Chromodoris collingwoodi feeding & breeding

March 23, 2010
From: Leanne and David Atkinson

Concerning message #15530:

Dear Bill,
David found an aggregation of feeding Chromodoris collingwoodi. I found one laying eggs on an ascidian beside the sponge where the rest of the group were feeding. These photos actually show the nudibranch using its foot to shape the rosette of eggs and the eggs being extruded. 

Locality: Seahorse Gardens, Nelson Bay Beach, Port Stephens, 8metres, New South Wales, Australia, Pacific Ocean, 21 March 2010, Sandy bottom with scattered sponges, bryozoans, ascidians, soft corals, Sea Pens and gorgonias. Length: 40 mm. Photographer: Leanne and David Atkinson.

Hope they are of interest.
Leanne and David Atkinson

atk@hunterlink.net.au

Atkinson, L. & D., 2010 (Mar 23) Chromodoris collingwoodi feeding & breeding. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/23381

Dear Leanne and David,

Thanks for another valuable set of photos. The more I see of chromodorids the more I feel that breeding aggregations usually begin as feeding aggregations. This may not be the case with herbivores such as the Sea Hares but if someone began a detailed survey of chromodorid aggregations I wouldn't mind betting that food would be the common factor.

It is good to get another record of this blue Dictyodendrilla sp. which appears to be the usual, perhaps only, food choice of this species.

Best wishes,
Bill Rudman

Rudman, W.B., 2010 (Mar 23). Comment on Chromodoris collingwoodi feeding & breeding by Leanne and David Atkinson. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/23381

Factsheet

Chromodoris collingwoodi

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