Onchidoris bilamellata spawning

July 18, 2003
From: Jim Anderson


Dear Bill,
Here is another record of Onchidoris bilamellata spawning. We encountered several patches of animals and spawn, as the attached image, while diving on 13 July 2003 from the shore at Dunbar on the east coast of Scotland. The animals were found at depths around 6-7 metres at two sites separated by approx 8oo metres and although not in the prolific numbers observed by me previously, this was another mass event I believe. Water temp was 12 deg C on a gloriously sunny day.

Kind regards
Jim A

jander4454@blueyonder.co.uk

Anderson, J., 2003 (Jul 18) Onchidoris bilamellata spawning. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10454

Thanks Jim,
From earlier reports on the Forum it looks like mass spawning occurs in the UK region from at least July to September, and from August to December in California. It certainly appears to be a spectacular sight - perhaps not quite up there with coral spawning - but close
Cheers,
Bill Rudman

Rudman, W.B., 2003 (Jul 18). Comment on Onchidoris bilamellata spawning by Jim Anderson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/10454

Factsheet

Onchidoris bilamellata

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