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Are there environmental influences that determine the sex ratio of fry- such as salinity, hardness, pH, or temperature?

April 26, 2017determine Environmental influences pH ratio salinity temperature

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Are there environmental influences that determine the sex ratio of fry- such as salinity, hardness, pH, or temperature?

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I ask because since we have set up our guppy/platy tank a couple of months ago (my first, I’ve always been a goldfish person in the past), we have had three batches of baby guppies, a total of about a dozen saved, and only 1 has been male. Pat.