Max Size: 10cm

Blood Tailed Danio (Devario annandalei)

Blood Tailed Danios are active, reasonably hardy and friendly fish making them an excellent addition to a peaceful community aquarium, especially if you already keep larger species. However, these Danios are among the biggest Danios and require a large aquarium with plenty of swimming space. Nevertheless, these Danios can thrive in various temperatures and water parameters, so they are suitable for the beginner aquarist, providing they have a large enough aquarium.

Blood Tailed Danios are a shoaling species in nature; therefore, it would be better to maintain them in groups of six or more individuals. Suitable tankmates for these Danios could include medium to large-sized Danios, Barbs and Rasboras, as well as peaceful Cichlids, Catfish, and Loaches. However, it would be better to avoid smaller species as they may be seen as a snack or slow-moving species as they may feel nervous around these active fish.

The aquarium will need to be well oxygenated and have a reasonable flow rate as these fish will enjoy swimming against the current; therefore, adding a powerhead or an internal filter would be ideal. Since these Danios naturally occur in pristine habitats, they are intolerant to the buildup of excessive organic waste. Therefore these fish require good water conditions to thrive, and you should never introduce them into a biologically immature aquarium. In addition, the aquarium will need a tight-fitting lid as these Danios are accomplished jumpers.

Blood Tailed Danios have a metallic silvery-blue body colour with yellowish-orange lines and dots on the flanks starting from the gills and running through to the base of the caudal fin. In addition, these Danios also have blood-red and light blue colouration between the caudal fin rays. All the other fins on this fish are transparent.

Quick Facts
Scientific NameDevario annandalei
Year Described1908
Other NamesNone
OriginsChina, Thailand
Aquarium LevelMiddle
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan4 - 8 years
Water Parameters
Water TypeFreshwater
PH6.5 - 7.5
GH5 - 15
KH4 - 8
71 - 79℉
21.7 - 26.1℃

Photos of the Blood Tailed Danio

Blood Tailed Danio

Natural Habitat

Blood Tailed Danios are endemic to the Chao Phraya, Salween and Mekong River Basins in Thailand and China in Southeast Asia. These Danios inhabit fast-flowing waters through rugged mountain canyons as well as tropical and subtropical floodplain rivers and wetlands surrounded by forest.

What to feed the Blood Tailed Danio

Blood Tailed Danios are not fussy eaters in the aquarium. However, a good quality dried product should be used as the staple diet alongside frequent meals of frozen, live and freeze-dried foods such as cyclops, mosquito larvae, brine shrimp, daphnia and bloodworm. Providing your Danios with a varied diet will help your fish preserve their best colours and condition.

How to sex the Blood Tailed Danio

It can be quite challenging to differentiate between males and female Blood Tailed Danios. However, the females are typically larger, possess a more rounded abdomen, and are not as vibrantly coloured as the males. In contrast, males are slimmer and more brightly coloured than females.

How to breed the Blood Tailed Danio

Unfortunately, there is very little to no information on breeding Blood Tailed Danios. However, they will more than likely produce similarly to other Devario species.

You can condition your adult group together; however, you need to set up a separate breeding tank and half-fill it with mature water. It would be best to fill much of the available space with suitable spawning mediums such as java moss or spawning mops, or you can place mesh, pebbles or marbles on the base of the tank so the eggs can fall through and be hidden.

Their water will need to be somewhat acidic to neutral with a slightly higher temperature than average. You should also add an air stone or an air-powered sponge filter to provide water movement and oxygenation. Once you have conditioned the adult fish and the females seem to be full of eggs, you should introduce one or two pairs into the breeding tank. Feeding your Danios with small amounts of live and frozen food can activate spawning, and several spawning events will probably occur before a female has run out of eggs.

Spawning usually takes place within 24 hours, with the female being noticeably slimmer once all her eggs have been laid; then, after 48 hours, you should vacate the adults, so they do not consume the eggs.

The Incubation period can be temperature-dependent but typically takes between 24 and 36 hours for the fry to hatch. The fry will then become free-swimming a few days after that.

It would be best if you initially fed your fry on liquid fry food, Paramecium, or powdered food, moving on to newly hatched brine shrimp and microworms around a week or so later once they are big enough to accept them.

Other Danios of interest

Assam Danio(Devario assamensis)
Barred Danio(Devario pathirana)
Bengal Danio(Devario devario)
Black Barred Danio(Danio absconditus)
Blue Danio(Danio kerri)
Celestial Pearl Danio(Danio margaritatus)
View all Danios
Date Added: 02/03/2022 11:33:28 - Updated: 02/03/2022 13:23:30