Freshwater Frogfish (Antennarius biocellatus) 1.005 SG Brackish for Sale in Canada

The Freshwater Frogfish (Antennarius biocellatus) is an extremely rare and unusual ambush predator known for its extraordinary camouflage, unusual walking-like movement, and fascinating hunting behaviour. Despite the common name used in the aquarium trade, this species is a frogfish and requires specialist care.

This listing is for a specimen currently maintained in brackish water at a specific gravity of 1.005 SG. Maintaining the fish in its established salinity conditions is extremely important. Sudden changes in salinity can cause severe stress, so any transition should only be considered gradually and with expert knowledge.

With its leaf-like appearance and remarkable ability to blend into its surroundings, the Freshwater Frogfish is one of the most unique predatory fish available to specialist aquarists. It may remain almost completely motionless for long periods before making an incredibly fast strike at suitable prey.

Monster Aquarium Canada offers this exceptional Freshwater Frogfish (Antennarius biocellatus) maintained at 1.005 SG brackish water for experienced aquarium hobbyists across Canada.

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Why Choose a Freshwater Frogfish?

One of the Most Unusual Ambush Predators

The Freshwater Frogfish is admired for its:

Unique Features

Premium Characteristics

• Extremely rare and unusual aquarium fish
• Exceptional natural camouflage
• Fascinating ambush-predator behaviour
• Can remain motionless for extended periods
• Lightning-fast feeding strikes
• Distinctive limb-like pectoral fins
• Unusual walking or climbing movement
• Incredible centerpiece fish for a specialist aquarium

Individual colour and appearance can vary, and the fish may change its appearance over time depending on its environment and condition.

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Current Water Condition: 1.005 SG Brackish

Important Specialist Care Information

This specimen is currently maintained at 1.005 specific gravity (SG).

The receiving aquarium should be properly prepared before the fish arrives.

Important Requirements

• Confirm salinity with a reliable refractometer or hydrometer
• Prepare the aquarium before introducing the fish
• Match transport and holding conditions carefully
• Avoid sudden salinity changes
• Acclimate gradually
• Maintain stable temperature and water quality

Do not assume that ordinary freshwater conditions are appropriate for this specimen. Its established care conditions should be maintained unless an experienced keeper has a carefully researched reason to make a gradual adjustment.

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How Large Does Antennarius biocellatus Get?

This frogfish can reach approximately 4–5 inches (10–13 cm), although adult size can vary depending on individual genetics and long-term conditions.

Despite its relatively compact size, it is a serious predator capable of consuming surprisingly large prey.

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Aquarium Size

A 30-gallon aquarium or larger is recommended for a single specimen, with larger systems preferred for long-term stability and easier water management.

Aquarium floor space, stable conditions, and carefully arranged décor are more important than creating a large open swimming environment.

Recommended Aquarium Setup

• Mature biological filtration
• Stable brackish water at the established salinity
• Reliable salinity monitoring
• Moderate water movement
• Natural-looking décor
• Driftwood and roots where appropriate
• Smooth rocks
• Sheltered areas
• Low to moderate lighting
• Secure aquarium lid

Avoid sharp decorations that could injure the fish.

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Water Parameters

• Scientific Name: Antennarius biocellatus
• Common Name: Freshwater Frogfish
• Current Water Condition: Brackish, 1.005 SG
• Potential Adult Size: Approximately 4–5 inches (10–13 cm)
• Care Level: Expert
• Temperament: Highly predatory
• Diet: Carnivorous
• Swimming Level: Bottom and lower levels
• Behaviour: Ambush predator

Temperature and Water Stability

Maintain stable tropical conditions appropriate to the specimen’s established environment. Before purchase, ensure the receiving aquarium can match the fish’s current temperature and salinity.

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Feeding Your Freshwater Frogfish

A Specialized Ambush Predator

Freshwater Frogfish are carnivorous and require appropriately sized aquatic foods.

Their feeding behaviour is remarkable: they may remain still and wait for prey before striking with incredible speed.

Suitable Foods

Depending on the individual fish and its established feeding response, suitable foods may include:

• Marine-origin shrimp
• Small appropriately sized aquatic foods
• Pieces of suitable fish or crustacean
• Other nutritionally appropriate aquatic protein foods

Important Feeding Advice

Avoid relying on live feeder fish as a staple diet. Live feeders can introduce parasites and disease and may not provide balanced nutrition.

Because frogfish can consume relatively large prey, avoid overfeeding.

Allow appropriate time between meals and monitor body condition carefully.

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Behaviour and Temperament

Patient, Motionless and Extremely Fast

The Freshwater Frogfish is a classic ambush predator.

It may:

• Remain motionless for long periods
• Blend into driftwood or décor
• Slowly reposition itself using its fins
• Wait for suitable prey
• Strike with extraordinary speed
• Attempt to consume fish that appear too large at first glance

Its calm appearance should never be mistaken for harmless behaviour.

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Tank Mates

Species-Only Housing Is Strongly Recommended

Because this is a highly specialized ambush predator, a species-focused aquarium is generally the safest choice.

Potential tank mates present serious risks because they may:

• Be swallowed
• Injure the frogfish
• Outcompete it for food
• Require incompatible water conditions

Avoid

• Small fish
• Small crustaceans
• Fast feeders
• Aggressive fish
• Fin-nipping species
• Fish that can fit in the frogfish’s mouth

Remember: a frogfish may attempt to eat prey nearly as large as itself.

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Creating the Ideal 1.005 SG Brackish Aquarium

Focus on Stability and Security

This specialist aquarium should be mature and fully prepared before introducing the fish.

Recommended Features

• Stable 1.005 SG salinity
• Reliable salinity testing
• Mature filtration
• Excellent water quality
• Natural camouflage opportunities
• Smooth décor
• Sheltered resting areas
• Moderate lighting
• Low-stress surroundings

Avoid making frequent changes to salinity or water chemistry.

Consistency is essential.

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Why Buy Freshwater Frogfish from Monster Aquarium Canada?

Rare Specialist Fish for Experienced Canadian Aquarists

Monster Aquarium Canada offers unusual freshwater and specialist aquarium fish for hobbyists interested in rare species, predator fish, monster fish, and exceptional aquatic animals.

An Extremely Unique Aquarium Specimen

This Freshwater Frogfish offers an opportunity to own a genuinely unusual ambush predator with some of the most remarkable camouflage and feeding behaviour found in aquarium fish.

Canadian Aquarium Fish Supplier

Monster Aquarium Canada specializes in rare tropical fish, freshwater fish, monster fish, specialist aquarium species, aquarium plants, shrimp, crayfish, snails, fish foods, medications, and aquarium supplies for Canadian aquarium hobbyists.

Important: This is an expert-level species. Before ordering, ensure your aquarium is fully cycled and capable of maintaining the fish’s current 1.005 SG brackish conditions. Confirm all applicable Canadian federal, provincial, territorial, and local requirements before purchase.

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Frequently Asked Questions

1. What does 1.005 SG mean?

SG means specific gravity, a measurement used to determine water density and salinity. This specimen is currently maintained in low-salinity brackish water at 1.005 SG.

2. Is this frogfish suitable for a freshwater aquarium?

Not under the conditions listed. This specimen is currently maintained at 1.005 SG brackish water, and sudden changes to freshwater could cause serious stress.

3. How large does Antennarius biocellatus grow?

It can reach approximately 4–5 inches (10–13 cm), although individual growth can vary.

4. What does a Freshwater Frogfish eat?

It is carnivorous and requires appropriately sized aquatic protein foods. The exact diet should be based on the individual fish’s established feeding response.

5. Can a Freshwater Frogfish live with other fish?

Species-only housing is generally recommended because the frogfish is a highly specialized predator and may swallow suitably sized tank mates.