 This is considered to dilute the gene pool and therefore is avoided by fish breeders who wish to maintain pure strains.Avid hobbyists maintain registry records to ensure their Endlers are purebred; undocumented fish sold in pet stores as Endler's livebearers are assumed to have some degree of guppy hybridization.In addition, as "P. reticulata" has been found in the same bodies of water as "P. wingei", natural hybridization may also occur in the wild.