Macneill's Basslet

Assessor macneilli

(0 Reviews)

Macneill's Basslet

Macneill's Basslet

Assessor macneilli

(0 Reviews)

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Macneill's Basslet Care Facts

Care Level: Moderate
Temperament: Semi-Aggressive
Diet: Carnivore
Reef Safe: Yes
Minimum Tank Size: 30 gallons
Max Size: 3 inches
The Macneill's Basslet, Assessor macneilli, features a deep navy blue coloration with its fins lined with a lighter, more electric, blue. Like other Basslets they should not be housed with another Basslets to avoid aggression, but can be kept safely and peacefully in a reef tank with other tank mates. 

Corals and larger invertebrates like shrimp are safe from this Basslet, though they will consume very small invertebrates such as amphipods , isopods and copepods. Diet should include a variety of live or frozen mysis shrimp and vitamin enriched brine shrimp 1-2 times daily.


Learn About the Macneill's Basslet at


The Macneill's Basslet, scientifically known as Assessor macneilli, is a remarkable addition to any saltwater marine aquarium. This species has become a favorite among marine enthusiasts with its vibrant coloration and intriguing behavior. This comprehensive guide will delve into every aspect of keeping the Macneill's Basslet in your home aquarium, offering valuable insights and practical information.


Habitat of Macneill's Basslet: A Taste of the Indian Ocean


The Macneill's Basslet hails from the tropical waters of the Indian Ocean, specifically the Western Indian Ocean. They often inhabit rocky crevices and coral reefs, making them well-suited for reef aquariums.


Reef Compatibility of Macneill's Basslet: Harmony in Your Reef


The Macneill's Basslet is generally considered reef-safe, making it an excellent choice for reef aquariums. This species is unlikely to harm coral or other reef inhabitants.


Size and Lifespan of Macneill's Basslet: Small Wonders


These basslets are relatively small, typically reaching around 2 to 2.5 inches (5 to 6.4 cm) when fully grown. With proper care, they can live up to 5 years in captivity.


Diet of Macneill's Basslet in Captivity: Omnivorous Delights


Macneill's Basslets are omnivorous, primarily feeding on zooplankton and small invertebrates in the wild. In captivity, they can be fed a varied diet of high-quality frozen and dry foods. Offer them a mix of brine shrimp, mysis shrimp, and high-quality pellets to ensure their nutritional needs are met.


Aquaculture and Availability of Macneill's Basslet: A Dash of Rarity


Macneill's Basslets are occasionally available through aquaculture and were obtainable from reputable marine fish retailers like However, availability can vary, so checking with your local fish store or trusted online vendors for current availability is advisable.


Compatibility of Macneill's Basslet with Other Fish and Invertebrates: Peaceful Coexistence


Macneill's Basslets are generally peaceful fish but can be territorial towards their own kind. It's recommended to keep them singly or in small groups (if the tank size allows). They are generally compatible with other peaceful fish species and most reef-safe invertebrates.


Sexual Dimorphism of Macneill's Basslet: Mysterious Beauties


Macneill's Basslets do not exhibit significant sexual dimorphism, meaning it's challenging to distinguish between males and females without close examination.


Juvenile to Adult Coloration Changes in Macneill's Basslet: A Colorful Evolution


Juvenile Macneill's Basslets have a predominantly yellow body with a distinctive black spot on their dorsal fin. Their coloration becomes more vibrant as they mature, with a striking blue and yellow pattern covering their body. Their dorsal fin spot may also change in intensity.


Temperament of Macneill's Basslet: Peaceful Presence


Macneill's Basslets are known for their peaceful disposition, making them a great addition to community reef tanks. They are generally shy and prefer to hide in rockwork or crevices when threatened.


Tank Requirements of Macneill's Basslet: Creating the Ideal Habitat


To ensure the well-being of your Macneill's Basslet, adhere to the following tank requirements:

  • Minimum Aquarium Size: A tank with at least 30 gallons capacity is suitable for a single Macneill's Basslet. For multiple individuals, consider a larger tank with ample hiding spaces.
  • Water Conditions:    
    • pH: Maintain a stable pH level between 8.1 and 8.4.
    • Salinity: Keep the salinity level within the range of 1.023 to 1.025.
    • Water Temperature: Maintain a temperature of 74°F to 78°F (23°C to 26°C).
    • Water Flow: Provide moderate water flow to mimic their natural habitat but avoid strong currents.

Common Names for Macneill's Basslet: A Variety of Monikers


Macneill's Basslet is sometimes referred to as the "Macneill's Assessor," "Yellowtail Assessor," or simply "Basslet."


Five Compatible Tank Mates for Macneill's Basslet: Choosing Friends Wisely

  • Royal Gramma (Gramma loreto): These small, colorful fish are peaceful and coexist well with Macneill's Basslets.
  • Firefish Goby (Nemateleotris magnifica): Their striking appearance and peaceful nature make them excellent tank mates.
  • Clownfish (Amphiprioninae): Clownfish are known for their symbiotic relationships with anemones and can peacefully share a tank with Macneill's Basslets.
  • Cleaner Shrimp (Lysmata amboinensis): These helpful crustaceans not only add diversity to your tank but also assist in maintaining a clean and healthy environment.
  • Peppermint Shrimp (Lysmata wurdemanni): They are known for their ability to help control unwanted Aiptasia anemones in the aquarium.

Why Choose for Macneill's Basslets: Trust in Excellence is a reputable and trusted source for marine fish and invertebrates. When you purchase Macneill's Basslets from, you can expect:

  • Healthy and well-cared-for fish.
  • A wide selection of marine species, including rare and exotic specimens.
  • Expert advice and guidance on proper care and compatibility.
  • Shipping options to ensure the safe delivery of your new additions.

In conclusion, Macneill's Basslet is a captivating and reef-safe species that can thrive in your saltwater marine aquarium. With proper care and attention to their specific requirements, these fish will reward you with their stunning colors and peaceful presence. Whether you're a seasoned aquarist or a beginner, the Macneill's Basslet is an excellent choice for enhancing the beauty of your aquatic world.

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