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Siamese Fighting Fish (Betta Splendens) - Proper care, mating and forum

All pictures were provided by Laura M. Schlögl. Siamese Fighting Fish, picture 1 Siamese Fighting Fish, picture 2 Siamese Fighting Fish, picture 3 Siamese Fighting Fish, picture 4 Siamese Fighting Fish, picture 5 Siamese Fighting Fish, picture 6

Brief Description

This page offers information and tips on raising Siamese fighting fish - from diet to raising the fry. Bear in mind we'd love to hear about your Bettas, so share your story at the bottom of this page, please and as we also have other pages devoted to more specific issues related to housing this beautiful species, you should visit the following pages too: Siamese fighting fish - Betta splendens profile with large forum, FAQ on raising Bettas, Diseases of Siamese fighting fish, with recommended treatment and 10 tips for a successful Betta splendens reproduction (VERY POPULAR ARTICLE).


Siamese Fighting Fish are one of the most popular and beautiful aquarium fish available. They come in a wide range of colours and the male of the species have long flowing fins. They are also capable of surviving in many different conditions. Many were once sold in a vase with a lily in the top, and you still see them kept in cups and small jars which is far from ideal for the Siamese Fighting Fish, although they will tolerate these conditions indefinitely, however it doesn’t mean to say they are happy! It is never recommended to keep a fish in less than 2 gallons (~9 litres, 2.4 US gallons) of water, which should either be filtered or changed regularly and I personally abhor the practice of “Jarring”, keeping them in 1-2 pints (1/2 – 1 litres) of water.

The name Siamese Fighting Fish came from when they were first used by gamblers in the Far East. They would put two males together and watch them fight, often to the death of one, for money. B. splendens are one of a few species of male fish that will not tolerate any other males in their vicinity. The origins of their aggression are unknown, but it is believed by some to be a natural territorial behaviour. However, through persistent captive breeding, this aggression has been increased to an unnatural level.


Siamese Fighting Fish originate from the paddy fields, gullies and streams of South East Asia, and are found mainly in Thailand, Borneo and South Vietnam. They thrive in stagnant ponds and slow-moving water. Because of their Labyrinth, a special “lung”, they can survive in water with very little oxygen by coming to the surface periodically to breathe. In fact, they have been known to drown if they cannot get to the surface!


They need warm water, between 75°F (24°C) and 84°F (29°C), but can tolerate a wide range of water alkalinity/acidity (pH), anywhere between 6 and 8. The tank should also have a tight-fitting cover, as Siamese Fighting Fish are excellent jumpers and will often die through jumping out of the water onto the counter. Another reason for the tight lid is to keep the air temperature as close as possible to the water temperature, so that they don’t catch pneumonia by breathing cold air.

Most people would recommend that these males are solitary fish, kept in tanks on their own, and in most cases, this is wise. They can be kept in communities though, with other fish species, so long as care is taken to ensure that there are no small fry, fin-nippers, similar looking fish such as fancy guppies, other male B. splendens or very fast fish in the tank with the Siamese Fighting Fish. You can keep them with betta females, as long as there are several females. These fish are slow movers, (except when stalking or mating), and very susceptible to damage not only from other tank mates, but also from sharp objects or corners on ornaments. Similar looking fish, like the fancy guppy could be mistaken as competition and create problems for you too.

The tank should be well equipped with hiding places, plants, rocks or ornaments, as these fish like to hide and hunt. Live food such as blood worms, cut up earth worms, baby brine shrimp and daphnia are very quickly consumed, and the diet should also include vegetables such as crushed peas, sliced cucumber or aubergine.

Temperament and breeding

Not all Siamese Fighting Fish are super-aggressive. Much depends on the way they are bred. If they are bred in a community the aggression is much less than if they are bred in separate jars. The aggression factor is further increased if they are not allowed to see any other Siamese Fighting Fish while growing to adult. “Carding”, (placing card between each jar to obscure the view of other fish), is very common amongst breeders of Siamese Fighting Fish for this very purpose, although many breeders will give the excuse that by constantly “flaring” at each other, they get tired. (Flaring is the term used to describe the spreading of gill covers and fins in a display of aggression.)

Personally I have successfully bred Betta splendens in a community with very little sign of trouble. I consider this to be successful if they can co-exist as a community until 6 months old, when the males are very noticeable. As juveniles, they will flare at each other, but I have not had any fatalities or even serious aggression displayed. Usually one of the males will quickly submit and swim away, doing a headstand to show his submission. Once this happens, the winning male flares and swims away too. At 6 months old, males should be taken out and give them their own space, but still allow them to see other specimens.

Females of the species are usually much more placid, and don’t carry nearly as much finnage. They can exist happily in a community indefinitely, either in groups of 6 or more females, or with one male and a group of females. As with all things, there are exceptions to the rule, so this is something that you need to watch for when putting several Siamese Fighting Fish females together.

Siamese Fighting Fish, picture 7 Siamese Fighting Fish, picture 8 Siamese Fighting Fish, picture 9 Siamese Fighting Fish, picture 10 Siamese Fighting Fish, picture 11 Siamese Fighting Fish, picture 12

Although these are easy fish to breed, it is unwise to do so unless you have the ability to cope with the offspring. Siamese Fighting Fish are “Bubble-nesters”, which means that they build a nest of saliva covered air bubbles on the surface of the water or under a large leaf or similar, and when they mate, the male will catch the eggs from the female and blow them into the nest.

If you do intend to breed these fish, you need to ensure that you have enough tanks and equipment to cope with both adults and fry. The breeding tank should be no less than 15 gallons (~ 68 litres, 18 US gallons) and large enough to allow the female to escape from the male. It should be furnished with lots of hiding places, plants large leaves, rocks etc. and have either floating plants or a polystyrene cup, cut in half, floating on the water. The temperature needs to be 80°F (27°C) and filtering should be by air using a sponge filter. During mating, the filter should be turned off. Almond leaves, extract or Betta Spa will all aid in the mating process.


Mating is often a very drawn out process, and can take several hours, but is beautiful to watch. The male will build the nest, entice the female under it and then they go into an embrace, the male wrapping himself around the female while she releases some eggs. He fertilises them as she releases and then lets her go while he chases the eggs, collects them up and blows them into the nest. The female will appear stunned for several seconds after each embrace, then once she recovers, goes straight back to the male and the process is repeated until all the eggs are released. This can be up to 400 eggs.

Once mating has finished, the male will chase the female away from the nesting site and this is a good time to remove her to a recovery tank. The male will attend the nest and subsequent fry for the first 5-7 days, during which time he will not eat. He needs to be removed too after this time, or he may see the fry as food!

It is most important that the breeding tank has a tight fitting lid at all times while the fry are growing, since they are extremely delicate and will succumb to pneumonia very easily. Most fry are lost during the early stages of development because of this.

The fry

The fry are free-swimming by day 6, and will only be able to eat very small foods, such as fresh baby brine shrimp or infusoria for the first 4 weeks. (You need to setup a hatchery for BBS that can maintain an adequate supply daily.) After this time you can start to introduce finely ground flake food as a supplement to the BBS, and gradually wean them off the brine shrimp by week 10. By now you should be able to tell males from females and need to watch for aggressive males and remove to separate breeding tanks if necessary. It is quite possible that you could have 100 males from a single sporn, so you need to be able to make arrangements for their separation should it be required.

By week 16, they are normally large enough to sell on to your local store or friends. If you plan to keep them yourself, invest in a lot of tanks now!

Betta fish Siamese Fighting Fish, picture 13 Siamese Fighting Fish, picture 14 Siamese Fighting Fish, picture 15 Siamese Fighting Fish, picture 16 Siamese Fighting Fish, picture 17

Siamese Fighting Fish, picture 18 Siamese Fighting Fish, picture 19 Siamese Fighting Fish, picture 20 Siamese Fighting Fish, picture 21 Siamese Fighting Fish, picture 22 Siamese Fighting Fish, picture 23

Siamese Fighting Fish, picture 24 Siamese Fighting Fish, picture 25

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