Armoured Stickleback - Indostomus paradoxus Fish Profile & Care Guide
Introduction
Armoured sticklebacks (Indostomus paradoxus) are an enigmatic species originating from the diverse aquatic landscapes of Southeast Asia. Characterized by its armored body and intricate patterns, this species exhibits a fascinating blend of camouflage and resilience. The ecological role of Indostomus paradoxus, coupled with its unique physiological attributes, underscores the complexity of aquatic ecosystems and the biodiversity within them. As such, it captivates the interest of researchers and enthusiasts alike, providing valuable insights into the dynamics of freshwater habitats.
Owing to their dietary preferences and inherently reserved demeanor, Indostomus paradoxus, a notably distinctive species, exhibits optimal health and social behavior when housed in a cohort of five or more. Such arrangements are ideally conducted within a species-specific aquarium or alongside other tranquil and comparably slow-moving companions. Danionella, Dario, and Boraras species are all considered appropriate companions for cohabitation within the aquarium environment. Despite their congenial nature towards conspecifics, these fish possess a diminished competitive edge, rendering them ill-suited to cohabitate with more assertive species.
Armoured Sticklebacks thrive in aquascapes that closely replicate their natural habitats, necessitating a setup abundant in dense aquatic flora and a foundation of soft sand, although a substrate of finely granulated gravel is also acceptable. Nano setups are particularly well-suited for this species, accommodating their needs perfectly. The aquarium should be augmented with a variety of refuges, such as caves, areas with heavy plant growth, and driftwood, to provide ample hiding and resting spaces.
The incorporation of floating vegetation and leaf detritus not only enhances the habitat's structural complexity but also moderates light penetration, creating a subdued ambiance that mimics their indigenous settings. Preference is given to well-oxygenated conditions with minimal water flow, necessitating the use of gentle filtration systems to circumvent the stress induced by vigorous currents.
The physical appearance of the Armoured Stickleback is distinguished by its dark brown hue, adorned with numerous brown markings and a light throat area. The body is encased in armor, slender, and tapering towards the caudal region, culminating in a diminutive, fan-shaped tail, adding to its distinctive morphology.
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Sexual Dimorphism
Distinguishing between male and female Armoured Sticklebacks can present a challenge due to their closely resembling appearances. However, upon closer examination, adult males can be identified by their broad, elongated pelvic fins, which feature outer rays curving inwards. In contrast, females exhibit pelvic fins that are straight and more slender. Additionally, females will display a more rounded and robust physique when gravid with eggs, providing another indicator for differentiation.
Quick Facts
| Scientific Name | Indostomus paradoxus |
|---|---|
| Year Described | 1929 |
| Other Names | Burmese Dwarf Stickleback, Paradox Fish |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Gasterosteiformes |
| Family | Indostomidae |
| Genus | Indostomus |
| Origins | Myanmar |
| Approx Max Size | 3 cm |
| Temperament | Peaceful |
| Aquarium Level | Bottom - Middle |
| Difficulty | Beginner - Intermediate |
| Shoaling | NA |
| Best kept as | Groups 5+ |
| Diet & Feeding | Carnivore |
| Reproduction | Egg Depositor |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 7.5 |
| GH | 6 - 10 |
| ℉ | 72 - 81 |
|---|---|
| ℃ | 22 - 27 |
Natural Habitat
The Armoured Stickleback is indigenous to the northern reaches of Lake Indawgyi, near Nyaungbin, within Kachin State, Northern Myanmar, a region in Southeast Asia. Its presence has been documented in the tributaries of the Irrawaddy River in proximity to Myitkyina, the state capital. Recent discoveries have traced its habitat to areas considerably further south, near Einme town in the river's deltaic area, suggesting its habitat range is more expansive than previously recognized.
This species thrives in environments characterized by slow-moving or static freshwater bodies, such as wetlands, streams, ponds, and oxbow lakes, across both clearwater and blackwater ecosystems. Habitually, Indostomus species are found in areas rich in aquatic vegetation, algae, and decomposing organic matter, including leaf litter and branches, highlighting their adaptability to diverse aquatic environments.
Breeding
The Armoured Stickleback has been successfully bred in captivity on multiple occasions, with spawning typically taking place within small, secluded environments such as caves or crevices. These can include both natural and artificial structures, like segments of bamboo or plastic pipes.
Male individuals select and rigorously defend a chosen spawning site, establishing a territory extending a few centimeters in every direction.
Throughout the spawning phase, males exhibit a noticeable change in coloration, adopting a lighter, more reddish hue along with a distinct light brown stripe across their dorsal and anal fins. Courtship behaviors involve males displaying erect fins and performing quivering motions with their caudal regions at the spawning site's entrance to attract females.
Females, when ready to spawn, exhibit a lighter coloration and the genital papilla becomes conspicuously visible. The spawning act often sees eggs being laid on the ceiling of the chosen site, with both participants inverted. This process can occur through multiple bouts, with females temporarily exiting the site between each. A typical spawning session yields between 5 to 40 eggs.
After spawning, the female departs, leaving the male to exclusively care for the brood. This duty involves staying close to the spawning site, venturing out only briefly for nourishment. The male continues this vigilant care until the fry achieves free-swimming capability and begins to disperse.
In well-established aquariums free from predators, there exists a possibility for some fry to naturally survive. Alternatively, fry may be transferred to a separate container for more focused care, although this proves challenging due to their diminutive size at birth. Initially, the fry necessitates microscopic food sources such as Paramecium or rotifers.
Diet & Feeding
Primarily engaging in micro predation, Armoured Sticklebacks subsist on an array of diminutive aquatic organisms, including crustaceans, annelids, larval insects, and various zooplankton. Within controlled environments such as aquariums, observations suggest a marked preference for live dietary sources over dried or frozen alternatives. It is recommended to provision small, live nourishment options, such as microworms, mini bloodworms, and baby brine shrimp. In well-established, vegetated aquatic settings, the indigenous microfauna may serve as a valuable supplementary alimentary resource.
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Published: 15 Mar 2024
Last Updated: 15 Mar 2024