Black-Barred Myleus Care Guide - Aquarium Setup, Diet & Breeding

Black-Barred Myleus, Myleus schomburgkii, are large, deep-bodied relatives of the familiar silver dollar fish. Their laterally compressed, silvery body is marked by a bold dark vertical bar through the middle of the flanks, although the intensity and exact pattern can vary between individuals. Mature fish may also develop warm reddish or golden tones in the fins and body.

These are active, powerful swimmers that spend much of their time in the open water. They are strongly social and are most impressive when moving together as a group, particularly in a long aquarium that gives them room to turn and accelerate. Despite their size, they are generally peaceful toward fish too large to be swallowed.

In nature, Black-Barred Myleus are associated with flowing channels, tributaries and seasonally flooded habitats. Their deep-bodied shape and robust jaws reflect a diet that includes substantial quantities of vegetation, fruits, seeds and other plant material, supplemented by small animal foods.

This species is sometimes sold as a black-barred silver dollar, but it grows considerably larger than many of the commonly kept silver dollar species. Its adult size, active nature and need for companions make it a specialist choice for a very large community aquarium.

Black-Barred Myleus come from northern and central South America, including parts of the Amazon Basin and rivers draining the Guiana Shield, such as the Essequibo system. They inhabit warm freshwater rivers, tributaries and flooded forest areas.

A group of adult Black-Barred Myleus needs a very large aquarium of at least 500 litres, with a practical footprint of approximately 180 x 60 cm or larger; bigger groups require substantially more space. Use strong filtration and excellent water movement while leaving broad open swimming lanes. A secure lid is important because large silver dollars can jump. Sand or smooth fine gravel is suitable, with driftwood, rounded stones and sturdy decor arranged around the edges. Hardy plants such as Anubias or Java fern may be tried, although regular grazing can damage vegetation, so open swimming space should take priority.

Up to about 40 cm (16 inches) in length. Females are often deeper-bodied and may be slightly larger or heavier than males, although reported maximum sizes vary with collection locality and measurement method.

Offer a predominantly plant-based diet built around algae wafers, spirulina foods, blanched spinach, lettuce, peas, courgette and other suitable vegetables. Their menu can be supplemented with quality pellets, flakes and occasional foods such as bloodworm, brine shrimp or insect-based preparations, but animal protein should remain a minor part of the diet. Feed varied portions regularly, removing uneaten vegetables before they decay.

Black-Barred Myleus can share a large aquarium with other peaceful, robust South American fish, including large peaceful characins, severums, geophagus, peaceful larger catfish and compatible freshwater stingrays where appropriately experienced care is available. They should not be housed with tiny fish that could be eaten, delicate slow-moving species, or fin-nippers and aggressive cichlids. Their plant-eating habits also make them unsuitable for aquariums containing prized soft-leaved plants unless those plants are protected or considered expendable.

Black-Barred Myleus are egg-scattering characins and are rarely bred in home aquariums because of their adult size and demanding space requirements. In a spacious, mature breeding aquarium, a conditioned group may spawn among fine-leaved plants or other cover. The eggs are scattered freely, with no parental care, so adults should be removed or the eggs protected from being eaten. Soft, clean water, excellent oxygenation and a varied plant-rich diet can help bring fish into spawning condition.

Mature females are commonly fuller-bodied and deeper through the belly, while males may be somewhat slimmer and develop more extended dorsal or anal fins. These differences can be subtle, especially in young fish, and body shape is not a completely reliable sexing method.