Re: Opisthobranch ova & capsules
November 16, 2006
From: Tony Fernando
![](/images/m18331a.jpg)
Concerning message #3132:
Hello,
I saw the post with regard to multiple developing larvae inside egg capsules. I've been trying to culture Bursatella leachii plei through settlement with no success since August, but I can say that that species does also have multiple developing larvae in each egg capsule (I've seen 5-6). Attached are two photos; the upper one from the day an egg mass was laid, and the lower one taken on the third day after the egg mass was laid. I also have video of the pre-veligers(?) bouncing off each other as they move around inside their capsule. Both photographs were taken by me with an Olympus Mic-D in transmitted light mode at 255x. B. leachii normally hatches after 6 days when kept at room temperature.
Tony Fernando
Student, Applied Marine Science Department
Carteret Community College
Morehead City, NC (USA)
anthonyfernando@yahoo.com
Fernando, A.V., 2006 (Nov 16) Re: Opisthobranch ova & capsules. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/18331![](/images/m18331d.jpg)
Dear Tony,
Thanks for the information in the eggs. As you have found it is difficult to get the conditions right for keeping planktonic larvaealive and healthy in artificial conditions. Not only do you need to find the right planktonic algae for them to feed on but you have to find some way of keeping the veliger larvae away from bacteria and protozoa which will kill them.
Amongst the sea hares there is quite a variation in the number of eggs which will be found in each capsule. Some such as Aplysia fasciata can have over 40 embryos per capsule, while others such as A. punctata, have relatively few (approx 4 per capsule).
Best wishes,
Bill Rudman
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