Eirmotus Insignis

Datasheet

General Description

The Eirmotus Insignis, formerly monotypic until 2008, is a small cyprinid with four species, closely resembling one another. E. insignis can be distinguished by unique black markings on the dorsal fin, specific body bar patterns, and sensory papillae. The species is characterized by its small size, distinctive coloration with red to yellow background and eight dark bars, and lack of barbels. Typically, they are less than 36mm in standard length and have a partial lateral line with few perforated scales.

Aquarium Setup

To create an ideal habitat for Eirmotus Insignis, a heavily planted tank or forest stream-type setup is recommended. This includes a soft substrate, subdued lighting, and natural décor like roots, branches, and leaf litter. Aquatic plants such as Microsorum, Taxiphyllum, or Cryptocoryne species can be added. Filtration need not be strong as these fish prefer sluggish waters. Acclimating Eirmotus species to captivity can be challenging due to their initial delicate state and sensitivity to water parameter fluctuations.

Behaviour

Known for being a shoaling species by nature, E. Insignis thrives when kept in groups of at least 8-10 individuals. Maintaining them in larger numbers reduces stress and creates a more natural environment. Male E. Insignis exhibit vibrant colors and engaging behaviors when vying for female attention. The species can be shy and may not compete well for food in aggressive community tanks, making them best suited for peaceful setups with small cyprinids.

Feeding and Diet

In the wild, E. Insignis likely feeds on small invertebrates, algae, and zooplankton. In captivity, they accept dried foods but should have a varied diet to thrive. Regular meals of small live and frozen foods like Daphnia and Artemia enhance coloration and encourage breeding conditions. Newly imported individuals may require live foods initially before transitioning to dry and frozen options. Ensuring a balanced diet is essential for their overall health.

Reproduction & Dimorphism

Details about E. Insignis reproduction in captivity are unrecorded. However, sexually mature females are expected to have a rounder body shape compared to males. Males may exhibit more intense coloration and engaging behaviors during courtship and breeding periods.

Habitat and Distribution

Eirmotus Insignis is native to the Kapuas river basin in Kalimantan Barat, Borneo, and Belitung Island near Sumatra's coast. They inhabit slow-moving, shallow rainforest streams with dense vegetation, muddy substrates, and dimly lit conditions due to canopy cover. These environments offer soft, acidic water and shelter among tree roots and aquatic plants for the species' survival.