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Mystus bleekeri

Day's Mystus

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Last revised 2026Edit this page

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Day's Mystus (Mystus bleekeri)
Day's Mystus (Mystus bleekeri)JJPhoto

Quick factsEdit

Max size
155mm SL6in SL
Aquarium size
120 × 30cm48 × 12in
Temp
18–26°C64–79°F
pH
5.8–8.0
Hardness
3–30dGH

Difficulty4 of 8 measures

Easy

How the rating is worked out

Space
large tank
Water
flexible
Temp
flexible
Diet
unknown
Temperament
peaceful
Social
unknown
Compatibility
unknown

Other demands

Each of these can raise the rating on its own, whatever the measures above say.

Hardiness
unknown

Day's mystus, Mystus bleekeri, is a bagrid catfish from India, Pakistan, Nepal, Bangladesh, Bhutan, Myanmar and Indonesia. It superficially resembles the more common M. vittatus but grows larger, to around 155 mm, and has a much longer adipose fin. Peaceful and gregarious, it suits communities of larger fish, though adults will probably eat small fish, and it is more outgoing in a small group.

Distribution

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It inhabits lakes, rivers and other waterways.

Aquarium size

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Standard length
155mm SL6in SL
Aquarium base
120 × 30cm48 × 12in
Volume
~108litres~29US gal

120 ∗ 30 ∗ 30 cm48 ∗ 12 ∗ 12 in - ~108 litres~29 US gal.

Maintenance

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The decor used is not critical but the fish must be provided with some hiding places. You will see it more often if the surface is covered in floating plants to cut down the light reaching the substrate. Water chemistry is relatively unimportant as it can tolerate a wide range of conditions.

Water conditions

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Temperature
18–26°C64–79°F
pH
5.8–8.0
Hardness
3–30dGH

Temperature: 18 – 26 °C64 – 79 °F. It will probably be happier towards the upper end of this range.

pH: 5.8-8.0. We suggest you aim for a value around 7.0.

Hardness: 3-30°H

These recommendations come from this profile’s own figures. They contain affiliate links, so we may earn a commission.

M. bleekeri is an unfussy feeder, and will accept most live, frozen and dried foods. Feed a varied diet to keep the fish in good health and displaying their best colours.

Behaviour and compatibility

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A peaceful and gregarious species but it will probably eat small fish when adult. It makes a good bottom dweller for communities of larger peaceful fish. Maintain it in a small group as it is more outgoing when in the company of conspecifics.

Sexual dimorphism

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Males possess a small genital papilla located just in front of the anal fin. This resembles a single fin ray.

Reproduction

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Not thought to have been achieved in aquaria.

Notes

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This species superficially resembles the more common (in the hobby) M. vittatus, but can be distinguished by its larger adult size and much longer adipose fin. It is an ideal peaceful catfish for larger communities and as with many other bagrids, is in our opinion somewhat underrated in the hobby.

Distribution

Profile completeness19 of 24

Community

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