Marigold Swordtail
Scientific Name: Xiphophorus hellerii
Common Name: Marigold Swordtail
A perfect starter fish! Swordtails are peaceful community fish that reproduce with ease. They are livebearers, meaning the females release live fry rather than laying eggs. It is recommended to keep more females than males, as males can easily harass females with relentless attempts to reproduce, leading to stress in the females. Dominant males will begin developing swords and a modified anal fin, called a gonopodium, around 1-1.5″ in length. However, it is not uncommon for less dominant males to maintain the physical appearance of a female until much later in life (even as large as 4″).
| Specs | Details |
|---|---|
| Species | Xiphophorus hellerii |
| Reproduction Type | Livebearer |
| Male Development | Sword and gonopodium develop at 1-1.5″ |
| Gender Ratio | More females recommended than males |
FAQ
How do swordtails reproduce?
Swordtails are livebearers. Females give birth to live fry rather than laying eggs.
Do males become aggressive toward females?
Yes, males may harass females repeatedly during attempts to reproduce, which can cause stress. Keeping more females than males is recommended.
Can male swordtails look like females?
Yes, less dominant males may retain a female-like appearance for a long time, even reaching sizes up to 4 inches.
Carolyn Russell –
Easy to care for and very peaceful in a community tank. I kept two males and four females, and the females stayed calm. The fry appeared after a few months, which was exciting. Great for beginners.
Julia Stewart –
The marigold color is vibrant and the fish are active but not aggressive. I noticed one male developed a sword after a few months. I added more females to reduce stress. Overall a satisfying addition to my tank.
Lisa Ince –
Perfect for a new aquarist. The fish are hardy and reproduce naturally. I didn’t have to worry about egg-laying or cleaning. The fry are healthy and grow quickly.