May 2, 2008
From: Can Tunali
Concerning message #21447:
Dear Bill ,
These are from my refugium . I get my live rock from the local suppliers . They bring the live rocks from Maleysia , Indonesia or Singapore .
I noticed them first on 14 February 2008 as the shape in the lower photo.
The largest and the oldest one still alive and around 15 cm [upper photo]. They are laying eggs on the glass every 4 days.
Tunali , C.C., 2008 (May 2) Melibe engeli - aquarium hitchhiker. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/21541
The big animal laying eggs in you aquarium is a species of Melibe, almost certainly Melibe engeli. These amazing nudibranchs feed on small crustacea (shimps, prawns, crabs etc) by catching them in their large oral which acts like a fishing net. Have a look at the species' Fact Sheet and attached messages for more information. Also have a look at the other species of Melibe and Tethys on the Forum for more background information. You could possibly keep them alive by adding a few brine shrimp to the water but I am not sure if they would be able to capture swimimg prey.
The small white nudibranch [photo alongside] which you thought was a juvenile is a quite different nudibranch. It is an aeolid and probably doesn't grow much bigger. It will feed on some type of cnidarian, perhaps a hydroid or soft coral, but without a lot more information I can't say much more.
Melibe engeli and its oral hood
From: Charles Raabe, October 27, 2008
Giant-mouthed shrimp-eating sea slug
From: Katie LeFevre, November 14, 2007
More on Melibe engeli
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Melibe sp? in my aquarium
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Re: Hitch-hiking Melibe engeli
From: Todd Gardner, February 1, 2004
Hitch-hiking Melibe engeli
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Melibe engeli - dextral egg spiral
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Melibe engeli from Japan
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Re: Melibe sp. from S.E. Sulawesi
From: Terry Gosliner, March 3, 2000
Melibe from SE Sulawesi
From: Lindsay Warren, February 29, 2000