Opaline Gourami Care Guide

Opaline Gourami


The Opaline Gourami, scientifically known as Trichopodus trichopterus, is a popular freshwater fish species in the aquarium hobby. Native to Southeast Asia, specifically Thailand, Malaysia, and Indonesia, this fish belongs to the family Osphronemidae.

Opaline Gouramis are widely appreciated for their unique characteristics and features. They possess a stunning opalescent coloration that displays shades of blue, green, and pink. Their elongated bodies are complemented by a distinctive dorsal fin, which is more pronounced in males. One of their most fascinating attributes is their ability to breathe air from the surface using a specialized labyrinth organ. This adaptation enables them to survive in oxygen-deprived environments and adds to their charm and adaptability.

Summary Table

Common NameOpaline Gourami
Scientific NameTrichopodus trichopterus
Origin / DistributionSoutheast Asia (Thailand, Malaysia, Indonesia)
Size4 to 5 inches (10 to 13 cm)
Aquarium SizeMinimum 20 gallons
Water ParametersTemperature: 75°F to 82°F (24°C to 28°C) pH: 6.0 to 7.5 Hardness: 5 to 15 dGH
Feeding FrequencyTwice daily
TemperamentGenerally peaceful, males can be territorial
TankmatesPeaceful community fish, avoid aggression/fin-nippers
BreedingBubble nest builders, provide floating plants, soft slightly acidic water
Lifespan4 to 6 years (approx.)
Care LevelBeginner to intermediate
Unique Features / AppearanceOpalescent coloration, longer dorsal fins in males
Conservation StatusNot evaluated by the IUCN Red List
Additional NotesCan breathe air from the surface, suitable for community aquariums


  • Common Name: Opaline Gourami
  • Scientific Name: Trichopodus trichopterus
  • Family: Osphronemidae
  • Order: Perciformes

The Opaline Gourami, scientifically known as Trichopodus trichopterus, belongs to the family Osphronemidae within the order Perciformes.

Natural Habitat & Distribution

Opaline Gouramis have a wide geographical range, primarily found in Southeast Asia. They are native to countries such as Thailand, Malaysia, and Indonesia.

In the wild, Opaline Gouramis inhabit various types of environments. They are commonly found in slow-moving or stagnant freshwater bodies such as rivers, streams, swamps, and flooded forests. These fish have adapted to both still and flowing waters, including flooded fields and marshes. Opaline Gouramis often prefer areas with dense vegetation, as it provides them with cover and hiding places.

Physical Appearance


Opaline Gouramis reach an average adult size of around 4 to 5 inches (10 to 13 cm) in length.

Coloration and Patterns

These gouramis exhibit a striking opalescent coloration, which includes shades of blue, green, and pink. The body coloration may vary between individuals, with some displaying more vibrant hues than others. They often feature iridescent scales that shimmer in different lighting conditions. The fins are typically translucent or slightly colored, complementing the overall appearance of the fish.

Body Shape and Fin Structures

Opaline Gouramis have an elongated and laterally compressed body shape, typical of gourami species. Their bodies are streamlined, allowing them to navigate through various aquatic environments with ease. These fish have a single dorsal fin that extends along the back, and their ventral and anal fins are located towards the posterior end of the body.

Sexual Dimorphism

There are noticeable differences between males and females of the Opaline Gourami species. Males tend to be larger and more vibrant in color compared to females. They have longer dorsal fins and pointed anal fins, while females have shorter and rounder fins. Additionally, males may develop a more extended and pointed caudal fin (tail fin) as they mature.

Behavior & Temperament

General Behavior

Opaline Gouramis are generally peaceful fish known for their calm and tranquil demeanor. They typically exhibit a peaceful nature, making them suitable for community aquariums. However, it’s important to note that males can become territorial, especially during breeding or when kept with similar-looking fish. In such cases, aggression may be displayed towards other males or intruders in their territory.

Social Interactions with Other Fish

Opaline Gouramis are known to be social fish and can coexist peacefully with a variety of tankmates. They are not typically aggressive towards other species, but individual temperament may vary. It is best to avoid keeping them with fin-nipping or aggressive fish that may harass or stress them.

Suitable Tankmates

Opaline Gouramis can be successfully kept with other peaceful community fish. Some suitable tankmates include tetras, rasboras, guppies, peaceful bottom-dwelling species like Corydoras catfish, and other similarly sized peaceful fish. It is advisable to select tankmates that occupy different areas of the aquarium, such as mid-level or bottom-dwelling fish, to provide a harmonious and balanced community.

Aquarium Requirements

Minimum Tank Size

Opaline Gouramis require a minimum tank size of 20 gallons to provide ample swimming space and accommodate their peaceful nature.

Water Parameters

  • Temperature: The ideal water temperature for Opaline Gouramis ranges from 75°F to 82°F (24°C to 28°C).
  • pH Level: Maintain a pH level between 6.0 and 7.5, which is slightly acidic to neutral.
  • Hardness: The recommended water hardness for Opaline Gouramis is around 5 to 15 dGH.

Filtration and Aeration Needs

Efficient filtration is crucial for maintaining good water quality in the aquarium. A reliable filter will help remove debris, maintain proper water parameters, and ensure a healthy environment for the fish. Opaline Gouramis appreciate gentle water movement, so consider using a filter with adjustable flow rates to prevent excessive water currents. Adequate aeration should also be provided, either through the filter or an air pump, to ensure oxygenation of the water.

Substrate Preferences

Opaline Gouramis are not particularly demanding when it comes to substrate. A fine-grained substrate, such as sand or smooth gravel, is suitable for them. Providing a dark-colored substrate can enhance the vibrancy of their coloration and make them feel more secure.

Lighting Requirements

Moderate to subdued lighting is preferred for Opaline Gouramis. They do not have any specific lighting requirements but will appreciate areas of shade or dimly lit spaces created by floating plants or other aquarium decorations.

Decorations and Hiding Places

Opaline Gouramis appreciate a well-decorated aquarium with plenty of hiding places. Live or artificial plants, driftwood, and rocks can be used to create a natural-looking environment. Floating plants like Amazon frogbit or Indian almond leaves on the water’s surface provide shade and create hiding spots. These decorations offer shelter and security for the fish, reducing stress and promoting their natural behavior.

Diet & Feeding

Type of Diet

Opaline Gouramis are omnivorous, meaning they consume a combination of plant matter and small organisms. In the wild, their diet consists of insects, small crustaceans, zooplankton, and various types of plant material.

Feeding Frequency

Opaline Gouramis should be fed twice daily. Offer an amount of food that they can consume within a few minutes. Overfeeding should be avoided to maintain good water quality and prevent health issues.

Tips for Providing a Balanced and Varied Diet

To ensure a balanced and healthy diet for your Opaline Gouramis, consider the following tips:

  1. High-quality Pellets or Flakes: Use a staple diet of high-quality pellets or flakes specifically formulated for tropical fish. These provide essential nutrients and vitamins.
  2. Live and Frozen Foods: Supplement their diet with live or frozen foods such as brine shrimp, bloodworms, daphnia, or small insects. These offer natural nutrition and help mimic their diet in the wild.
  3. Vegetable Matter: Include vegetable matter in their diet by offering blanched vegetables such as spinach, lettuce, or zucchini. You can also provide small pieces of algae wafers or spirulina-based pellets.
  4. Variety: Offer a variety of foods to provide a well-rounded diet. This helps ensure they receive all the necessary nutrients. Rotate between different types of pellets, flakes, live, frozen, and vegetable-based foods.
  5. Avoid Overfeeding: Be mindful of the amount of food provided and avoid overfeeding. Overfeeding can lead to poor water quality, obesity, and other health problems.

Remember to observe your Opaline Gouramis during feeding to ensure they are actively consuming the food. Adjust the amount and types of food based on their appetite and overall condition.

Tank Mates

Compatible Species

Opaline Gouramis can coexist peacefully with a variety of peaceful community fish. Some compatible species to consider for a harmonious community tank include:

  • Tetras (such as Neon Tetras, Cardinal Tetras, or Ember Tetras)
  • Rasboras (such as Harlequin Rasboras or Chili Rasboras)
  • Guppies (or other livebearers like Endler’s Guppies or Swordtails)
  • Dwarf Gouramis (other peaceful Gourami species)
  • Peaceful bottom-dwellers like Corydoras catfish or Kuhli Loaches
  • Small to medium-sized peaceful barbs (such as Cherry Barbs or Odessa Barbs)

These species share similar temperament and water parameter requirements, making them suitable tank mates for Opaline Gouramis.

Incompatible or Potentially Problematic Species

While Opaline Gouramis generally get along well with peaceful community fish, there are some species that may not be compatible due to aggressive behavior, fin-nipping tendencies, or differences in environmental preferences. It is advisable to avoid keeping Opaline Gouramis with:

  • Aggressive Cichlids or larger predatory fish
  • Fin-nipping species like Tiger Barbs or Serpae Tetras
  • Very small, delicate fish that may be intimidated by the Gouramis’ size

Recommendations for Creating a Harmonious Community Tank

To create a harmonious community tank with Opaline Gouramis, consider the following recommendations:

  1. Group Size: Keep Opaline Gouramis in small groups of at least 3 to 5 individuals. This helps reduce aggression and allows them to establish a natural hierarchy.
  2. Space and Hiding Places: Provide ample space and hiding places in the tank with the use of live or artificial plants, driftwood, or rock formations. These spaces offer shelter and territories for each fish, reducing stress and territorial conflicts.
  3. Tank Size: Provide a tank size of at least 20 gallons to accommodate the Gouramis and their tank mates comfortably. More space helps distribute aggression and maintains good water quality.
  4. Monitor Aggressive Behavior: Keep an eye out for any signs of aggression or stress. If aggression becomes an issue, consider rearranging decorations or providing additional hiding places to create visual barriers and break line of sight.
  5. Balanced Stocking: Avoid overcrowding the tank and maintain a balanced stocking level to prevent aggression and competition for resources. Follow recommended guidelines for the number and size of fish suitable for the tank size.

By following these recommendations and carefully selecting compatible tank mates, you can create a harmonious community tank that allows the Opaline Gouramis to thrive and exhibit their natural behaviors.


Opaline Gouramis can be bred in captivity with the right conditions and setup. Here’s some information about their breeding behavior, ideal breeding conditions, and caring for the fry (offspring).

Breeding Behavior

Opaline Gouramis are bubble nest builders, exhibiting typical breeding behavior seen in labyrinth fish. The males construct bubble nests at the water’s surface using their saliva and plant matter. During courtship, the male will perform elaborate displays to attract the female, including flaring their fins, vibrant coloration, and chasing behavior. Once the female is ready to spawn, the male will embrace her and help guide the eggs into the bubble nest.

Ideal Breeding Conditions

To encourage successful breeding, provide the following ideal conditions:

  • Separate Breeding Tank: Set up a separate breeding tank with a volume of at least 10 gallons. This allows for easier monitoring and maintenance of the breeding process.
  • Warm Water Temperature: Maintain a slightly warmer water temperature around 80°F (27°C) to simulate breeding conditions.
  • Soft and Slightly Acidic Water: Optimal water conditions include soft to moderately hard water with a pH range of 6.0 to 7.0.
  • Floating Plants: Include floating plants like Indian almond leaves, Amazon frogbit, or Water Sprite. These provide cover, shade, and surfaces for the male to build the bubble nest.
  • Dim Lighting: Reduce the intensity of the lighting in the breeding tank to create a more subdued environment, mimicking natural conditions.

Raising Fry and Specific Care Requirements

Once the eggs are laid and fertilized, the male will guard the bubble nest and tend to the eggs until they hatch, which typically takes around 24 to 48 hours. After hatching, the fry will remain in the bubble nest for a few more days, receiving nourishment from their yolk sacs.

Once the fry become free-swimming, usually within a week, they will need to be fed small, infusoria-like food or commercially available liquid fry food. As they grow, their diet can be gradually transitioned to baby brine shrimp or crushed flakes. Maintain excellent water quality and provide gentle filtration to ensure the fry’s well-being.

It’s important to note that the male may become aggressive towards other fish during the breeding and fry-raising period. Consider providing ample hiding places or separating the male if aggression becomes excessive.

Health & Disease

Opaline Gouramis, like all fish, are susceptible to certain diseases. Here are some common diseases that may affect them, along with their symptoms, as well as prevention and treatment strategies.

Common Diseases and Symptoms

  1. Ich (Ichthyophthirius multifiliis): White spots resembling grains of salt on the fish’s body, rapid breathing, flashing against objects, and loss of appetite.
  2. Fin Rot: Degradation or fraying of the fins, redness or inflammation, fin tissue erosion.
  3. Dropsy (Edema): Bloated appearance, scales sticking out (pineconing), loss of appetite, lethargy.
  4. Velvet Disease (Oodinium): Yellowish-golden dust-like coating on the skin, loss of color, rapid breathing, scratching against objects.
  5. Columnaris (Mouth Fungus): White or grayish cotton-like patches around the mouth, fins, or body, ulcers, loss of appetite.

Prevention and Treatment Strategies

To prevent and address diseases in Opaline Gouramis, consider the following strategies:

  1. Quarantine New Fish: Quarantine new fish for a few weeks before introducing them to the main tank to ensure they are healthy and disease-free.
  2. Maintain Optimal Water Conditions: Provide clean, well-maintained water with appropriate temperature, pH, and water parameters. Regular water changes and filtration are essential for maintaining good water quality.
  3. Avoid Overcrowding: Overcrowding can lead to stress and increase the likelihood of disease outbreaks. Maintain proper stocking levels to minimize stress and competition.
  4. Balanced Diet and Nutrition: Provide a varied and nutritious diet to boost the fish’s immune system. A healthy diet helps them resist infections and diseases.
  5. Observation and Early Detection: Regularly observe your fish for any signs of abnormalities, changes in behavior, or physical symptoms. Early detection allows for prompt intervention and treatment.
  6. Isolate and Treat Diseased Fish: If a fish shows signs of illness, isolate it in a separate quarantine tank for treatment. Follow appropriate medication or treatment protocols recommended by a veterinarian or experienced aquarist.
  7. Water Treatments: Treatments like quarantine baths, salt baths, or specific medications may be necessary for certain diseases. Consult with a veterinarian or experienced aquarist for appropriate treatment options and dosages.

Care Level

Opaline Gouramis are generally considered to have a care level suitable for beginners in the aquarium hobby.

Difficulty of Care

Opaline Gouramis are hardy and adaptable, making them relatively easy to care for. They can tolerate a range of water conditions and are not overly demanding in terms of their diet or tank setup. However, like any fish, they still require proper care and attention to thrive.

Special Considerations or Requirements

While Opaline Gouramis are beginner-friendly, there are a few special considerations to keep in mind:

  1. Water Quality: Although they can tolerate a range of water conditions, it is important to maintain good water quality by performing regular water changes, monitoring parameters, and providing adequate filtration.
  2. Territorial Behavior: Male Opaline Gouramis can become territorial, especially during breeding or when kept with similar-looking fish. Providing ample hiding places and visual barriers can help reduce aggression and establish territories.
  3. Adequate Space: While a 20-gallon tank is the minimum recommended size for Opaline Gouramis, providing a larger tank with more swimming space is always beneficial. It allows them to exhibit natural behaviors and reduces stress.
  4. Monitoring Aggression: Keep an eye on any signs of aggression or stress within the tank. If aggression becomes excessive, consider rearranging tank decorations or providing additional hiding places to create visual barriers.

Conservation Status

The conservation status of the Opaline Gourami, Trichopodus trichopterus, according to the IUCN Red List, has not been specifically evaluated. Therefore, there is no official listing or assessment available for this particular species.

However, it is important to note that the Opaline Gourami’s wild populations may face various conservation challenges due to habitat loss, water pollution, and overcollection for the aquarium trade. It is always advisable to support sustainable practices and responsible sourcing when acquiring fish for your aquarium.

As for legal restrictions on keeping the species in captivity, regulations can vary depending on the specific country or region. It is essential to familiarize yourself with the local laws and regulations regarding the keeping and trade of aquatic species to ensure compliance with any legal requirements.

If you have concerns or questions about the legalities of keeping Opaline Gouramis in your area, it is recommended to consult local authorities, fishkeeping organizations, or reputable aquarium stores for accurate and up-to-date information.

Additional Information & Fun Facts

Here are some interesting facts and additional information about Opaline Gouramis:

  1. Color Variations: Opaline Gouramis exhibit a range of color variations, including shades of blue, green, and pink. The intensity and distribution of colors can vary between individuals, making each fish unique.
  2. Labryinth Organ: Opaline Gouramis, like other gourami species, possess a labyrinth organ. This organ allows them to breathe atmospheric air, enabling them to survive in oxygen-deprived waters and even gulp air from the water’s surface.
  3. Bubble Nest Builders: Opaline Gouramis are bubble nest builders. Males construct elaborate bubble nests using their saliva and plant matter at the water’s surface. These nests provide a safe environment for the eggs and fry.
  4. Males’ Elaborate Courtship Displays: Male Opaline Gouramis perform impressive courtship displays to attract females. They flare their fins, intensify their coloration, and engage in chasing behavior to display their fitness and readiness to breed.
  5. Compatibility with Gourami Species: Opaline Gouramis can generally coexist peacefully with other Gourami species, such as Dwarf Gouramis. However, care should be taken when keeping multiple males together, as territorial disputes may arise.
  6. Long Lifespan: With proper care, Opaline Gouramis can live for several years in captivity. They can have an average lifespan of 4 to 6 years or even longer under optimal conditions.
  7. Community Tank Compatibility: Opaline Gouramis are popular choices for community aquariums due to their peaceful nature. They can be kept with a variety of compatible species, creating a vibrant and harmonious community tank.

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