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Underwater Video & Photography: Discuss Seal Island - St. Ives in the General Diving Forums forums: Hiya, just thought I'd share this with you... Taken on Saturday at Seal Island just off St. Ives... cheers Eee...

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Old 09-08-06, 09:11 AM
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Seal Island - St. Ives
Hiya, just thought I'd share this with you... Taken on Saturday at Seal Island just off St. Ives...




cheers

Eee
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Old 09-08-06, 09:41 AM
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Nice
Thats cool anybody know what it is ?
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Old 09-08-06, 10:05 AM
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They are about 10 Nudibranches, and they look like they are in the process of Egg laying... first time I've seen them do that...

Generally only see them in ones and twos..
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Old 09-08-06, 12:15 PM
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Yes, they're nudibranchs. More specifically, I believe they are Polycera quadrilineata. They are mating, not laying eggs. Nudibranchs are hermaphrodites, so anybody can have sex with anybody - they just exchange sperms. I've never seen as many as this having group sex before but I have a recently taken photo of three Limacia clavigera, which look very similar, mating.
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File Type: jpg Limacia clavigera.JPG (64.6 KB, 14 views)
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Old 09-08-06, 12:24 PM
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John - what do you count as the difference between egg-laying and mating then?

The two at the top are definitely discharging egg coils.
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Old 09-08-06, 01:04 PM
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Quote:
Originally Posted by Lou
John - what do you count as the difference between egg-laying and mating then?

The two at the top are definitely discharging egg coils.
First they mate, in pairs or groups, then, when the eggs are fertilised, they lay them. According to a Swedish article I read, the eggs are laid "shortly after" mating. Whether that means minutes, hours, days or several weeks after mating, I don't know. I've seen lots of nudibranchs lay eggs but only one slug at a time, never comunally.
I didn't see that the two at the top are discharging eggs but I'll have another look.
Edit: I agree, it does look as though the two at the top are laying eggs.
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Last edited by John Gulliver : 09-08-06 at 01:06 PM.
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