Arulius Barb - (No Online Purchases)

The Arulius Barb is an active, eye-catching freshwater fish prized for its metallic sheen, bold markings, and flowing dorsal fins in mature males. Native to southern India, this species does best in groups and makes an excellent choice for larger community aquariums with plenty of swimming space.

Quick Facts

• Scientific name: Dawkinsia arulius
• Common names: Arulius Barb, Longfin Barb
• Adult size: 10–12 cm
• Lifespan: 5–8 years
• Temperament: Active, semi-peaceful
• Care level: Moderate
• Minimum tank size: 180–220 litres for a proper group
• Preferred temperature: 22–26°C
• pH range: 6.0–7.5
• Diet: Omnivore

Behaviour and Compatibility

Arulius Barbs are schooling fish and should be kept in groups of at least 6, though larger groups are strongly recommended. Keeping them in proper numbers helps reduce fin-nipping and aggressive behaviour.

They are best suited to aquariums with:

• Other active community fish
• Larger tetras, rainbowfish, danios, and peaceful barbs
• Plenty of open swimming room

Avoid housing them with:

• Very small fish
• Slow-moving or long-finned species such as fancy guppies or bettas

Aquarium Setup

Arulius Barbs appreciate a well-filtered aquarium with moderate water movement and stable water quality.

Recommended setup:

• Long tank with open swimming areas
• Driftwood and hardy plants
• Dark substrate to enhance colours
• Secure lid, as they can jump

Regular water changes are important to keep them healthy and displaying their best colouration.

Feeding

These fish are omnivorous and thrive on a varied diet.

Suitable foods include:

• Quality tropical flakes or pellets
• Frozen bloodworms and brine shrimp
• Live foods
• Vegetable matter such as spirulina flakes or blanched spinach

A varied diet helps maintain strong colour and overall health.

Appearance

Juveniles are fairly plain, but adults develop stunning blue-green highlights and dark body markings. Mature males often develop extended dorsal fin rays, giving them a graceful, flowing appearance.

Breeding

Arulius Barbs are egg scatterers and may breed in a mature aquarium. A separate breeding setup is usually recommended if raising fry is the goal, as adults may eat the eggs.

Good to Know

• Best colours develop in larger groups
• Active swimmers that need space
• Uncommon in the aquarium trade compared with other barb species
• Can become boisterous if overcrowded or kept in small groups

Arulius Barbs are a rewarding species for aquarists looking for an energetic and unusual schooling fish with plenty of personality.