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do nudibranchs have a mating season?

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#1 troporobo


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Posted 04 March 2019 - 05:11 AM

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)




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




What's the secret?



#2 marcw


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Posted 04 March 2019 - 12:14 PM

what do the eggs look like?

#3 trimix125


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Posted 04 March 2019 - 01:45 PM

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...


#4 ChrisRoss


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Posted 05 March 2019 - 03:42 PM

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.

#5 troporobo


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Posted 06 March 2019 - 05:01 AM

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: