Mass spawning in Haminoea cymbalum

February 16, 2007
From: Philibert Bidgrain

Dear Bill, 
In the last few days we observed in the lagoon of Saint Gilles, just near the beach, a phenomenon of mass spawning in Haminoea cymbalum. I found a lot of specimens (between 30 to more than 100 per m2) in several large patches near the beach. Usually we don't observe this species in this area.

Locality: Saint Pierre, 50 cm, Reunion Island, Indian Ocean, 7 February 2007, lagoon. Photographer: Alain Barrére.

I'm very interesting to know if anybody had observed the same comportment in another country. The spawn of this species looks like other Cephalaspidea species

Best regards
Philibert Bidgrain

Bidgrain, P., 2007 (Feb 16) Mass spawning in Haminoea cymbalum. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from
Dear Philibert,
It is quite a coincidence that I am posting today a message [#19464] from Scott Cummins about mating aggregations of sea hares. If conditions are good, many cephalaspideans, like the anaspideans, can quickly dvelop large local populations. Paul Furneaux's message [#11626] about H. zealandiae in New Zealand shows such an occurrence, but my experience in New Zealand is that while at times great mass mating events occurred, most years their behaviour was much more restrained.
Best wishes,
Bill Rudman Rudman, W.B., 2007 (Feb 16). Comment on Mass spawning in Haminoea cymbalum by Philibert Bidgrain. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Haminoea cymbalum

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