at 1:34 pm

    I have tried to feed Phyto everyday to my tank

    Reply
  67. Mark Keller says

    April 28, 2021 at 2:36 pm

    Can it be frozen?

    Reply
  68. Josh Kleensang says

    April 28, 2021 at 2:39 pm

    Keep up the good work

    Reply
  69. reefbeard says

    April 28, 2021 at 6:44 pm

    Yep they do!!

    Reply
  70. Kristin Kirk says

    April 28, 2021 at 7:28 pm

    Good read. Always wondering what we should be feeding our corals to balance out their diet

    Reply
  71. Kristin Kirk says

    April 28, 2021 at 7:31 pm

    Good to know. Already use Ocean Magik to help our tanks

    Reply
  72. Miller says

    April 28, 2021 at 8:29 pm

    Gotta have it!

    Reply
  73. obwhan says

    April 28, 2021 at 9:35 pm

    Always more to learn yes they do

    Reply
  74. deanstudnicka says

    April 29, 2021 at 7:07 am

    When managed properly Plankton can be a real benifit for corals.

    Reply
  75. hcookdesign1 says

    April 29, 2021 at 8:29 am

    Came here to learn and definitely loved this!

    Reply
  76. aliciajahoor says

    April 29, 2021 at 2:24 pm

    Very informative!!

    Reply
  77. KRISTA FROST says

    April 29, 2021 at 4:03 pm

    Can’t wait until my tank is established enough to start on corals

    Reply
  78. angela_dominka says

    April 29, 2021 at 6:36 pm

    Yes! Corals eat phytoplankton !!

    Reply
  79. Christopher Burges says

    April 30, 2021 at 5:53 am

    Very interesting. I love your blog posts

    Reply
  80. Christopher Burges says

    April 30, 2021 at 5:53 am

    Very interesting. I love your blog posts

    Reply
  81. Ellery Wong says

    April 30, 2021 at 7:30 pm

    They definitely eat something else why would they have mouths right?

    Reply
  82. mackey004 says

    May 1, 2021 at 4:32 am

    Been trying to culture phytoplankton. Can’t get it right

    Reply
  83. Bob says

    May 1, 2021 at 10:47 am

    Some coral, like Duncans, it is easy to see them capture and eat food. I never knew about the external digestion of food in some coral.

    Reply
  84. joshirwin2 says

    May 1, 2021 at 10:50 am

    Love algaebarn phyto!

    Reply
  85. Jason Romero says

    May 2, 2021 at 5:31 am

    Great read!!

    Reply
  86. Eric says

    May 2, 2021 at 10:08 am

    I feed phyto everyday to my tank. I think it’s required to maintain a balanced ecosystem.

    Reply

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