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Maximum size : 7 cm

Siamese Fighting Fish - Betta Splendens : Complete Fish Profile & Care Guide

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The captivating Siamese Fighting Fish, Betta Splenden, is a popular and beloved species in the world of fishkeeping. Their vibrant colours and flowing fins have captivated enthusiasts for decades, making them a staple in the aquarium hobby. Despite their aggressive nature towards other male bettas, this unique species continues to charm fish enthusiasts worldwide. It is vital to keep them separately in their own tanks to prevent aggression and ensure their happiness and well-being. Keeping Bettas in small bowls or vases is inhumane and not recommended; they require at least several gallons of water, a filter, and a heater to thrive. Breeders have developed a wide range of colours, patterns, and fin shapes in this species, including yellow, blue, red, green, and turquoise, with various pigmentation layers. With different colour patterns such as butterfly, bi-colour, and marble, and metallic shades like gold and platinum, Bettas continue to evolve and remain a favourite in the aquarium hobby.

Siamese Fighting Fish Photos

Sexual Dimorphism

In discerning the sex of Siamese Fighting Fish, males stand out with their vibrant and striking colours and extended fins, which are often more prominent in various ornamental strains. In contrast, the female bettas are generally less colourful in appearance. The distinguishing characteristics between the two sexes are evident, making it easy for aquarists to identify and appreciate the distinct features of these captivating fish.
Featured Male
Featured Female
Male Female

Quick Facts

Scientific NameBetta Splendens
Year Described1910
Other NamesBetta
OriginsCambodia Laos Vietnam Thailand
Max Size7 cm
Aquarium LevelTop
DifficultyBeginner - Intermediate
Best kept asLoners
ReproductionBubble nest
Lifespan3 - 5 years

Water Parameters

Water TypeFreshwater
PH6.0 - 8.0
GH5 - 20
TDS18 - 268
75 - 82
23.9 - 27.8

The Siamese Fighting Fish has been featured on the following stamps.

Natural habitat

The Siamese Fighting Fish is a true jewel of Southeast Asia, endemic to the Mekong basin of Cambodia, Laos, Vietnam, and the Chao Phraya River in Thailand. These captivating fish are often found in standing, sluggish waters, ranging from rice paddies and ponds to roadside ditches and swamps. Their habitats are typically shaded by a lush array of marginal vegetation, creating a picturesque scene. The Siamese Fighting Fish's natural environment is unique and ever-changing. During the annual monsoon season, their water conditions can shift rapidly, posing a challenge for these resilient fish. Nevertheless, they adapt quickly to the varying substrates, which can range from deep silt to sand, mud, or leaf litter. These fascinating fish prove to be an excellent study in adaptation and survival.
 Mekong River - Vietnam
Vietnam Flag

How to breed the Siamese Fighting Fish

The Siamese Fighting Fish, is a bubble-nesting species that requires adequate cover for successful breeding. You can use plastic tubing or incorporate floating plants to provide potential nesting sites for the female. It is essential to have a tight-fitting lid on the aquarium to maintain a warm, humid environment necessary for proper development of the labyrinth organ of the fry. Separating the pair before spawning is unnecessary. The male will construct the nest under a broad plant leaf, among fine-leaved surface vegetation, or in a tube, and will only allow the female in the vicinity when the nest is complete. During spawning, the female will become paler in colour, and dark bars will appear on the sides. The male will wrap himself around the female as they embrace, releasing milt and a few eggs, which the female will catch between her pelvic fins and body. The male will transfer these to the nest, while the female collects any loose eggs. This process is repeated until the female has laid all her eggs. Once spawning is complete, the adults can remain in the tank. However, the female is no longer involved in the breeding process, and the male will take sole responsibility for guarding and managing the nest. The eggs will hatch within 24 to 48 hours, and the fry will remain in the nest for an additional three to four days until the yolk sac has been fully consumed. The male will continue to collect and return any fry that fall, moving the entire nest elsewhere if he feels threatened. After the fry become free-swimming, they require infusoria-grade food for the first few days, followed by foods such as artemia nauplii and microworm. Regular small water changes are recommended for optimal fry health, rather than large and infrequent changes.

Diet & feeding

The Siamese Fighting Fish is a carnivorous species that can be fed with high-quality dried foods, such as flakes and granules, once they are introduced to them. However, to maintain optimal health and coloration, it is essential to supplement their diet with small live or frozen foods, such as artemia, daphnia, and bloodworms. To provide a varied diet, small insects like fruit flies or pinhead crickets are also suitable food for them. However, it is crucial to ensure that the insects are well-fed with fish flakes or vegetable matter before feeding them to the fish. This practice will help to prevent any nutritional deficiencies in the Siamese Fighting Fish and promote their overall well-being.

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