Re: Mass spawning in Haminoea cymbalum

February 21, 2007
From: Levent Cavas

Concerning message #19447:

Dear Bill,

I really wonder the green alga species around Haminoea cymbalum groups in Philibert's photo. I have been observing Haminoea hydatis around izmir-Turkiye coastlines and they are very abundant around invasive Caulerpa racemosa var.cylindracea meadows. In my aquarium experiments, Haminoea hydatis tended to leave their egg mass especially on Caulerpa fronds although my aquarium contains other sea plants such as Halophila sp, Posidonia etc. is there anybody who has similar observation with me?
I think, caulerpenyne, secondary metabolite of Caulerpales, can be effective in this interaction.
Best wishes
Levent Cavas
Dokuz Eylul Uni.

Cavas, L., 2007 (Feb 21) Re: Mass spawning in Haminoea cymbalum. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Levent,
I suspect they prefer a hard suface to lay their eggs on. On sandy shores eggs are often deposited on old bivalve shells and rocks.  In the photo alongside the egg ribbon appears to be a flattened ribbon. I would have expected a species of Haminoea to have a more cylindrically shaped egg ribbon. It looks rather different from you earlier photo [#11977 ].

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Feb 21). Comment on Re: Mass spawning in Haminoea cymbalum by Levent Cavas. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Haminoea hydatis

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