Jorunna funebris in aquarium

February 9, 2005
From: Cerdo Tserda


Dear Bill,
I am not into nudibranchs, but enjoy invertebrates in my small aquarium in my office. Today it is snowing outside and I need something warm and colorful! A few weeks ago I happened to find your wonderful website and, you won't believe it, a few days later I saw a Jorunna funebris in the nearby pet shop. A few aquaria further down, another coincidence, blue sponges for sale! It was really tempting... In the meantime, the Jorunna has eaten 3/4 of the sponge, and has laid eggs. [Length: 12 cm].  I will get more of the sponge from that shop [Welke, Lunen, Germany]. It's expensive, but they regularly get a piece or two. I am taking the bad ones, which look too ugly to sell.

What is known about breeding? Will the little ones be eaten by shrimp, hermite crab or small fish? Do the little ones look like the adult but smaller? Will they eat the same? Any information welcome.

Cerdo Tserda

a.manz@ic.ac.uk

Tserda, C., 2005 (Feb 9) Jorunna funebris in aquarium. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12966

Dear Cerdo,
It's not often I hear a happy story about buying nudibranchs in aquarium shops. I don't think we know anything about the breeding cycle in this species but from the minute size of the eggs in the egg ribbon we can be fairly sure the larvae will be numerous, very small, and have a relatively long free-swimmimg period in the plankton [2 weeks to 2 months?] where they will have to feed on microscopic plants in the water. Keeping veliger larvae alive in aquarium conditions is very difficult. Two major problems is having the right algal phytoplankton in the water and preventing the larvae from becoming trapped in the surface layer of the water where they die.

So I don't hold our much hope for any hatching larvae, but they may be a nice food change for filter feeding animals in your aquarium
Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Feb 9). Comment on Jorunna funebris in aquarium by Cerdo Tserda. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/12966

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