Male guppies mature in 7 weeks or less. Guppies have 23 pairs of chromosomes , including one pair of sex chromosomes , the same number as humans. Sometimes this has occurred accidentally, but most often as a means of mosquito control. Distribution map for Poecilia reticulata. Guppies are well developed and capable of independent existence without further parental care by the time they are born. Although not typically found there, guppies also have tolerance to brackish water and have colonized some brackish habitats. Shoaling guppies spend less time and energy on antipredatory behavior than solitary ones and spend more time on feeding. Archived from the original on 22 October
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