Guppy Genetics

Revision of 2020 Guppy Genetics Article

I revised my 2020 article ‘Guppy Breeding: Genetic Pitfalls and Successes‘.  Revision containsapril-18_2018-1 same basic material, but I simplified article.  I spent more time discussing popular mutations that can perplex beginners.  And I down-sized a complicated discussion on the genetics of swordtail guppies.   It was not that relevant in successfully outcrossing my beautiful delta-tail females (Photo) with male swordtail guppies.   These outcrosses were wildly successful and I had no trouble breeding out the swordtail trait.

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.)

Brine Shrimp for Aquarium Fish

Harvested 3-day-old Shrimp

Hatching and Growing Brine Shrimp (Artemia) is–I believe–the ultimate brine shrimp article for aquarium hobbyists. Starts with hatching eggs in a soup bowl without aeration. Moves onto ‘hatching dishes’ that automatically separate nauplii from shells, making harvesting fresh nauplii incredibly easy. More new subjects include cold storage of harvested nauplii, feeding fish decapsulated eggs, why lower salinity works best, and growing shrimp out for 3 days. Author discusses the many factors (osmoregulation, iron nutrition, sensitivity to heavy metals, etc) that affect hatching success.

Small-Scale Guppy Breeding

How to breed nice guppies in just 8 planted tanks

I revised my 2018 article Small Scale Guppy Breeding on how I keep and breed fancy guppies in just eight planted tanks.  You won’t see anything about fish rooms, drilled tanks, automatic water changers, etc.  It explains how I overcame the modern guppy’s fragility and disease susceptibility.