Guppy
Scientific name: Poecilia reticulata
Other names: Rainbow fish
Guppies are small freshwater fish native to northeastern South America and are popular in the aquarium hobby for their vibrant colors and easy care requirements.
IUCN Red List of Threatened Species : Least Concern
Guppies (Poecilia reticulata) are small, colorful freshwater fish native to northeastern South America. They are one of the most popular species in the aquarium hobby due to their vibrant colors, diverse patterns, and ease of care. Guppies are highly adaptable and can thrive in a variety of water conditions, making them ideal for both beginner and experienced aquarists.
Known for their lively behavior and active swimming, guppies are social fish that do well in community tanks with other peaceful species. They are livebearers, meaning they give birth to live, free-swimming fry rather than laying eggs. This characteristic, along with their prolific breeding habits, makes them fascinating to observe and study. With an average lifespan of 1–2 years, guppies offer both aesthetic appeal and an engaging fishkeeping experience.
Navite Location
NorthEast of South America / Caribbean islands
Varieties
Endler’s / Moscow / Japan Blue / Full Red / Half Black / Swallow / Glass
Suggested Tank Mates
Platies / Swordtails / Neon Tetras / Corydoras Catfish / Harlequin Rasboras / Shrimp and Snails / Mollies
Tank Mates to Avoid
Cichlids / Bettas / Tiger Barbs / Serpae Tetras / Angelfish
Diet
Flakes / Pellets / Common Live Foods / Frozen / Vegetable Matter
Breeding
gestation – 21 to 30 days / 5 to 100 fry per birth
Lifespan
1 to 2 years (sometimes up to 3 years)
Size
Males – 1.5 to 3.5 cm (0.6 to 1.4 in) / Females – 3 to 6 cm (1.2 to 2.4 in)
Minimum Tank Size
38 Liters (10 gallons)
Optimum Tank Temperature
22°C to 26°C (72°F to 78°F) / 25°C to 26°C (77°F to 79°F) for breeding
Ideal pH Level
7.0 to 7.8
Water Hardness
8 – 12 dGH / 10 – 15 dKH
Common Health Issues
Ich (White Spot) / Fin Rot / Velvet Disease / Columnaris / Dropsy / Swim Bladder Disorder / Fungal Infections / Parasites / Fish Tuberculosis
Interesting facts
Highly Adaptive
Guppies are remarkably adaptable and can thrive in a wide range of environmental conditions, including varying temperatures, pH levels, and water hardness. Originally native to northeastern South America and the Caribbean, they have been introduced to many parts of the world due to their adaptability and use in mosquito control.
Sexual Dimorphism
Male and female guppies exhibit significant differences in appearance. Males are smaller with vibrant colors and ornate tail fins, while females are larger with more subdued coloration. The bright colors and patterns in males are used to attract females and deter rivals.
Scientific Research
Guppies are widely used in scientific studies on evolution, ecology, and behavior due to their quick generation time and observable traits. Research on wild guppy populations has provided valuable insights into natural selection and adaptive evolution.
Livebearers with Developed Fry
Unlike many fish that lay eggs, guppies are livebearers, giving birth to fully formed, free-swimming fry. The fry are independent from birth and can feed and swim on their own.
Ability to Recognize Kin
Studies have shown that guppies can recognize their relatives and may show preferential behavior towards them. This recognition plays a role in social interactions and can influence mating choices and cooperative behaviors.
Beginner-Friendly
Due to their hardiness and ease of care, guppies are often recommended as a starter fish for those new to the aquarium hobby. Keeping guppies can teach beginners about basic fish care, breeding, and aquatic ecosystems.
References
Guppy FAQ’s
Are Guppies Nano Fish?
Yes, guppies are often considered nano fish, especially when compared to larger aquarium species. Here’s a breakdown of what makes guppies fit into the category of nano fish and some considerations for keeping them:
Nano Fish
Nano fish are typically small fish species that thrive in small aquariums or nano tanks, usually under 10 gallons (38 liters). They are often characterized by their small adult size, generally measuring 1 to 2 inches in length.
Characteristics of Guppies as Nano Fish
- Small Size – Adult guppies usually range from 0.6 to 2.4 inches (1.5 to 6 cm) in length, making them suitable for smaller tanks or nano setups.
- Compatibility – Guppies are generally peaceful and can coexist well with other small or similarly sized nano fish, making them a popular choice for community tanks.
- Active Swimming Behavior – Guppies are lively swimmers, which adds dynamic movement to a nano aquarium. They enjoy exploring their environment and will benefit from space to swim freely.
- Breeding Potential – Guppies are prolific breeders, which is an important consideration in a nano setup. If both males and females are kept together, they can quickly increase the population, leading to overcrowding.
Considerations for Keeping Guppies in Nano Tanks
- Minimum Tank Size – While guppies can be kept in smaller tanks, a minimum tank size of 10 gallons is recommended to provide adequate swimming space and maintain stable water conditions.
- Water Quality – Maintaining good water quality is essential in a smaller tank, as waste can accumulate quickly. Regular water changes and proper filtration are critical.
- Social Needs – Guppies are social fish that prefer to be in groups. Keeping at least 3 to 5 guppies together is advisable to promote natural social behaviors and reduce stress.
- Plant and Decor – Provide hiding places and plants in the tank to create a comfortable environment. This can help reduce stress and mimic their natural habitat.
- Tank Mates – Choose compatible tank mates that are also small and non-aggressive. Avoid larger or territorial species that may harass guppies.
Are Guppies Surface Swimmers?
No, while guppies can often be seen swimming near the surface, they are not exclusively surface swimmers. They are active fish that enjoy exploring all levels of their aquarium. To ensure their health and well-being, it’s essential to provide a suitable environment with enough space, hiding spots, and varied swimming areas. If you notice that your guppies are consistently staying at the surface or behaving unusually, it could indicate stress or water quality issues, which should be addressed promptly.
Are Plastic Plants Harmful to Guppies?
Plastic plants can be safely used in a guppy aquarium if you choose high-quality options with smooth edges. They provide decorative appeal without the maintenance requirements of live plants. However, to create the healthiest environment for your guppies, consider incorporating some live plants alongside plastic ones to offer biological benefits and a more natural habitat.
Can Bettafix be Used on Guppies?
While Bettafix can technically be used on guppies, it is not generally recommended.
Guppies are sensitive to medications. The tea tree oil concentration in Bettafix, though effective for some fish, can be stressful or harmful to guppies, potentially leading to skin irritation, fin damage, or even fatality if not dosed correctly.
Can Guppies Eat Brine Shrimp?
Guppies can safely eat brine shrimp, which provides numerous benefits for their health and vitality. Incorporating brine shrimp into their diet can enhance their growth, coloration, and overall well-being. Just be sure to maintain a balanced diet that includes a variety of food sources to meet their nutritional needs effectively.
Can Guppies Have Seizures?
While guppies do not experience seizures in the same way that humans or mammals do, they can display erratic swimming or behavior that might seem similar.
These sudden, uncontrolled movements are often signs of stress, poor water quality, sudden temperature changes, or illness. If your guppy shows these symptoms, it’s important to check water conditions, ensure a stable environment, and consult a veterinarian or aquatic specialist for further advice.
Can Guppies Tolerate Salt in Their Aquarium Water?
Guppies can tolerate low levels of salt in their aquarium water (brackish), which can be beneficial for disease prevention and overall health. However, it’s essential to use salt judiciously and monitor your fish closely for any signs of stress. If in doubt, consult with an aquarium expert or veterinarian for guidance on using salt in your specific setup.
Can I use Gravel for Guppies?
Yes, you can use gravel for guppies, but it’s important to choose the right type. Small, smooth gravel is best, as larger or sharp pieces can injure guppies or trap them.
Gravel provides a natural look, helps beneficial bacteria grow, and supports a healthy environment.
Always clean the gravel thoroughly before adding it to the tank and maintain it regularly to avoid debris buildup, which could affect water quality.
Can I use Rainwater for Guppies?
Using rainwater for guppies can be a natural and cost-effective option, provided you take necessary precautions to ensure its safety and suitability.
Always test and treat rainwater as needed, and maintain a stable environment to support the health and well-being of your guppies.
If you are unsure about the water quality, it may be safer to stick with dechlorinated tap water or use a water conditioning product designed for aquariums.
Do Guppies Eat Duckweed?
Yes, guppies do eat duckweed! Duckweed is a small floating plant that is often found in aquariums and natural water bodies. Here are some details regarding guppies and their interaction with duckweed:
Benefits of Duckweed for Guppies
- Natural Food Source: Duckweed is rich in nutrients, making it a good supplement to the guppy diet. Guppies can graze on it, which can help them meet their nutritional needs.
- High Protein Content: Duckweed contains a significant amount of protein, which is beneficial for guppies, especially during their growth stages or breeding periods.
- Aids in Digestion: The fibrous nature of duckweed can aid in digestion and contribute to the overall health of guppies.
- Environment Enrichment: Floating plants like duckweed provide cover and a natural environment for guppies, helping reduce stress and encouraging natural behaviors.
Considerations When Feeding Duckweed
- Balance Diet: While duckweed is nutritious, it should not be the sole food source. Guppies require a balanced diet that includes high-quality flakes, pellets, and other live or frozen foods.
- Avoid Overgrowth: Duckweed can grow rapidly and cover the surface of the tank, potentially blocking light and oxygen from reaching other plants and fish. Regularly remove excess duckweed to maintain a balanced aquarium environment.
- Introduce Gradually: If you are adding duckweed to an existing tank, do so gradually to allow your guppies to acclimate and start feeding on it.
- Monitor Water Quality: While duckweed can help absorb excess nutrients, it can also contribute to water quality issues if allowed to overgrow. Keep an eye on water parameters and remove excess duckweed as needed.
Do Guppies Float When They Die?
Yes, guppies often float when they die, but this isn’t always the case. When a guppy dies, gases produced by decomposition inside their body can cause them to become buoyant, making them float to the surface. However, some dead guppies may sink to the bottom of the tank initially and later float as gases accumulate.
Do Guppies Need to Be in Groups for Optimal Health?
Keeping guppies in groups is essential for their optimal health and happiness. A social environment promotes natural behaviors, reduces stress, and encourages breeding.
Ensure that your aquarium is adequately sized to accommodate the number of guppies you wish to keep, and provide hiding spots and plants to enhance their environment.
By providing a suitable group size, you’ll help ensure that your guppies thrive in their aquarium.
Do Guppies Prefer High or Low Water Flow?
Guppies prefer low to moderate water flow, reflecting their natural habitat. Providing a calm and stable environment will help reduce stress and encourage healthy behaviors, such as feeding and breeding. If you are setting up a tank for guppies, ensure that the water flow is gentle and conducive to their comfort and well-being.
How big should baby guppies be before release into the main tank?
Baby guppies, or fry, should typically be about 1 inch (2.5 cm) in size before being released into the main tank. At this size, they are usually large enough to avoid being eaten by adult guppies or other tank mates. This usually takes about 4 to 6 weeks, depending on water conditions, diet, and overall care. Before releasing them, ensure the tank has plenty of hiding spots, such as plants or decorations, to provide extra safety for the fry.
How Many Guppies for Different Tank Sizes
A common rule of thumb for stocking freshwater fish is one inch of fish per gallon of water. However, with guppies, it’s also important to consider their social nature and breeding habits.
Stocking Guidelines for Guppies
10 Gallon Tank – 5–7 guppies.
Ideal for a small group, but avoid keeping both sexes unless you’re prepared for fry.
15 Gallon Tank – 8–10 guppies.
A little more room allows for a larger group or a mix of males and females.
20 Gallon Tank – 10–15 guppies.
Suitable for a stable community with space for breeding.
25 Gallon Tank – 15–20 guppies.
Offers plenty of space for social interactions and breeding.
30 Gallon Tank – 20–25 guppies.
Ideal for a larger group; consider adding tank mates.
50 Gallon Tank – 30–40 guppies.
Ample space allows for a larger population and diverse tank mates without overcrowding.
What Age do Guppies Start Breeding?
Guppies can start breeding as early as 2 to 4 months of age, with males maturing slightly earlier than females. Providing optimal care, including proper water quality, nutrition, and a stress-free environment, will help encourage healthy growth and successful breeding. If you are breeding guppies, be prepared to manage the increasing fry population, as they can reproduce rapidly.
What is bioload, and how does it affect my guppies?
Bioload refers to the amount of waste produced by fish and other organisms in an aquarium.
In guppies, a high bioload can occur due to overpopulation, overfeeding, and inadequate tank size. This leads to poor water quality, increased ammonia and nitrite levels, and potential stress or health issues for the fish.
To manage bioload, monitor stocking levels, feed appropriately, perform regular water changes, and ensure proper filtration.
Why are all my baby guppies female?
There are a few reasons why you might be seeing only female baby guppies:
- Water Temperature – The temperature of the tank can influence the gender of guppy fry. Lower temperatures (around 72°F or 22°C) tend to produce more females, while higher temperatures (above 80°F or 27°C) favor males.
- Genetics – Some guppy strains are genetically predisposed to produce more females, depending on their lineage.
- Environmental Stress – Stressful conditions such as poor water quality, overcrowding, or fluctuating tank conditions can skew the gender ratio toward more females.
- Hormonal Factors – Hormones released by dominant males or females in the tank may affect the development of embryos, potentially leading to more females.
Making adjustments to the water temperature or tank conditions can help balance the gender ratio in future broods.
Why are my Guppies Kissing?
When guppies appear to be “kissing,” it is usually not a sign of affection but rather a form of interaction or competition.
This behavior can be a sign of dominance or territorial disputes, especially among males. They might also engage in this behavior while feeding or exploring their environment. If the “kissing” is aggressive or frequent, it could lead to stress or injury, so it’s important to monitor the situation and ensure the tank has enough space and hiding spots for all the fish.
Why are my Guppies not Breeding?
If your guppies are not breeding, there could be several reasons for this. Here are some common factors that can affect guppy breeding, along with potential solutions:
- Age and Sexual Maturity – Guppies typically reach sexual maturity at about 2 to 4 months of age. If your guppies are younger than this, they may not be ready to breed.
- Tank Conditions – Poor water quality can stress fish and inhibit breeding. High levels of ammonia, nitrites, or nitrates can be detrimental.
- Temperature – Guppies thrive in water temperatures between 22°C and 26°C (72°F to 79°F). Extreme temperatures can affect their breeding behavior.
- Stress Factors – Aggressive or territorial fish can stress guppies, making them less likely to breed. Overcrowded tanks can lead to stress and a lack of suitable breeding space.
- Diet and Nutrition – A poor diet can affect the health and reproductive readiness of guppies.
- Breeding Environment – Guppies prefer to breed in environments where they feel secure. Lack of plants or hiding spots can discourage breeding.
- Mating Behavior – Males will often display courtship behaviors to attract females. If females are not receptive or if males are too aggressive, breeding may not occur.
- Health Issues – If guppies are unwell or stressed due to disease, they may not breed.
- Environmental Changes – If you’ve made recent changes to the tank (e.g., new tank mates, water changes, or decoration rearrangements), guppies may take time to acclimate before breeding.
Why are my Guppies Swimming Vertically?
If your guppies are swimming vertically, this behavior can indicate several potential issues or stressors. Here are some common reasons why guppies might exhibit this unusual swimming behavior.
- Swim Bladder Issues – Affected guppies may float to the top, sink to the bottom, or swim vertically or sideways. Try fasting the affected fish for 24–48 hours to help clear any potential constipation. After fasting, feed them peeled, cooked peas to aid digestion. If the problem persists, it may be worth consulting an aquarium expert.
- Stress – Along with vertical swimming, stressed fish may exhibit hiding, clamped fins, or erratic movements. Monitor water parameters (ammonia, nitrite, nitrate, pH, and temperature) and ensure they are within the optimal range. Check for aggressive tank mates and consider rearranging decorations to reduce stress. Providing ample hiding spots can help fish feel more secure.
- Oxygen Levels – Fish may be gasping at the surface or spending more time in high-flow areas where oxygen is more abundant. Increase aeration in the tank by adding an air stone or adjusting the filter to improve water movement. Regular water changes can also help maintain oxygen levels.
- Other Illness or Disease – Look for additional signs of illness, such as discoloration, lesions, or changes in appetite. If you observe other symptoms of illness, consider isolating the affected fish and treating them with appropriate medications. Keeping water quality high and reducing stress can also support recovery.
- Natural Behaviour – Occasionally, guppies may swim vertically as part of their natural behavior, especially during mating displays or chasing one another. This is usually temporary and not accompanied by other signs of distress.
- Temperature Fluctuations – Fish may swim erratically or become lethargic. Maintain a stable water temperature between 22°C and 26°C (72°F to 79°F). Use a heater with a thermostat to keep the temperature consistent.
If your guppies are swimming vertically, it’s essential to investigate the underlying cause and take appropriate action. Monitoring water quality, ensuring proper tank conditions, and addressing any health issues will help maintain a healthy environment for your fish. If the behavior persists or worsens, consider consulting an aquarium expert or veterinarian for further guidance.
Why Are My Guppies’ Tails Pointed?
If your guppies’ tails appear pointed or have a sharp, angular shape, this could be a sign of several factors, ranging from normal behavior to potential health issues.
- Tail Damage or Injury – If a guppy has a torn or damaged tail, it may appear pointed as the fins fray or break. This can happen due to aggressive tank mates, rough decorations, or fighting. Look for other signs of injury, such as ragged edges, discoloration, or other physical abnormalities.
- Fin Rot – Fin rot is a bacterial infection that can cause the tails and fins to deteriorate. As the tissue breaks down, the tail may appear pointed or frayed. Look for discoloration, ragged edges, and potential swelling at the base of the fin.
- Genetic Traits – Some guppies have naturally pointed or lyretail fin shapes as a result of selective breeding. This is common in specific strains of guppies that have been bred for particular fin shapes. If the pointed tail is consistent with the overall appearance of the guppy and does not show signs of distress or injury, it may simply be a genetic trait.
- Water Quality Issues – Poor water quality can stress fish and lead to abnormal behaviors, including changes in fin shape. Elevated levels of ammonia or nitrite can weaken their immune systems, leading to injuries or infections. Monitor water parameters regularly and look for signs of stress in your fish, such as hiding, lethargy, or rapid gill movement.
- Stress – Stress can lead to various physical manifestations in fish, including changes in tail shape. Stress can be caused by overcrowding, aggressive tank mates, or sudden changes in water conditions. Look for other signs of stress, such as hiding, erratic swimming, or clamped fins.
Why Is My Guppies’ Poop Black?
Black poop in guppies can be caused by dietary changes, internal parasites, digestive issues, poor water quality, or other health problems. Monitoring your guppies closely and assessing their diet and environment is crucial for identifying the cause. If the issue persists or if you observe additional symptoms, consider seeking advice from a professional to ensure the health and well-being of your guppies.
Why Is My Guppy’s Tail Ripped?
A guppy’s tail may become ripped or damaged for several reasons, ranging from physical injuries to health issues. Here are some common causes and what you can do to address the problem:
Aggressive Tank Mates
Guppies are generally peaceful, but if kept with more aggressive or territorial fish, they may be nipped or attacked, leading to torn fins or tails.
Monitor tank dynamics and consider separating aggressive fish from guppies. Choose compatible tank mates that are known to be peaceful.
Fin Rot
This bacterial infection can cause the tail and fins to appear frayed, discolored, or deteriorated. It often begins as a minor injury that becomes infected due to poor water quality.
Improve water quality with regular water changes and proper filtration. Use antibacterial treatments to address fin rot, and isolate severely affected fish.
Physical Injury
Guppies may injure their tails by getting caught on sharp decorations, substrate, or equipment in the tank. Sudden movements can also lead to injuries.
Inspect the aquarium for sharp or rough objects and remove or replace them with smoother alternatives. Ensure that decorations are safe and appropriate for your fish.
Poor Water Quality
High levels of ammonia, nitrites, or nitrates, as well as inappropriate pH and hardness, can weaken fish health, making them more susceptible to injuries and infections.
Regularly test water parameters and perform water changes to maintain optimal conditions. Keep the tank clean and ensure proper filtration.
Stress
Stress can lead to weakened immune systems and increased susceptibility to injuries. Factors contributing to stress include overcrowding, rapid temperature fluctuations, or inadequate hiding spaces.
Provide adequate space, reduce stressors, and ensure that guppies have plenty of hiding spots and plants to feel secure.
Natural Behavior
Sometimes, tails may appear damaged due to natural behavior during mating displays or interactions with other fish.
Observe interactions closely and ensure that the environment supports natural behaviors without excessive aggression.
Disease
Certain diseases, such as columnaris or velvet disease, can cause fin and tail deterioration as part of their symptoms.
Monitor your fish for other symptoms of illness, such as lethargy or changes in appetite. If disease is suspected, treat accordingly with appropriate medications.
Preventive Measures
- Ensure that the aquarium is properly set up with smooth decorations and adequate hiding spots.
- Keep up with regular water changes and maintenance to ensure a healthy environment.
- Keep an eye on the interactions among tank mates to identify and address any aggressive behavior early.