Redfin Bala Shark: A Comprehensive Guide (Cyclocheilichthys janthochir)

April 08, 2026

The Redfin Bala Shark (Cyclocheilichthys janthochir) is one of those fish that instantly makes you look twice—especially if you’re used to seeing the standard Bala Shark (Balantiocheilos melanopterus). At a glance, you get that same sleek, torpedo-shaped “shark” look, but then you notice the reddish fins and slightly different body profile, and it becomes clear this is something a bit more unique.

This is a large, fast-moving schooling barb, not a true shark, and definitely not a beginner fish. It’s built for space, flow, and constant movement, and when kept properly in a group, it has a really impressive presence.

It’s also a rarer import in the hobby, so if you come across them, it’s worth knowing what you’re getting into before bringing them home.

Natural Distribution & Habitat

Cyclocheilichthys janthochir is native to Southeast Asia, primarily:

Thailand
Malaysia
Parts of Indonesia

They’re typically found in:

Large rivers and tributaries
Floodplain systems
Open water environments

Natural conditions include:

Moderate to strong current
Warm, oxygen-rich water
Seasonal changes in water level

These are open-water river fish, not small stream or planted tank species.

Size

This is where things get serious.

Adult size: 10–14 inches

They grow large and stay active, which means tank size becomes a major factor.

Aquarium Care

This is not a casual community fish.

Tank size: 125 gallons minimum (bigger is strongly recommended)
Tank length is critical (they need swimming room)
Flow: Moderate
Aquascape: Open water with structure along edges
Substrate: Sand or smooth gravel

Key requirements:

👉 Lots of open swimming space
👉 Strong filtration
👉 Tight-fitting lid (they can jump)

They do best in setups that mimic large river environments.

Water Parameters

They’re fairly adaptable, but clean water is key.

Temperature: 75–82°F
pH: 6.0–7.5
Hardness: Soft to moderate

Because of their size and activity:

👉 Waste load is high
👉 Filtration and water changes matter a lot

Diet

They’re omnivores and not picky.

They’ll take:

Pellets
Flake
Frozen foods (bloodworms, brine shrimp)
Vegetable matter

They’re strong feeders and will eat aggressively in a group.

Behavior & Tank Mates

This is a schooling species, and that’s important.

They are:

Active
Peaceful (generally)
Fast swimmers

Best kept in:

Groups of 5–6+

Tank mates need to match their:

Size
Activity level

Good options:

Larger barbs
Rainbowfish
Larger peaceful cichlids
Other river species

Avoid:

Small fish (they may get stressed or eaten)
Slow or delicate species

They occupy mostly the midwater, constantly cruising.

Redfin Bala Shark vs. True Bala Shark

This is where a lot of confusion comes in.

Redfin Bala Shark (Cyclocheilichthys janthochir):

Reddish or orange-tinged fins
Slightly different body proportions
Less commonly seen in the hobby

True Bala Shark (Balantiocheilos melanopterus):

Black-edged fins
More commonly available
Different genus entirely

Despite the similar name and shape:

👉 They are not closely related “variants”
👉 Just similar-looking river fish from the same region

What They’re Actually Like in a Tank

These fish are all about:

Movement
Presence
Scale

They don’t “hang out”:

👉 They cruise
👉 Constantly

In a small tank, they’ll look stressed and cramped.

In a large tank:

👉 They look like they belong in a river system

Breeding

Breeding in home aquariums is essentially not documented.

In the wild:

Likely seasonal spawners
Influenced by flooding cycles

This is not a species typically bred in captivity.

Fun Facts & Hobby Notes

They’re often mistaken for Bala Sharks.
But they’re a completely different species.

They grow fast.
Small juveniles won’t stay small for long.

They need a group to feel secure.
Single fish will often be stressed.

They’re a “big tank or nothing” fish.

Why Aquarists Love Them

This is a niche fish—but for the right setup, it’s awesome.

Why they stand out:

Sleek, shark-like body
Red-accented fins
Constant movement
Strong schooling behavior
Rare in the hobby

If you’ve got the space and want something that brings big energy to a large tank, the Redfin Bala Shark is a seriously cool option.

Looking to Add Fish to Your Aquarium?

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