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Maximum size : 3.5 cm
Dwarf Pencilfish - Nannostomus marginatus : Complete Fish Profile & Care Guide
Table of contents
Introduction
The Dwarf Pencilfish (Nannostomus marginatus) stands out as the smallest member of its species. These charming and peaceful fish can be somewhat shy, tending to hide and refuse food if their tankmates are overly exuberant. To create a comfortable environment for these tranquil mid-to-top-dwelling fish, set up a well-established aquarium with a dark substrate and background, and ample plant life, including both rooted and floating varieties. Efficient filtration and gentle water movement are crucial. Ideally, maintain these fish in groups of at least 10, with larger groups preferred if possible. Occasional disputes may arise among dominant males, but a well-designed habitat with numerous hiding spots and visual barriers can mitigate potential harm. A higher female-to-male ratio can further alleviate minor aggression concerns. In the wild, these fish share their habitat with an array of small characins, including Axelrodia stigmatias, and various Copella and Hemigrammus species. Dwarf Cichlids from the Apistogramma or Mikrogeophagus genera, as well as Corydoras Catfish and small loricariids, can also be considered suitable tankmates. Sporting a silver body, these fish captivate observers with their two striking black horizontal stripes that extend from head to tail. Additionally, they feature a distinctive red patch at the base of the caudal fin, nestled between the primary and secondary dark lateral lines, adding a touch of vibrancy to their appearance.Dwarf Pencilfish Photos
Sexual Dimorphism
Distinguishing between male and female Dwarf Pencilfish is a straightforward task. Males exhibit a more slender physique and more intense coloration compared to females. Additionally, some males have a modified anal fin with the third to sixth rays being widened, further aiding in differentiation.Quick Facts
| Scientific Name | Nannostomus marginatus |
|---|---|
| Year Described | 1909 |
| Other Names | |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Lebiasinidae |
| Genus | Nannostomus |
| Origins | Guyana Suriname |
| Max Size | 3.5 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner |
| Shoaling | No |
| Best kept as | N/A |
| Diet | Omnivore |
| Reproduction | Egg-Layer |
| Lifespan | 2 - 5 years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| PH | 5.5 - 7.5 |
| GH | 3 -10 |
| KH | |
| TDS |
| ℉ | 75 - 79 |
|---|---|
| ℃ | 23.9 - 26.1 |
Natural Habitat
Prepare to be transported to the exotic backwaters, tributaries, and swamplands of Guyana and Suriname, where the stunning Dwarf Pencilfish can be found thriving in their natural habitat. These exquisite creatures inhabit the soft, acidic waters of Maduni Creek, creating a serene and tranquil environment that is perfect for observing their beauty. But the wonder of this species doesn't stop there - you can also find them in the middle to lower Amazon Basin East of the Andes Mountains in Brazil, Peru, and Colombia. Here they can be found in the Essequibo River, Demerara River, Nickerie River, Inírida River, Caquetá River, Ucayali River, Javari River, Putumayo River, Napo River, Juruá River, the Rio Negro, Branco River, and the Trombetas River. In these breathtaking waterways, the Dwarf Pencilfish gracefully maneuvers through the almost still, shallow waters, surrounded by a dense and vibrant vegetation, creating a picturesque and lively scene. The waters are stained a warm, tea-like color from the tannins in the decaying wood and leaves, providing a unique and fascinating backdrop for observing these stunning fish in their natural habitat. For those with a passion for aquatic life and nature, the opportunity to encounter the Dwarf Pencilfish in their natural habitat is a once-in-a-lifetime experience. Witnessing their vibrant colours and playful behaviour in such a serene environment is truly a sight to behold.
Rio Napo - Ecuador
Nickerie River - Suriname
Essequibo River - Guyana
Demerara River - Guyana
Japurá River - Colombia
