Nudibranch in reef tank

January 4, 1999
From: Eirik Mack Eilertsen

This might be a bit out of the ordinary, but I've tried posting my question through aquarium related channels with no luck.
While looking into my reef tank with a flashlight one night, I stumbled across a big (1"), white opistobranch that seemed to be busy laying eggs in chains consisting of sausage shaped egg containers. The animal itself seems almost transparent white with snow white branched, feathery gills arranged in two lateral lines.

Enclosed are some simple drawings of what the animal looked like, with an additional close up view of one of the animals two tentacles. They did seem rather special to me, and might help you to ID the animal. The gills are more branched/feathery than what thy look like in the picture and is the overall striking feature of the animal.

Anything you can tell me about these animals would be greately appreciated. Quite a few nudibranchs are known to do inflict damage to corals and polyps, and most aquarists (although none of them able to ID the animals) told me to get rid of them. Personally I like them, and if possible would very much like to keep them.

The animals must have been introduced with corals shipped from Indonesia. If anyone knows what it could be and how I can best care for it, I would be grateful.


Thanks in advance.

Eirik Mack Eilertsen

Norwegian College of Fisheries Science
University of Tromsoe,
Tromsoe,
Norway

eirike@stud.nfh.uit.no

Eilertsen. E.M., 1999 (Jan 4) Nudibranch in reef tank. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/434

Dear Eirik,
Your drawings show all the characteristic features of a family of nudibranchs called the Tritoniidae. The rhinophores (head tentacles) have a ring of papillae around a central core which is unique to them. I can't be 100% certain but I suspect your animal is Tritoniopsis elegans. Have a look at the photos I have posted at the top of this page. When large their gills becomes large and expansive and give the body a flattened lace-like appearance. However, up to about the size of your animal, they have a more erect shape as you have drawn.

Whether you have this species or not, they will not eat hard corals but do feed on soft-corals, and it seems that most species have a fairly specific diet. Tritoniopsis elegans usually feeds on Lobophyton but has been recorded on other soft-corals such as Spongodes. If you have soft-corals in your aquarium it may find one to its liking. I would think you would notice if it was causing damage as it will only eat a bit at a time. If you haven't soft-corals it won't eat your hard corals. If that is the case then unfortunately it will gradually die of starvation. My feeling would be to let it live out its last days in the relative sanctuary of your aquarium.

Best wishes,
Bill Rudman.
PS. Please let me know if I guessed right?

Rudman, W.B., 1999 (Jan 4). Comment on Nudibranch in reef tank by Eirik Mack Eilertsen. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/434

Related messages

  1. Tritoniopsilla elegans - egg laying
    From: Sven Kahlbrock, September 19, 2008
  2. A case of Caphira yoodokai eating Tritoniopsis elegans
    From: Seiko Kuroe & Akira Mada, July 7, 2007
  3. Tritoniopsis elegans in aquarium
    From: Andrea Urban, March 13, 2007
  4. Feeding Tritoniopsis elegans
    From: Vik Shah, August 17, 2006
  5. Can you help Identify this hitchhiker?
    From: Jimmy Carmichael, January 13, 2006
  6. Unidentified Nudibranch in aquarium
    From: David Seibel, December 24, 2004
  7. Tritoniopsis elegans from Red Sea
    From: Oren Lederman, August 11, 2004
  8. Tritonopsis elegans from Kenya
    From: Ann Clear, July 19, 2004
  9. Re: Tritoniopsis elegans in aquaria [2]
    From: Albert Jeffer, March 16, 2004
  10. Tritoniopsis elegans in aquaria
    From: Wade Waldman, March 12, 2004
  11. Tritoniopsis elegans in aquaria [2]
    From: Albert Jeffers, March 12, 2004
  12. Finally found in Queensland
    From: Gary Cobb, November 19, 2003
  13. Re: Tritoniopis elegans in aquarium
    From: Chris Peacock, July 18, 2003
  14. Tritoniopis elegans in aquarium
    From: Chris Peacock, July 5, 2003
  15. Tritoniopsis elegans in aquarium
    From: Ember Barnett, May 30, 2003
  16. Tritoniopsis elegans in home aquarium
    From: Brian Lindsay , February 28, 2003
  17. ID Sea Slug
    From: Joe, February 13, 2003
  18. Re: Tritoniopsis elegans in aquarium
    From: Marc Daniels, January 25, 2003
  19. Are these Tritoniopsis elegans eggs?
    From: Onel, January 25, 2003
  20. Tritoniopsis elegans in aquarium
    From: Marc Daniels, January 22, 2003
  21. Tritoniid in aquarium
    From: Mary Middlebrook, January 18, 2003
  22. Tritoniopsis elegans - causing aquarium problems
    From: Sam Young, November 11, 2002
  23. Unexpected Tritoniopsis elegans guests
    From: Mark Armstrong, May 31, 2002
  24. Tritoniopsilla alba ? from the Philippines
    From: Erwin Koehler, April 24, 2002
  25. Tritoniopsis elegans and camouflage
    From: Nishina Masayoshi, October 18, 2001
  26. White nudibranch from Dendronephthya
    From: Wyatt Patry , September 26, 2001
  27. Another aquarium mystery
    From: Christy Falkenberg, September 16, 2001
  28. Tritoniopsis elegans - eggs
    From: Bernard Picton , August 19, 2001
  29. Tritoniopsis elegans feeding
    From: Leslie Chan, August 18, 2001
  30. Tritoniopsis elegans from Hong Kong
    From: Bernard Picton , August 18, 2001
  31. Tritoniopsis elegans - hitchhiker
    From: Tom O'Toole, July 31, 2001
  32. Tritoniopsis elegans from Hong Kong
    From: Leslie Chan, July 8, 2001
  33. Tritoniopsis elegans in aquarium
    From: Donna Pinnock, May 11, 2001
  34. Tritoniopsis elegans in aquarium
    From: Tracey Bollier, February 9, 2001
  35. Tritoniopsis elegans from South Africa
    From: Valda Fraser, January 27, 2001
  36. Unknown Nudibranch
    From: Marc Elig, December 12, 2000
  37. Tritoniopsis - another hitchhiker
    From: Jim Roth, September 23, 2000
  38. Tritoniopsis elegans in aquarium
    From: Cindy Nichols, January 4, 2000
  39. Tritoniopsis from Thailand
    From: Erwin Koehler, July 9, 1999
  40. Sponge-feeding tritoniid?
    From: David & Leanne Atkinson, April 14, 1999
  41. Re: Nudibranch in reef tank
    From: Eirik Mack Eilertsen   , January 4, 1999

Show factsheet and all related messages