Mertensii Butterfly - South Pacific

Chaetodon mertensii

(0 Reviews)

Mertensii Butterfly - South Pacific

Mertensii Butterfly - South Pacific

Chaetodon mertensii

(0 Reviews)

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Mertensii Butterfly - South Pacific Care Facts

Care Level: Moderate
Temperament: Peaceful
Diet: Omnivore
Reef Safe: No
Minimum Tank Size: 120 gallons
Max Size: 6 inches

The Mertensii Butterfly (Chaetodon mertensii), also known as the Crowned Pearlyscale Butterfly, is a beautiful fish found among the reefs of the Indo-Pacific Ocean. They have a light silver body with vertical black stripes, a yellow posterior and yellow tips along their dorsal fin. They may be kept with other butterflies, though they may fight with others of their kind. They are not recommended for reef aquariums, as they may nip at soft corals and polyps. Their diet should consist of occasional seaweed, crustaceans and other vitamin-enriched preparations. They reach a maximum size of 6 inches and should not be kept with overly aggressive fish.

Mertensii Butterflyfish (Chaetodon mertensii) for Saltwater Aquariums

The Mertensii Butterflyfish, scientifically known as Chaetodon mertensii, is a captivating marine species that aquarium enthusiasts often choose to adorn their saltwater setups. This detailed guide provides essential insights into the care and maintenance of the Mertensii Butterflyfish, ensuring a rewarding experience for both novice and seasoned hobbyists.


Habitat of the Mertensii Butterflyfish


Originating from the Indo-Pacific region, the Mertensii Butterflyfish inhabits coral-rich environments, including lagoons and outer reef slopes. Its natural habitat comprises a diverse range of corals, offering enthusiasts a glimpse into the intricate ecosystems found in the wild.


Reef Compatibility with Mertensii Butterflyfish


Considered not reef-safe, the Mertensii Butterflyfish can coexist with corals in a well-maintained aquarium. However, like many butterflyfish, it may nip at coral polyps, particularly those of the SPS (small-polyp stony) variety. Careful observation during the introduction phase is recommended.


Size, Lifespan, and Care of Mertensii Butterflyfish


In captivity, Mertensii Butterflyfish typically reaches a size of 6 to 8 inches (15 to 20 centimeters). With proper care, they boast a lifespan of 5 to 7 years, making them a long-term commitment for dedicated marine enthusiasts.


Dietary Preferences in Captivity


Maintaining the health of Mertensii Butterflyfish requires a balanced diet. They are predominantly carnivorous, thriving on a combination of high-quality marine flakes, pellets, frozen foods, and live offerings such as brine shrimp and mysis shrimp. Ensuring a diverse diet contributes to their overall well-being.


Aquaculture Availability for Mertensii Butterflyfish


Mertensii Butterflyfish are primarily sourced from the wild, with limited availability through aquaculture. Prospective hobbyists are encouraged to check with reputable suppliers for the latest information on the availability of aquacultured specimens.


Compatibility with Other Fish and Invertebrates


Known for their relatively peaceful nature, Mertensii Butterflyfish can share an aquarium with various tankmates. Compatible species include:

  • Banggai Cardinalfish (Pterapogon kauderni): Peaceful and visually striking, Banggai Cardinalfish make suitable companions.
  • Firefish Goby (Nemateleotris magnifica): A small, peaceful goby that complements the butterflyfish's temperament.
  • Royal Gramma (Gramma loreto): Known for their calm disposition, Royal Grammas are compatible tankmates.
  • Clownfish (Amphiprioninae): Various clownfish species, recognized for their adaptability, can cohabitate with Mertensii Butterflyfish.
  • Cleaner Shrimp (Lysmata amboinensis): These invertebrates contribute to the aquarium's ecosystem by providing cleaning services and are generally compatible with Mertensii Butterflyfish.

Sexual Dimorphism and Coloration Changes


Mertensii Butterflyfish do not exhibit significant sexual dimorphism, making it challenging to distinguish males from females based on physical characteristics alone. Juvenile Mertensii Butterflyfish showcase a vibrant yellow body adorned with striking blue vertical stripes. As they mature into adults, their coloration may deepen, and additional markings may develop, creating a visually appealing display in a well-lit aquarium.


Temperament of Mertensii Butterflyfish


Known for their calm demeanor, Mertensii Butterflyfish are generally suitable for community aquariums. However, individual temperaments can vary, necessitating careful observation during the initial introduction period.


Tank Requirements for Mertensii Butterflyfish


To provide an optimal environment for Mertensii Butterflyfish, consider the following tank requirements:

  • Minimum Aquarium Size: A tank with a capacity of at least 120 gallons is recommended to accommodate their size and allow for ample swimming space.
  • Water Conditions:
    • pH: Maintain a stable pH level between 8.1 and 8.4.
    • Salinity: Keep the salinity in the range of 1.020 to 1.025.
    • Water Temperature: Maintain the water temperature within the range of 74-80°F (23-27°C).
    • Water Flow: Moderate water flow is suitable, mimicking their natural reef habitat.

Common Names for Mertensii Butterflyfish


The Mertensii Butterflyfish is also known as the Blue-cheek Butterflyfish.


Why Choose for Mertensii Butterflyfish


Consider as your trusted source for acquiring Mertensii Butterflyfish for your marine aquarium. Here's why:

  • Wide Selection: offers a diverse range of marine fish, including the Mertensii Butterflyfish, ensuring you find the perfect addition for your aquarium.
  • Quality Assurance: The platform prioritizes sourcing healthy and vibrant specimens, providing your new aquatic companion with the best start.
  • Expertise: With years of experience in the marine aquarium industry, can offer valuable advice and support, contributing to your success as a marine hobbyist.
  • Convenience: Ordering from provides a convenient way to access a variety of marine species, with shipping options available to deliver your fish safely to your door.

In conclusion, the Mertensii Butterflyfish, with its striking appearance and peaceful nature, is a valuable asset to a saltwater aquarium. By adhering to proper care practices and providing a suitable environment, you can enjoy the beauty of this species while contributing to the diversity of your marine ecosystem. Consider as your go-to platform for acquiring a Mertensii Butterflyfish, enhancing your marine aquarium experience.

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