Onchidoris bilamellata - swarming in Scotland again.

October 23, 2002
From: Jim Anderson

Dear Bill,
We observed a swarm of these little animals at 24 metres on a reef in Loch Nevis on the west coast of Scotland. Sorry but I have no photos but there were several hundred of them with spawn. Sea temp was 14 deg C. This is only a few miles from the site we saw a similar event in August 2001 - see http://www.a4454.freeserve.co.uk/onchidoris-bilamellata-06.html for details of that event and http://www.a4454.freeserve.co.uk/onchidoris-bilamellata-03.html for details of a previous event in 2000.
Regards,
Jim A

jander4454@aol.com

Anderson, J., 2002 (Oct 23) Onchidoris bilamellata - swarming in Scotland again.. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8252

Thanks Jim,
From your records and the others already on the Forum from California and Ireland, these breeding swarms seem to be a normal occurrence for this species. It would be interesting to know if these breeding swarms are the result of them all migrating to 'breeding grounds' or whether its the result of all the animals in one area just reaching maturity at about the same time.
Best wishes,
Bill Rudman

Factsheet

Onchidoris bilamellata

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