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troporobo

do nudibranchs have a mating season?

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So after nearly 15 years of the same dive sites, never seeing mating nudis, this past weekend they were literally everywhere. We see eggs all the time, but until now no mating pairs. I've searched but did not find any info on when they mate. Is it moon phase, or tides, or just luck?

 

First up, mating nembrotha chamberlaini. I was cursing my decision to rig for wide angle (until we came across a very cooperative hawksbill turtle)

 

47278244161_aa77688fd0_b.jpg

 

Then a nudi that I don' know and cannot look up right now, and was not very cooperative:

 

46363688605_67f806f27c_b.jpg

 

What's the secret?

 

 

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what do the eggs look like?

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Hi,
had some years with lots of mating nudies, and others like this with none....
Was allways first two weeks of february in the philippines ;-))

Two weeks ago in Anda i have seen many egg nests....
Have pics from your number one creating one...

Regards,
Wolfgang

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I see quite a few mating in Sydney seems to be an explosion in numbers in spring, most of my shots of mating nudis have been spring-summer, but also have one from the depths of winter. Your second nudi is Phyllidia ocellata, I found a few around Lembeh strait.

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Chris - Thanks a lot for the ID!

 

marcw - I've only once captured a nudi "in the act" so I cannot link the eggs to the species, but here are a few examples:

 

47298567871_a4e16fbf48_b.jpg

 

32356973207_ebb47ec1a0_b.jpg

 

47298567451_8765cf16cf_b.jpg

 

47298567761_73b6a79dbc_b.jpg

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