We are working with copepods production at the commercial scale, My question
Look up Nitex nylon screen material. Pick a mesh size big enough for the nauplii to pass yet small enough to retain the adults.
Dear Abdelnaser,
We collected shrimp naplius through Shining the light. Babes and naplius will come on to the light. Maybe is useful to you.
Dear Abdelnaser, I suppose that you are working with different species, so nylon mesh (selective diameter) is of limited use due to various size of objects. I can recommend to try the temperature and/or salt gradients. I'm not sure about majority of tropical species (please, look http://www.int-res.com/articles/meps/15/m015p047.pdf) but adult and copepodits of some european species like Acan. americanus are getting into diapause state in the bottom. But nauplii are more active.
As well should use the fact of enough different annual generations when hatching happened in limited time in mass.
other possibility is usually different feeding of adult and nauplii!
Try to contact as well for the more special consultation Nancy H Marcus and/or Margaret Murray (they arn't in RG)
Copepod diapause eggs: A potential source of nauplii for aquaculture. 2001 in Aquaculture 201(1):107-115
Andrey
I have used successive mesh sizes in the past to separate nauplii from copepodites and from copepods. Actually we used a commercial device to do that, routinely used in aquaculture experiments where wild food is a must. Do not remember the mesh sizes, but I'd guess that 53 microns, 100 microns, 150 microns and 200 microns would yield sufficient size gradient for you to select the apropriate configuration...
Hi,
Thanks for your answer, do you know what is commercial device name and sources.
Best Regards
I noticed most of them answered the question. Of course using plankton with different mesh sizes will be the best and cheap way to separate them. but, chosing mesh size depends on size of adult Copepods you use. I work on Oithona so where the adult reaches a maximum size of 80-90micro where 200micron is of no use. As others suggested l advice you to choose mesh size based on adult size
I can recommend on the following trick: all cyclopoid life stages are positive light attracted. Nevertheless copepodites and adults swimm faster than nauplii. Therefore if you attract them by light after a while the density of the nauplii will be reduced
Try doing it several times sequenncly to enhance adult densities
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