Onespot Squeaker - Synondontis notatus Fish Profile & Care Guide
Introduction
The Onespot Squeker, with its unique appearance and peaceful temperament, is a hardy and attractive freshwater upside-down catfish native to Central Africa. Recognisable by the characteristic single dark spot on each side of its body, though some individuals may display multiple spots, this species is popular among aquarists. These Catfish are well-suited to larger community aquariums with similarly sized, non-aggressive tankmates. Their peaceful nature reassures hobbyists of their ability to care for them, and their nocturnal habits and inquisitive nature make them a fascinating species to observe. They can thrive in captivity and make an engaging, long-lived addition to the home aquarium.
Onespot Squeakers can be kept singly or in small groups, depending on the aquarium size. While generally peaceful, they can become mildly territorial as they mature. For hobbyists wishing to keep more than one, providing a sufficiently large tank with abundant hiding spaces and visual barriers to reduce aggression is essential. This commitment to their comfort and well-being is a key part of responsible fishkeeping.
Keeping them in small groups can sometimes reduce stress and encourage natural behaviours, but avoid overcrowding, which may lead to increased territorial disputes. Tank mates should be peaceful and no smaller than 5 cm (2 inches) in length, as smaller fish may be viewed as potential prey. Suitable companions include medium-sized Tetras, Barbs, Gouramis, Knifefish, larger Loricariids, Rainbowfish, and particularly sturdy West African Cichlid species.
The aquarium should be generously sized, ideally at least 4 feet (120 cm), for juvenile specimens to accommodate their active nature and growth potential. A soft, sandy substrate is essential to protect their delicate sensory barbels from abrasion. The aquascape should feature ample hiding spots, such as bogwood, rock formations, PVC tubes, and hardy plants, to create shaded areas while maintaining a clear and open swimming space along the front of the tank. Given their substantial appetite and resulting waste production, a high-quality external canister filter is strongly recommended to maintain optimal water quality.
The aquarium should be well-oxygenated with a moderate current, which can be achieved using a suitable water pump or filter. Regular partial water changes are essential to keep nitrate levels low. Be sure to protect all aquarium heaters with suitable heater guards, as these Catfish often seek out dark, enclosed spaces to rest and may inadvertently come into contact with exposed heating elements, risking burns. These Catfish thrive under subdued lighting conditions. Adding blue moon-style illumination is particularly effective, allowing for low-stress observation of their natural nocturnal behaviour.
The body of the Onespot Squeaker is greyish-brown to olive-coloured on the back, with a gold sheen on the operculum. The ventral surface is light-colored. While most individuals display a single prominent dark spot on each side of the body, some may exhibit multiple spots, an uneven number of spots on either side or occasionally none at all. These markings are fixed from a young age and do not increase in size as the fish matures, which can cause them to appear proportionally smaller in fully grown specimens.
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Sexual Dimorphism
Sexual dimorphism in Onespot Squeakers is relatively subtle, making it challenging to differentiate the males from females, particularly in juvenile specimens. However, mature females typically exhibit a broader and more rounded body shape, especially when viewed from above, due to the development of eggs. In contrast, males tend to be slightly slimmer and may possess a more pointed genital papilla, visible upon close inspection when the fish is calm and handled carefully. There are no significant differences in colouration or fin shape between the sexes. As with many members of the Synodontis genus, sex identification is most reliable when fish are fully grown.
Quick Facts
| Scientific Name | Synondontis notatus |
|---|---|
| Year Described | 1893 |
| Other Names | One-spot Synodontis, Onespot Catfish, Domino Syno |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Siluriformes |
| Family | Mochokidae |
| Genus | Synodontis |
| Origins | Democratic Republic of the Congo |
| Approx Max Size | 25 cm |
| Temperament | Peaceful |
| Aquarium Level | Bottom |
| Difficulty | Intermediate |
| Shoaling | NA |
| Best kept as | Loners |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 10 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.0 - 7.5 |
| GH | 4 - 15 |
| ℉ | 72 - 79 |
|---|---|
| ℃ | 22 - 26 |
Natural Habitat
The Onespot Squeaker is native to Central Africa, specifically the Democratic Republic of the Congo and the Republic of the Congo. It is widely distributed throughout the Congo River Basin, including areas such as Pool Malebo and the drainages of the Kasai and Ubangi Rivers. However, it has not been recorded in Lake Mweru or the Luapula River. Additionally, populations have been reported in the Chiloango River within the Democratic Republic of the Congo. This species typically inhabits slow to moderately flowing sections of rivers, floodplain lakes, and tributaries. These waters are generally warm, well-oxygenated, and often stained with tannins from decaying organic matter. The natural environment is characterised by sandy or muddy substrates with plentiful submerged wood, rocks, and leaf litter, offering shelter and rich foraging grounds.
Breeding
The Onespot Squeaker has not yet been successfully bred in the home aquarium. In their natural habitat, these egg-scattering Catfish are known to form distinct breeding pairs, though they do not exhibit any form of parental care following spawning.
Diet & Feeding
The Onespot Squeaker is an opportunistic omnivore with a strong preference for meaty foods. In the wild, it primarily forages along the substrate, feeding on insect larvae, small crustaceans, worms, and organic detritus. In the aquarium, they readily accept various sinking foods, including high-quality carnivore pellets, catfish wafers, and frozen or live offerings such as bloodworms, brine shrimp, and blackworms. While they may consume some plant matter or algae, their diet should be protein-rich to support optimal health. As primarily nocturnal feeders, they are most active during the evening and nighttime hours, so feeding them just before or after lights out is beneficial. Regular, varied feeding supports growth and vitality and encourages natural foraging behaviour.
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Published: 09 Apr 2025
Last Updated: 09 Apr 2025