How to Identify Blue Mbuna

To identify Blue Mbuna (Metriaclima callainos), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Males typically display a vibrant, iridescent cobalt blue to powder blue coloration across their entire body, including fins. Some individuals may exhibit faint vertical barring, especially when stressed or during breeding displays. Females are generally less intensely colored, often a duller blue or grayish-blue, though some can be as brightly colored as males. There are also white and yellow morphs (e.g., 'White Cobalt' and 'Yellow Cobalt') which are color variations of this species, though the 'Blue Mbuna' specifically refers to the blue morph.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Robust, somewhat elongated body typical of Mbuna cichlids., Terminal mouth with bicuspid teeth adapted for scraping algae from rocks., Relatively large eyes., Males often develop nuchal humps (fatty deposits on the forehead) with age, especially dominant individuals.

Dorsal fin

Long, continuous dorsal fin with 16-19 spines and 8-11 soft rays. The spiny portion is typically longer than the soft-rayed portion.

Tail fin

Caudal fin is typically rounded to truncate.

Pectoral fin

Pectoral fins are relatively short and rounded.

Distinctive fins

Anal fin has 3-4 spines and 7-9 soft rays. Males often display prominent egg spots (ocelli) on the anal fin, which are used during spawning to entice females to pick up their eggs.

Identification Tips

1. 1

   Coloration

   Look for the characteristic vibrant cobalt to powder blue body color. While other Mbuna can be blue, the intensity and uniformity of the blue in Metriaclima callainos are often key.

2. 2

   Body Shape

   Observe the robust, somewhat compressed body typical of Mbuna. It is not as elongated as some other cichlids, nor as deep-bodied as others.

3. 3

   Mouth and Teeth

   If possible, note the terminal mouth with bicuspid teeth, adapted for scraping algae. This is a general Mbuna characteristic but helps distinguish them from piscivorous or invertebrate-feeding cichlids.

4. 4

   Egg Spots

   Males will typically have distinct, yellowish egg spots on their anal fin, which are a strong indicator of a male Mbuna cichlid.

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