Reunion Is - Swarming and spawning of Stylocheilus

November 5, 2005
From: Philibert Bidgrain

Dear Bill,
Reunion Island sea slugs.
Three days after the first sighting of the swarm behaviour of Styocheilus striatus [message #15142], I found along the shore in 30 to 80 cm of water, groups of about hundred specimens who were spawning small egg strings on dead coral or little rock scattered on the sandy substrate.

Locality: Trou d'eau Llagoon. Reunion Island, Indian Ocean. Depth: 80 cm. 29 october 2005. Photographer: Philibert Bidgrain

I put in my aquarium a little fragment of dead coral covered with Stylocheilus spawn. Four days later, the eggs have disappeared, and I observed floating on the surface, small veliger larvae. In the same lagoon we observed on October 20 a massive coral spawning. "It's the spawning month..."

Best Regards
Philibert Bidgrain
http://vieoceane.free.fr/runseaslug/indexslug.htm

pbidgrain@yahoo.fr

Bidgrain, P., 2005 (Nov 5) Reunion Is - Swarming and spawning of Stylocheilus. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15175

Dear Philibert,
Thanks for bringing spawning into the picture. It is also coral spawning time (Oct-Nov) on the Great Barrier Reef, which fits Nerida's recent message [#15162] of Stylocheilus swarming there, But before we jump to conclusions, coral spawning in the Caribbean is also Sept- Oct which doesn't fit with Stylocheilus swarming, and from what I gather, coral spawning in Hawaii is a long drawn out affair from April to September.

Best wishes,
Bill Rudman

Rudman, W.B., 2005 (Nov 5). Comment on Reunion Is - Swarming and spawning of Stylocheilus by Philibert Bidgrain. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15175

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