rummy-nose tetra
- Hemigrammus rhodostomus
- Petitella rhodostomus
Hemigrammus rhodostomus
- Hemigrammus rhodostomus
- Petitella rhodostomus
| Family | Characidae |
|---|---|
| Genus | Petitella |
| IUCN category (World) | LC |
Introduction
Petitella rhodostoma, commonly called Rummy-Nose Tetra, is a tetra native to the Orinoco and Amazon basins in Brazil. The species is known in aquariology by its former name Hemigrammus rhodostomus.
Who is it?
Morphology
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Average size4 cm
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Maximum size5 cm
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Longevity5 year
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Average size4 cm
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Maximum size5 cm
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Longevity5 year
How to recognize This fish ?
Petitella rhodostoma has an elongated, compressed body with silver reflections. The red area on the head extends to the operculum. A black mark occupies the rear of the caudal peduncle and extends forward to the anterior base of the anal fin, while the tip of the anal fin remains transparent. The maximum known total length reaches about 5 cm. These characteristics distinguish the Rummy-Nose Tetra from other similar species: Petitella bleheri and Petitella georgiae.
Sexual dimorphism
Sexual dimorphism is barely visible. Gravid females have a more developed abdomen, while the coloration remains similar in both sexes.
Behaviour & Life cycle
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dietomnivorous with carnivorous tendency
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Sociabilityliving in shoals
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territorialNo
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Way of livingdiurnal
The Rummy-Nose Tetra lives in tight and coordinated groups, occupying the entire water column of small streams. Its diet consists mainly of micro-crustaceans.
Reproduction
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Reproductionovipare qui pond en eau libre
Pairs form during spawning, with females releasing eggs freely in the water above vegetation. Fertilization is external and without parental care.
Harmless species
This species is harmless to humans.
Origin and distribution
Geographic distribution & Conservation
The species is recorded in the lower Amazon basin in Brazil, particularly in the state of Pará, with occurrences in the Capim River, around Marajó Island, and in the eastern Pará tributaries. Reports from the Orinoco basin are likely erroneous and correspond to Petitella bleheri.
Conservation status of populations (IUCN)
What is its habitat?
Natural environment characteristics
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Temperature23 - 28 °C
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pH (acidity)5.5 - 7
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gh (hardness)6 - 10
Biotope presentation
The species is found in shallow areas with slow currents and low-mineral, tannin-rich waters, with a soft substrate.
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 volume120 liters
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Population min10
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Temperature23 - 28 °C
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pH (acidity)6.8 - 7.2
Characteristics
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Difficulty breedingmoderate
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Robustnesstolerant
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Behaviourpeaceful
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Availabilitystandard
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 rummy-nose tetra
The rummy-nose tetra is a species which lives naturally at a temperature between 23 °C and 28 °C. Nitrate levels should remain below 50mg/L. To keep the water clean and unpolluted, plan on changing 20% to 30% of the water volume each month.
The breeding of this species is accessible on condition of being well informed about its needs in aquarium . Any cohabitants must be chosen with care to avoid the loss of animals.
This species is particularly common in the aquarium trade. Animals from long-term breeding are usually acclimatized at a temperature of about 26 °C in neutral water.
Jumping fish
Be careful, the rummy-nose tetra 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...
Cohabitation & Environment
Being a living in shoals fish, it is advisable to install at least 10 individuals in an aquarium of 120 liters minimum. Group maintenance is a prerequisite to ensure their well-being. Lonely individuals tend to quickly become stressed and become especially susceptible to disease. Although sometimes certain groups can "merge", mixing several gregarious species living in the same zone of life is not recommended if the volume is not consequent. The rummy-nose tetra needs a large living space, therefore it is advisable to keep it in an aquarium with a frontage of at least 100 cm.
The rummy-nose tetra is a peaceful species that generally does not exhibit behavioral problems in a community aquarium.
It should be noticed that this species should not be kept with large crustaceans or fish, as it would become a prey of choice. Smaller species should preferably be inserted in the aquarium some time before the larger ones. Moreover, if you want to breed it, it is better to put them in a specific aquarium.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.
Tips for feeding
The rummy-nose tetra is omnivorous with carnivorous tendency.
This species can eat dry food (flakes, pellets), fresh food and frozen food. To avoid deficiencies, it is recommended to vary the types 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.Food recommendations from our partner JBL - Products PRONOVO
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Granules
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Flakes
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Sticks
Reproduction protocol
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Maintenance difficultyhard
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egg-laying protectionNo
Reproduction of this species in an aquarium is considered hard. Ideally, it takes place at a temperature of around 25 ° C for a pH of 6 .
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.
Benoit Chartrer
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.
Benoit Chartrer
Scientific partners
Species of the same family
Same genus
Species of the same biotope