Introduction
The Foersch's mouthbrooder is a small osphronemid endemic to southern Borneo (Kalimantan Tengah, Indonesia), described in honor of Dr. Walter Foersch. It belongs to the group of Betta species from blackwater peat forest, adapted to very acidic and mineral-poor environments.
Who is it?
Morphology
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Average size5 cm
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Maximum size7 cm
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ShapeRectangular
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Average size5 cm
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Maximum size7 cm
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ShapeRectangular
How to recognize This fish ?
Like all fish of its genus, the Foersch's mouthbrooder has the particularity of being able to breathe in two different ways. In addition to the classic gills, this species is equipped with a breathing apparatus called Labyrinthe which allows it to absorb oxygen from the air. These species are commonly called the labyrinth Fish.
The species reaches about 7 cm in total length. The body is slender, mouth terminal, and the labyrinth organ allows for facultative air breathing. The coloration varies with mood and context, with stronger contrasts in males, whose fins are moderately developed and adapted to calm, vegetation-filled streams.
Sexual dimorphism
The male is more brightly colored and often more slender, while the female has a duller appearance. Color and fin contrasts intensify during breeding periods.
Behaviour & Life cycle
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dietcarnivorous
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Sociabilityliving as a couple or in a group
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territorialYes
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Way of livingdiurnal
The Foersch's mouthbrooder is discreet and opportunistic, splitting its time between leaf litter and the water surface film. It hunts small benthic prey (insect larvae, microcrustaceans) by sifting through roots and dead wood, but also captures insects and arthropods that fall to the surface under the vegetation cover. Facultative air breathing (labyrinth organ) allows it to exploit oxygen-poor water pockets. Territoriality is moderate and mainly related to reproduction, with brief interactions near hiding spots.
Reproduction
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Reproductionovipare incubateur buccal
The Foersch's mouthbrooder is a paternal mouthbrooder. After fertilization, the male gathers the eggs in his mouth and incubates them until hatching, sheltered in calm areas under vegetation cover. Old mentions of bubble nests exist in the literature, but current consensus confirms mouthbrooding in this species.
Harmless species
No known danger to humans.
Origin and distribution
Geographic distribution & Conservation
The species is confirmed in the basins of the Mentaya (Sampit), Sebangau, and Kahayan rivers in Kalimantan Tengah. Populations in the Jelai basin described as Betta strohi are now often considered conspecific with B. foerschi sensu stricto. Demographic trends are unknown, and the species only sporadically appears in the aquarium trade. Peat swamp forest degradation, resulting in the loss of blackwater habitats, poses a long-term high risk and justifies increased monitoring.
Conservation status of populations (IUCN)
What is its habitat?
Natural environment characteristics
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Temperature22 - 25 °C
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pH (acidity)4 - 6
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gh (hardness)1 - 4
Biotope presentation
The Foersch's mouthbrooder inhabits streams in tropical forests associated with peatlands, in very soft blackwaters (dH 0–4) and acidic waters (pH 4–6, typically around 5.2), low in minerals and temperature between 24 and 26 °C. The habitat is shallow, slow-moving, dark, and cluttered with leaf litter, dead wood, and roots.
Species of the same biotope
Main recommendations for fishkeeping
Deontology
In order to preserve wildlife, if you acquire this animal, it must not be released into the wild. See also, the Fishipedia charter.
Fishipedia supports the practice of responsible and environmentally friendly aquarium keeping. We encourage maintenance if it is motivated by a desire to understand the biological functioning of living things and if it is done with respect for animal life.
We believe that aquaristics is an opening to the discovery of aquatic environments, especially freshwater, and that this knowledge is necessary to better protect and respect these environments. Logically, we refute the compulsive purchase of animals that would not find a sufficient and / or adapted place in the host aquarium.
Our recommendations
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Min volume60 liters
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Population min1
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Temperature22 - 25 °C
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pH (acidity)4 - 6
Characteristics
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Difficulty breedingvery difficult
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Robustnesssensible
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Behaviourpeaceful
Recommended equipment from our partners
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Aquarium
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Filtration
General reminders
It is strongly advised to read the complete dedicated file and to get information on the feedbacks of maintenance of the envisaged animal, this to avoid any potential conflict whose end result is generally the death of the individual (or the other inhabitants). It is important not to overload your aquarium to limit pollution. This will make maintenance easier.
In nature, animals are subject to weather conditions and live in waters with variable characteristics. The recommendations offered by our team for aquarium maintenance are a guidance and cannot be assimilated to scientific datas.
General reminder on maintenance datas
Le démarrage d'un aquarium est une partie primordiale pour l'équilibre et le bien-être des poissons. Lorsque l'on met en eau un aquarium, l'eau passe naturellement par un cycle biologique : le cycle de l'azote. Celui-ci dure environ trois semaines. Tous les 2 jours, nous vous conseillons de tester votre eau jusqu'à ce que le taux de nitrite soit à zéro pendant plusieurs jours d'affilée.
Pour accélérer ce cycle, vous pouvez utiliser un activateur de bactéries comme JBL Denitrol. Cette solution riche en bactéries vivantes et enzymes permet une mise en place rapide du cycle de l'azote. Les poissons peuvent alors être introduits plus rapidement.
Il est important de tester l'eau de son aquarium régulièrement pour maintenir un environnement sain pour les poissons et les autres habitants. Les tests d'eau permettent de mesurer les niveaux de différents paramètres tels que le pH, la dureté totale, ainsi que les taux de nitrates, de nitrites et d'ammoniaque.
Pour réaliser ces tests, vous pouvez utiliser des produits d'analyse spécialisés tels que JBL ProScan qui permet de réaliser un diagnostic de l'eau directement via un smartphone. Il existe également des coffrets de tests plus classiques de bandelettes, comme JBL PROAQUATEST.
En cas d’usage de l’eau du robinet, vous pouvez utiliser un conditionneur d’eau de type Biotopol de JBL pour éliminer les substances nocives comme le chlore, le cuivre, le plomb et le zinc. Une eau trop dure ou trop calcaire peut être inadaptée à de nombreuses espèces tropicales d’eau douce. Si nécessaire, vous pouvez la couper avec de l’eau osmosée ou de pluie filtrée afin d’obtenir une dureté plus adaptée aux besoins de vos poissons et de vos plantes. Les conditionneurs d'eau garantissent une meilleure santé aux poissons et une meilleure croissance des plantes.
Chlorine and chloramine are dangerous for the health of animals. Used to disinfect water, these agents are present in significant quantities in tap water. We recommend using an anti-chlorine agent every time you change the water. In addition to chlorine, treatments and medicines sold for aquarium use sometimes contain dangerous heavy metals in high doses.
Specific needs for the Foersch's mouthbrooder
The Foersch's mouthbrooder is a species which lives naturally at a temperature between 22 °C and 25 °C. The Foersch's mouthbrooder is sensitive to abrupt changes in parameters as well as to chemicals. Its acclimation in an aquarium must be done with special care to prevent it from developing diseases or weaknesses. Nitrate levels should remain below 25mg/L. To keep the water clean and unpolluted, plan on changing 20% to 30% of the water volume each month.
The Foersch's mouthbrooder is a species whose maintenance is rather reserved for informed aquarists . It can only be successfully carried out by carrying out a minimum of documentation work. Special husbandry conditions can easily lead to the death of the species or other animals.
Jumping fish
Be careful, the Foersch's mouthbrooder is an excellent jumper, naturally using this faculty to change its living area or to escape from predators. The aquarium must be perfectly covered to prevent him from making a deadly jump...
Fish with a maze
The ability to breathe at the surface makes this fish more likely to live in small volumes. Naturally, the Foersch's mouthbrooder can be found for long periods in water holes where oxygen is scarce.
Cohabitation & Environment
The Foersch's mouthbrooder is a fish which it is advisable to maintain in specific aquarium. A 60 liter tank is sufficient to consider its breeding. Associating it with other species is not fundamentally impossible but a documentation work is necessary for the constitution of the population.
The Foersch's mouthbrooder is a fish that generally lives in groups outside of the reproduction periods. If you want to reproduce them and have a good chance of forming a couple, it is recommended to keep at least 5 individuals.. In a community aquarium, the chances of survival of the larvae are almost null. After a few spawns, it is preferable to isolate the couple or to separate from the other members of the group.
The hierarchical organization and the aggressiveness between fellow fish can weaken certain individuals, the presence of hiding places becomes then necessary. If you wish to add new members, it is better to introduce younger fish. They will have a better chance of integrating into the new balance.
The species enjoys a particularly vegetation-rich environment. The addition of plants will provide many useful hiding places for resting. These areas are also conducive to possible breeding in the aquarium. Floating plants such as Salvinia can be added to recreate the subdued atmosphere characteristic of its living conditions in the wild.
Acid Water Maintenance
The Foersch's mouthbrooder living naturally in acidic water, generally in "black" or "sieved" water, the implementation of a filtration on peat is ideal for its balance. Adding decaying leaves and alder fruit can significantly improve living conditions by naturally increasing acidity of some water.Tips for feeding
The Foersch's mouthbrooder is carnivorous.
This species does not appreciate being fed with freeze-dried food (flakes...). Some specimens will never eat this type of food.
Feed animals in moderation to maintain good water quality. Meals should be eaten within 2–3 minutes, served in several small portions rather than a single large ration.
Uneaten food quickly decomposes, releasing ammonia, nitrites, and nitrates, which disturb the aquarium’s biological balance.
Make sure each species can access food properly, slower or bottom-dwelling individuals may require targeted feeding.Reproduction protocol
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Maintenance difficultyhard
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egg-laying protectionYes
Hybridization risks
In general, it is advised not to mix several species of the same genus or different varieties of the same species, to avoid the risks of hybridization.
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To go further
Sources & Contributions
Participation & Validation
The Fishipedia team and specialist contributors are committed to providing high-quality content. However, although the information comes from scientific sources or testimonials from specialists, the cards may contain inaccuracies.
Translation
Translation done with the valuable contribution of our translators, who make this information available to a wider audience. We sincerely thank them for their commitment.