1.Body Shape:
- Male: Males tend to have a more elongated and streamlined body shape. Their bodies may be slender and less rounded.
- Female: Females typically have a rounder and fuller body shape. They appear more robust and have a noticeably larger belly, especially when carrying eggs.
2.Dorsal Fin:
- Male: Male fantail guppies have a larger and more elaborate dorsal fin. The dorsal fin may be elongated, pointed, or have a sail-like appearance.
- Female: Females have a smaller and shorter dorsal fin. It is often rounded or triangular in shape.
3.Anal Fin:
- Male: The anal fin of male fantail guppies is modified into a structure called the gonopodium. The gonopodium is a rod-shaped organ used to transfer sperm during reproduction.
- Female: Females have a normal fan-shaped anal fin.
4.Body Coloration and Patterns:
- Male: Male fantail guppies are generally more vibrant and colorful. They often display intricate color patterns, including spots, stripes, and metallic sheen.
- Female: Females are usually less colorful and may have a more subdued coloration. Their body patterns are often simpler.
5.Size:
- Male: Males are generally smaller in size compared to females. They may grow up to 2 inches (5 cm) in length.
- Female: Females are larger and can grow up to 2.5 inches (6 cm) or more in length.
6.Behavior:
- Male: Males are known to be more active and agile swimmers. They often chase females during mating rituals.
- Female: Females tend to be more passive and spend more time near the bottom of the tank.
It's important to note that these are general guidelines, and there can be variations within the species. However, observing these physical characteristics should give you a good indication of the sex of your fantail guppies.