Is this fish a Sea Slug Mimic?

May 2, 2000
From: Mark McGrouther

Hi Bill,

I am about to put up a page on the museum's fish website on the harlequin sweetlips. As a juvenile, this fish is brown with large white spots. It swims with an undulating motion. It is believed to be a nudi or flatworm mimic. Do you know what it could be mimicking? I would ideally like to link to one of your pages. I had a quick squiz but couldn't find anything resembling the fish in the Sea Slug Forum.

[Harlequin Sweetlips - juvenile Plectorhinchus chaetodonoides Lacepède, 1800. PHOTO: Grey McNeil]


Mark McGrouther
Collection Manager (Fishes)
Australian Museum

McGrouther , M., 2000 (May 2) Is this fish a Sea Slug Mimic?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Mark,
I can't think of any nudibranch it resembles. If anyone has an idea about which nudibranch, if any, this fish resembles can they let me know please?

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (May 2). Comment on Is this fish a Sea Slug Mimic? by Mark McGrouther . [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from



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