Guppy Longevity

Older Female
Older Male

My latest article Guppy Longevity (39 pages and 97 scientific references) discusses the genetics of longevity and answers the question of why fancy guppies don’t live that long.   Article  delves into the many factors (inbreeding, outcrossing, heterosis, purging, outbreeding depression, evolution, and disease) that are associated with  longevity.  It puts much of the blame for guppy fragility onto the all too common practice of using only young adults as breeders.     I have tried to make the science understandable, educational, and interesting.   Photo shows a 15 month old male and female.   Still room for improvement, but this is progress.   (Two years ago, my guppies were dying of old age or “what-not” at 5-8 months.)

Guppy Genetics 101

Genetics of breeding fancy guppies for fitness, disease resistance, and beauty


Breeding Guppies: Genetic Pitfalls and Successes (10 page article) describes my experiences with crossing various guppy strains–Metalheads, Blue Grass, pet shop guppies, swordtail guppies, etc.  Avoid the genetic problems I encountered as a beginning breeder.  Follow the story, which includes basic genetic explanations, to a happy ending–the creation of novel and beautiful phenotypes.  (Article revised June 2021)