Edit Nannostomus marilynae

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Name

Scientific name

Nannostomus marilynae

Described by

Authority Weitzman & Cobb, Year 1975

Family

Lebiasinidae

Common names

Greenstripe Pencilfish

Photograph credits

All 3 credited

Summary

The greenstripe pencilfish, Nannostomus marilynae, occurs in the rio Negro in Brazil and the Río Vichada in the upper Orinoco basin, Colomb…

Size and aquarium

Maximum size

35mm, standard length

Aquarium size

Minimum length 60 cm, Minimum depth 30 cm, Water movement Low: still or sluggish water

Water

Water conditions

Temperature 21–28°C, pH 4–6.5

Hardness

1–10dGH

Conductivity

Not recorded

Behaviour

Temperament

Peaceful

Community suitability

Not for a community

Where it lives

Countries, regions, rivers and lakes

Brazil, Colombia, Negro, Orinoco, Vichada

Writing

Etymology

Nannostomus: from the Latin nannus, meaning 'small', and Greek stoma, meaning 'mouth', in reference to the small mouthparts of member species. marilynae: named…

Distribution

The type series was collected from 'rock pools below rapids, São Gabriel,' which probably refers to the city of São Gabriel da Cachoeira which lies on the rio …

Habitat

Likely to inhabit sluggish tributaries, small rivers and swampy areas, particularly in areas with dense growth of aquatic vegetation or submerged woody structu…

Aquarium size

Base dimensions of at least 60 ∗ 30 cm or equivalent are necessary.

Maintenance

Should ideally be kept in a heavily-planted set-up, preferably with a dark substrate. The broken lines of sight that exist in such a display allow it to displa…

Water conditions

Not written yet

Diet

A micropredator feeding on tiny invertebrates and other zooplankton in nature. In the aquarium it will accept dried foods of a suitable size but should also be…

Behaviour and compatibility

Relatively peaceful and will not compete well with very boisterous or much larger tankmates. In a community it's best kept with similarly-sized, peaceful chara…

Sexual dimorphism

Adult males are usually slimmer and more intensely-patterned than females. Males also possess a slightly modified anal-fin with the anterior 5-6 branched rays …

Reproduction

Has been achieved in aquaria, albeit rarely, and in a densely-planted, mature aquarium it's possible that small numbers of fry may start to appear without inte…

Has been achieved in aquaria, albeit rarely, and in a densely-planted, mature aquarium it's possible that small numbers of fry may start to appear without intervention.

However if you want to increase the yield of fry a slightly more controlled approach is required.

The adult group can still be conditioned together but one or more smaller containers should also be set up and filled with aged water.

Fill much of the available space with fine wool mops, Taxiphyllum or other fine-leaved aquatic plant.

Neither lighting nor filtration is necessary although you can install a small air-powered sponge filter if you prefer.

When the adult fish are well-conditioned a single pair or group comprising one or two males and several females can then be introduced to each container, though it's worth noting that the more individuals involved the greater the risk of egg predation, plus males may distract each other from females if there's more than one in the tank.

The adults can be removed after 2-3 days and the first fry should be visible a day or two later.

Initial food should be Paramecium or a proprietary dry food of sufficiently small (5-50 micron) grade, introducing Artemia nauplii, microworm, etc., once the fry are large enough to accept them.

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Where does this come from?

My own experienceFor example, I've kept twelve in a planted 60 cm tank since March 2024.A website I sawFor example, an IUCN Red List assessment, a museum catalogue or a FishBase page.A paperFor example, Marshall et al. (2011), Water temperature differences in interfluvial palm swamp habitats of Paracheirodon axelrodi and P. simulans.A book, or something not onlineFor example, Tappin (2010), Rainbowfishes: their care and keeping in captivity.Something already on the pageFor example, the Behaviour and compatibility section already says this.

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DOI

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Authors

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Year

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Pages

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Anything worth adding

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Notes

This species is also known as 'Marilyn's pencilfish'. It's rarely traded in numbers and more often seen as bycatch among shipments of other species, particular…

References

3 on this profile

Name

Scientific name

Described by

Family

Common names

Photograph credits

Summary

Size and aquarium

Maximum size

Aquarium size

Water

Water conditions

Hardness

Conductivity

Behaviour

Temperament

Social needs

Community suitability

Where it lives

Countries, regions, rivers and lakes

Writing

Etymology

Distribution

Habitat

Aquarium size

Maintenance

Water conditions

Diet

Behaviour and compatibility

Sexual dimorphism

Reproduction

Notes

References

References