February 17, 2006
From: Binyamin Koretz
Concerning message #13325:
In your earliery message you referred to a report from the 1970's concerning an observed population explosion of Notarchus indicus in Eilat. It's happening again right now!
In 2005, following a big influx of algae, we saw a moderate number of individuals over the course of the spring (March, April, May), all of them at night, and only at one dive site with a lot of thick seagrass around the sporadic coral heads. Then none for about 8 months, although we dived this site at night every week or two. As recently as 4 weeks ago, we still saw none. Then the algae started to return, and 2 weeks ago we counted 4 in one dive. Last night we saw dozens, perhaps hundreds, in one dive.
The one in front of my hand [lower photo] had just tumbled in front of me as I was finning - in its peculiar swimming motion. Another one crawled blithely across the back of a tiny (7 mm) Sclerodoris tuberculata. And among the many pairs you could see the range of coloration from creamy white to bright amber.
Locality: Eilat, Satil Area, 22-24m, Israel, Red Sea (Gulf of Eilat), 11 February 2006 (night), sea grass and patch reef. Length: up to 3 cm. Photographer: Binyamin and Shulamit Koretz
firstname.lastname@example.orgKoretz, B., 2006 (Feb 17) Re: Notarchus indicus at Eilat. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/15835
Their swimming behaviour must make them the clowns amongst the Sea Hares. I look forward to further observations
Notarchus indicus at Eilat
From: Bill Rudman, March 15, 2005
Re: Notarchus from Hawaii
From: John Hoover, August 3, 2000
Strange Sea Hare from Hawaii
From: John Hoover, August 2, 2000
More photos of Notarchus swimming
From: Jochen Scholtyssek, July 6, 2000
Notarchus indicus swimming
From: Jochen Scholtyssek, June 28, 2000