Redline
Devario assamensis
Also known as: Blood Stripe, Mirik Red
A rare, deep-bodied danionid from Assam with vivid lateral striping and restless energy.

About
Found in the river systems of Assam in northeastern India, Devario assamensis is a deep-bodied schooling fish that has only occasionally surfaced in the hobby, sometimes traded under informal names like 'Mirik red', 'redline', or 'blood stripe'. It belongs to a group of larger, robust danionids and carries a prominent dark lateral stripe, the so-called P stripe, that runs along the flank and extends into the fork of the tail, a pattern shared with a handful of close relatives from the same region. It's a fish that's always on the move. While not aggressive, it's boisterous enough at feeding time and active enough throughout the day that shy or slow-moving tankmates can end up stressed. Robust companions of similar size, other cyprinids, loaches, larger characins, are far better choices than anything timid or delicate. Like all schooling species in this group, it really does need numbers to settle in properly; a group of eight or more makes a noticeable difference to both the fish's confidence and the visual impact of the display. Males in particular tend to develop better color when kept alongside rivals. Breeding follows the typical egg-scattering pattern of the broader danionid family, and the species is generally considered a workable choice for beginners given some attention to tank size and compatible company.
Similar species
Other fish you might consider
Good tank mates
Species that tend to coexist peacefully with Redline
From the same region
Share the same natural habitat. Great for a biotope-themed tank
Frequently asked questions
- How big does the Redline get?
- The Redline reaches about 2–3.5" as an adult.
- What size tank does the Redline need?
- A minimum of 43 gallons is recommended for the Redline, with more room needed for a proper group.
- What water parameters does the Redline need?
- The Redline does best with a temperature of 68–82°F, a pH of 6–8, hardness around 2–12 dGH.
- Is the Redline aggressive?
- The Redline is generally peaceful and suits a community tank with similarly calm tankmates.