Sailfin Tetra - Crenuchus spilurus : Complete Fish Profile & Care Guide
Table of contents
Introduction
In the world of freshwater fish, the Sailfin Tetra (Crenuchus spilurus) is known for its timid nature and peaceful temperament. However, they may not be the best fit for a community tank due to their shy disposition. It would be ideal to keep these Tetras in groups of six or more individuals, preferably with non-aggressive Characids and smaller Loricariid or Callichthyid Catfishes.
Optimal care for Sailfin Tetras entails a meticulously arranged aquarium setup characterized by a sandy substrate complemented by the inclusion of driftwood roots and branches. The addition of dried leaf litter enhances the overall aesthetic, emphasizing a natural environment. It is imperative to maintain stability within the aquatic ecosystem, as these Tetras are notably sensitive to fluctuations in organic waste levels. Thus, the introduction of biologically immature aquariums should be avoided to ensure their well-being and overall health.
During mating season, adult males may become territorial; nonetheless, adequate decor that provides plenty of broken lines of sight should prevent physical damage from occurring. These Tetras are typically found dwelling in caves in their natural habitat, hence thriving better under dim lighting. In addition, floating vegetation and aquatic plant species that can survive under such conditions can also be added.
Sailfin Tetras exhibit an elongated body profile with a subtly arched dorsal region. Their body is adorned with a silver-yellow hue that possesses an iridescent quality, complemented by a distinct lateral line running along their sides. These tetras feature a forked caudal fin and notably elongated dorsal and anal fins, with the dorsal fin extending into a trailing filament, a characteristic more pronounced in males. The fins themselves exhibit an iridescent and translucent quality, accentuated by subtle spotting. Males are further distinguished by a longer, red-hued dorsal fin that culminates in a pointed tip, while the females tend to be smaller in size and exhibit a paler colouration.
Sailfin Tetra Photos
Sexual Dimorphism
Males and females of the Sailfin Tetra can be easily distinguished based on their physical characteristics. The males are significantly larger and possess more elaborate and extended dorsal and anal fins. During the breeding season, males display a vibrant and intense colouration, becoming territorial as they prepare to mate. In contrast, females are smaller in size, have rounder abdomens, and are not as flamboyant or brightly coloured as their male counterparts.
Quick Facts
| Scientific Name | Crenuchus spilurus |
|---|---|
| Year Described | 1863 |
| Other Names | None |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Crenuchidae |
| Genus | Crenuchus |
| Origins | Guyana , Suriname |
| Max Size | 5.5 cm |
| Temperament | Peaceful |
| Aquarium Level | Bottom - Middle |
| Difficulty | Intermediate - Advanced |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg Depositor |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 4.5 - 6.5 |
| GH | 1 - 5 |
| TDS | 18 - 90 |
| ℉ | 68 - 82 |
|---|---|
| ℃ | 20 - 27 |
Natural Habitat
The Sailfin Tetra, a captivating species, is widely distributed across the Amazon and Orinoco Basins, as well as the coastal rivers of Guyana, Suriname, and French Guiana in South America. In the wild, these fish are often found in minor tributaries and forest streams, where they seek shelter in the overhanging riparian vegetation during periods of high water. Their natural habitats are also known for having water that is stained with tannins due to decomposing organic matter, providing a unique and natural environment for these fish to thrive in. So, if you're looking to create an Amazonian-inspired aquarium, the Sailfin Tetra would be an excellent addition to your tank.
Breeding
Sailfin Tetras are known to form temporary pairs during the spawning season, and they tend to choose small caves or leaf litter as their breeding sites. Males take sole responsibility for the eggs and the care of the brood. In the wild, male Sailfin Tetras build small caves at the centre of their temporary territories, often using leaf litter. You may provide any suitable structure for their breeding site in an aquarium.
The male then attracts females with dazzling fin displays and guides them into the cave to lay their eggs on the roof. Although inexperienced males may eat their first few clutches, it is advisable not to remove the eggs and hatch them artificially, as the presence of the male seems crucial for success.
The eggs usually take around 36 to 48 hours to incubate, and the fry initially feeds off their yolk sac. They become free-swimming around 4 to 6 days after hatching, and the male continues to protect them carefully during this time. You can offer the fry infusoria, newly hatched brine shrimp and microworms for their diet. It is possible to leave the parents with the fry as they are generally safe, but observing them for any signs of predation is important.
Diet & Feeding
In their natural habitats, Sailfin Tetras are known to feed primarily on small terrestrial and aquatic invertebrates, as well as other forms of zooplankton. In the home aquarium, these fish can be maintained on a diet consisting of good quality dried foods, such as flakes or granules, provided they are of a suitable size. However, to ensure their optimal health, offering them daily servings of small frozen and live foods such as daphnia, bloodworm, artemia nauplii, grindal worm, and Moina is highly recommended.
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