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I have a couple cultures of isopods that are getting established. I am trying to be patient, but it is slow going. Anyway, my question is this- is any exposure to light necessary for pods? That is to say, can I put them in a drawer and off my desktop? I feel like putting them in the dark is borderline cruel, but I also know that they really seem to prefer the dark. So, can I throw them in a drawer without a guilty conscience?
 

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They can be kept in the dark but here is a study citing that a daylight photo period can be conducive to quicker reproduction.

Simply because an animal is nocturnal doesn't mean it cannot benefit from a photoperiod..or that is isn't important in it's overall life cycle.. this tends to be variable in isopods keeping them in the dark does not maximize growth and reproduction for some species..

see for example

Can. J. Zool. 58(2): 235-240 (1980)
 
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