Red Fin Black Shark: The Bold Beauty of Freshwater Aquariums

Introduction to the Red Fin Black Shark

The red fin black shark, also known by several variations like black red fin shark, red finned black shark, and even big red.fin.black.shark, is one of the most striking fish in the freshwater aquarium world. With its bold jet-black body and vibrant red tail fin, this fish is often mistaken for a miniature shark. Though not a true shark, its aggressive appearance, territorial behavior, and energetic nature make it a standout species in any tank.

In this comprehensive guide, we’ll explore its origins, care requirements, compatibility, diet, and everything you need to know before adding this magnificent fish to your aquarium.

Species Overview

Scientific Classification

• Scientific Name: Epalzeorhynchos bicolor

• Family: Cyprinidae (Carp family)

• Common Names: Red fin black shark, black red fin shark, red finned black shark, big red.fin.black.shark

This fish is a ray-finned freshwater species, popular in the aquarium trade due to its contrasting coloration and energetic swimming style.

Origin and Natural Habitat

Originally found in Thailand’s Chao Phraya River basin, the red fin black shark once thrived in clean, fast-flowing rivers with gravel substrates and dense vegetation. Unfortunately, it has been classified as critically endangered in the wild due to habitat loss and pollution. Today, most specimens in the aquarium trade are commercially bred in captivity.

Appearance and Characteristics

Bold Coloration

The red fin black shark has a deep black body with a bright crimson or orange-red tail fin. This contrast makes it one of the most photogenic freshwater fish available to hobbyists.

Size and Lifespan

• Average Size: 5 to 6 inches (12–15 cm)

• Maximum Size: Up to 7 inches (18 cm) in ideal conditions

• Lifespan: 5 to 8 years, with some living up to 10 years in optimal setups

Its shark-like body shape and active swimming style often confuse beginners into thinking it’s a saltwater or predatory species, which it is not.

Tank Requirements

Tank Size

Given its territorial nature and active swimming habits, the red fin black shark requires a minimum tank size of 40 to 50 gallons (150–200 liters). Larger tanks with plenty of swimming space and hiding spots are strongly recommended for adult specimens.

Water Parameters

Tank Setup

• Use dark substrates to enhance the fish’s colors.

• Decorate with rocks, driftwood, and dense plants to create hiding areas and break line of sight.

• Secure lids are essential as these fish are known jumpers.

• Ensure strong filtration and good oxygenation to mimic their natural habitat.

Behavior and Temperament

Aggression and Territory

The red fin black shark is semi-aggressive and highly territorial, especially toward fish that resemble its shape or coloration. It does not tolerate others of its kind unless kept in a very large tank (over 100 gallons) with plenty of cover.

Ideal Tankmates

While it may harass timid or slow-swimming fish, it can coexist with fast-moving, similarly sized species such as:

• Tiger barbs

• Danios

• Rainbowfish

• Certain tetras

• Gouramis (caution advised)

Avoid keeping it with other bottom dwellers like:

• Corydoras

• Loaches

• Other red finned black sharks

Aggression tends to increase with age and limited space.

Diet and Feeding

Omnivorous Diet

Red fin black sharks are omnivores and require a balanced diet that includes both plant-based and protein-rich foods.

Recommended Foods

• High-quality flakes and sinking pellets

• Blanched vegetables (zucchini, cucumber, spinach)

• Bloodworms

• Brine shrimp

• Algae wafers

Feed 2–3 times daily in small portions, and avoid overfeeding to maintain water quality.

Breeding Challenges

Breeding in Captivity

Breeding red fin black sharks at home is extremely rare. Commercial breeders use hormone treatments in controlled environments to encourage spawning. In home aquariums, they seldom show breeding behavior due to their territorial nature and need for specific water chemistry.

Common Health Issues

Though generally hardy, red fin black sharks can be vulnerable to common freshwater ailments if tank conditions are poor.

Common Diseases

• Ich (white spot disease)

• Fin rot

• Bacterial infections

• Fungal infections

Maintain excellent water quality, avoid overcrowding, and quarantine new tank mates to prevent disease.

Related Keywords Explained

Black Red Fin Shark

This alternate name emphasizes the visual contrast of the fish’s colors. It is commonly used interchangeably with the primary term, red fin black shark.

Red Finned Black Shark

A more descriptive variation, this term highlights the shark-like appearance and vivid red fin. It is widely used by aquarium retailers and forums.

Big Red.Fin.Black.Shark

This long-tail keyword is often searched by hobbyists looking for mature or large-sized specimens. It suggests interest in full-grown individuals with intense coloration and established behavior traits.

Conclusion: Is the Red Fin Black Shark Right for You?

The red fin black shark is a fantastic choice for intermediate to experienced aquarists who want a bold, eye-catching, and active fish in their freshwater setup. Its unique appearance and confident swimming style add life and energy to aquariums, but only when provided with proper care, space, and compatible tank mates.

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