Assorted Fancy Guppy - Poecilia reticulata - Female

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Guppies are a popular fish for aquariums because of their bright colors and the long flowing fins of the males. While wild guppies are usually plain silver, the fancy guppies bred for the aquarium trade can be a variety of colors and combinations. Pattern and coloration can vary slightly even within a specific variety of fancy guppies due to their selective breeding. Males have long fan-shaped tails and long dorsal fins. Females are less colorful, and lack the elaborate fins but can grow slightly larger.

Guppies are peaceful fish and can be kept in most community aquariums. Because of their long finnage, fish that have a tendency to nip at fins, such as barbs, would not be appropriate tankmates. Guppies do well in planted aquariums and need good water quality. They can be sensitive to changes in their environment in parameters like temperatures and pH. Guppies are omnivores and can be fed most tropical freshwater aquarium foods like flakes and very small pellets as well as frozen foods like brine shrimp, Cyclopeeze, Spirulina, mosquito larvae and similar items.

Guppies are live bearing fish, and will usually reproduce frequently in the home aquarium. The adult guppies and other fish may eat the young fry, so they should be placed in a breeder trap or a nursery tank until they are larger. Guppies can be sexed by the shape of the gonopodium, the specialized anal fin just in front of the tail. Males will have a pointed, tube-like gonopodium while the gonopodium on females is typically flared and fan-shaped.