Mchenga

Mchenga

As an experienced aquarium owner, I am happy to help you with a detailed description of the Mchenga genus, a fascinating group of cichlids from Lake Malawi. These fish are known for their unique behavior and specific habitat.

Introduction to the Mchenga genus

The Mchenga genus comprises a group of cichlids that are endemic to Lake Malawi in East Africa. They belong to the so-called ‘Utaka’, a term often used for pelagic cichlids that live in open water and feed on plankton. The name Mchenga itself comes from Chichewa, the indigenous language of Malawi, and means “sand.” This name is very appropriate, as the fish mainly live above sandy bottoms and their breeding behavior is strongly linked to sand structures.

Discovery and Classification

The genus Mchenga was first scientifically described in 2006 by Jay Richard Stauffer and Adrianus F. Konings. Before being placed in this new genus, the species now classified as Mchenga belonged to the genus Copadichromis. The reclassification was based on clear morphological and behavioral characteristics that distinguish Mchenga from Copadichromis.

Characteristics that distinguish Mchenga

Mchenga species are relatively slender fish that can reach a length of 8 to 14 centimeters. They have a number of specific characteristics that distinguish them from other cichlids, particularly from the closely related genus Copadichromis:

1. Teeth: One of the most striking differences is the teeth. Adult male Mchenga have small, two-pointed teeth in the outer rows of both the upper and lower jaws. This contrasts with the larger, single-pointed teeth characteristic of male Copadichromis.
2. Mouth structure: Mchenga species have a strongly protractile (protraktile) mouth. When extended, the mouth forms a tubular structure, ideal for sucking up their main food source: planktonic crustaceans.
3. Gill rakers: The number of gill rakers on the first ceratobranchial (a bone in the gill arch) is relatively low, ranging from 10 to 18. This is another distinguishing feature compared to, for example, Copadichromis, which usually have more gill rakers (e.g., 24-28 in the C. quadrimaculatus group).
4. Body pigmentation: Mchenga species lack conspicuous spots or stripes on their bodies. This is an important difference from, for example, the genus Nyassachromis, which often exhibits a prominent mid-lateral band and sometimes additional horizontal elements in the dorso-lateral band.
5. Breeding behavior and sand castles: A diagnostic behavioral characteristic of Mchenga is the construction of sand castles (bowers) in shallow water, which do not contain rocks. The males begin building these sandcastles by adding sand from the surrounding bottom, rather than digging up sand, as some other cichlids do. These sandcastles play an important role in the mate recognition process and sexual selection within the genus.

Lifestyle and Habitat

Mchenga species typically live at depths of 3 to 25 meters above sandy bottoms in Lake Malawi. Their diet consists mainly of planktonic crustaceans, which they suck up with their specialized mouths. Like almost all cichlids from Lake Malawi, Mchenga species are mouthbrooders, with the females carrying the eggs and young fish in their mouths for protection.

Species within the genus Mchenga

Currently, six valid species have been described within the genus Mchenga. The length of these species varies from 8 to 14 cm. Two of these species, M. eucinostomus and M. inornata, are only known from their type specimens and their breeding biology in the wild is still unknown.

Here is an alphabetical list of the valid species:

• Mchenga conophoros
• Mchenga cyclicos
• Mchenga eucinostomus
• Mchenga flavimanus
• Mchenga inornata
• Mchenga thinos*

Aquarium care of Mchenga

Keeping Mchenga species in an aquarium requires attention to their natural habitat and behavior.

• Aquarium size: Given their length and active nature, as well as the breeding behavior of the males who build sand castles, a spacious aquarium is important. An aquarium of at least 400-500 liters is recommended for a small group, with a length of at least 150 centimeters.
• Decoration: The decoration should mimic the sandy bottoms of Lake Malawi. A thick layer of fine sand is important so that the males can build their sand castles. Although they do not use rocks in their castles in the wild, a few rock formations at the edges of the aquarium can provide hiding places and demarcate territories. Ensure there is sufficient open swimming space.
• Water quality: Malawi cichlids thrive in hard, alkaline water. The ideal water parameters are:
  – Temperature: 22-26 °C
  – pH value: 7.5-8.5
• Regular water changes are necessary to maintain high water quality and keep nitrate levels low.
• Feeding: As plankton feeders in the wild, Mchenga in the aquarium should be fed a diet rich in animal protein. High-quality cichlid food in flakes or granules, supplemented with frozen food such as artemia, mysis, and cyclops, is ideal. Feed small portions several times a day.
• Behavior and compatibility: Mchenga species are generally peaceful cichlids, but males can be territorial during the breeding season. It is advisable to keep them in a harem (one male with several females) to spread aggression. They can be kept with other peaceful Malawi cichlids of similar size and temperament, especially other Utaka species that also live in open water. Avoid combining them with highly aggressive Mbuna species.
  Breeding: Breeding in the aquarium is possible, provided the right conditions are provided. The males will build their sand castles to attract females. After mating, the female will take the eggs into her mouth and incubate them there. She will then retreat to a quiet spot in the aquarium.

By following these guidelines, you can create a successful and fascinating environment for these beautiful sand cichlids from Lake Malawi.