Karonga tilapia
Endangered cichlid from Lake Malawi and the Shire River.
The Karonga tilapia is a cichlid fish native to Lake Malawi, Lake Malombe, and the Shire River. It supports local commercial fisheries but faces severe population declines due to overfishing. Breeding males display distinct black colouration with white fin edges.
- Grows up to 42 centimetres in length.
- Critically endangered due to overfishing.
- Males have egg-like genital tassels.
- Feeds mainly on phytoplankton and diatoms.
- Endemic to Lake Malawi and Shire River.
What it is
This cichlid belongs to the subgenus Nyasalapia, locally known as chambo. Adults can grow to a total length of 42 centimetres. Breeding males are black with white edges on their fins. They look very similar to breeding male O. lidole. Females are more yellowish-brown than those of O. lidole and O. squamipinnis. The species is part of the group often referred to as chambo in regional fisheries.
Where it lives
The fish is endemic to specific water bodies in southern Africa. Its range includes Lake Malawi and Lake Malombe. It also inhabits the upper and middle sections of the Shire River. These waters span across Malawi, Mozambique, and Tanzania. The species relies on these freshwater habitats for its entire life cycle.
How it lives
It feeds mainly on phytoplankton, with diatoms forming a key part of its diet. An aggressive mimic, the lepidophagous cichlid Corematodus shiranus, copies its colour and swimming style. This mimic approaches unsuspecting schools to snatch scales or fins. The Karonga tilapia does not appear to have other noted predators in the provided text, but it lives in schools that attract such mimics.
Breeding and life cycle
Breeding males develop long genital tassels that resemble fish eggs. During spawning, the female tries to pick up these tassels with her mouth. This action helps the male fertilize the eggs she already holds in her mouth. This mouthbrooding behaviour is typical for the group. Taxonomic reviews suggest O. saka may be a synonym, differing only in pharyngeal bones and teeth.
Fish and people
Local commercial fisheries depend on this species. It is an important food source for communities around Lake Malawi and the Shire River. However, heavy fishing pressure has caused drastic population declines. The fish is valued for its meat, but current harvest levels threaten its survival.
Status and threats
The species is listed as Critically Endangered. Overfishing is the primary cause of its drastic decline. While taxonomic debates continue regarding O. saka, both are currently considered valid by FishBase. Conservation efforts are needed to reverse the population drop in its native range across Malawi, Mozambique, and Tanzania.
Questions people ask about Karonga tilapia
What does the Karonga tilapia eat?
It mainly feeds on phytoplankton. Diatoms are a significant part of its diet. This plant-based feeding habit distinguishes it from predatory cichlids in the same waters.
Why is it called chambo?
Chambo is the local name for cichlids in the subgenus Nyasalapia. Oreochromis karongae is part of this group. The name is widely used in regional commercial fisheries.
How do they breed?
Males have genital tassels that look like eggs. Females try to pick them up, which helps fertilize the eggs in her mouth. She then carries the young until they hatch.
Is it safe from predators?
No. The cichlid Corematodus shiranus mimics its appearance and swimming. This allows the mimic to approach and bite off scales or fins from unsuspecting individuals.
Good reading and sources
- Oreochromis karongae on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Oreochromis karongae", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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