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Nile perch were introduced to Lake Victoria in the 1950s to boost the fishing industry. The introduction caused an economic boom, but also drove hundreds of species of native cichlids to near-extinction.
 
Watch this video, from the Nat Geo WILD series “Destination Wild,” to discover the role an invasive species can play in an ecosystem and social system.
 
Instructional Ideas
 
Watch the video and use our glossary to explore the discussion questions in the Questions tab. Learn more about Nile perch with our Fast Facts, and dig deeper with links to related resources. This media spotlight aligns to Next Generation Science Standards in middle school and high school life science:
  1. Why do you think Lake Victoria’s cichlids are vulnerable to predation from the Nile perch?

  2. Why were Nile perch introduced to Lake Victoria?

  3. Was the introduction of the Nile perch economically successful?

  4. According to the video, the population of Nile perch has declined. Why do you think this has happened?

  5. Lake Victoria’s Nile perch fishery is an “environmental catastrophe” and shrinking support for the local economy. How can local and global partners address the environmental and economic issues created by the invasive species?

The wild fishery for Nile perch as been steadily decreasing since 2005. However, fishermen and women still catch more Nile perch than are harvested through aquaculture. In 2012, fishers harvested 278,675 tons of Nile perch, while 15,996 tons were harvested through “fish farms.”

Nile perch are carnivores. As fry (juvenile fish) they consume zooplankton, shrimp, clams, snails, and insects. As adults, they prey mostly on other fish. Nile perch can sometimes be cannibals—eating members of their own species.

Female Nile perch are generally larger than males.

Nile perch are some of the biggest freshwater fish in the world. Only these fish are consistently larger:
• taimen (indigenous to rivers of Mongolia and Russia)
• bull sharks (indigenous to coastlines throughout the tropics and subtropics)
• arapaima (indigenous to the Amazon River)
• alligator gar (indigenous to the southeastern United States)
• Mekong giant catfish (indigenous to the Mekong River in Southeast Asia)
• giant freshwater stingray (indigenous to Southeast Asia)
• white sturgeon (indigenous to North America)
• beluga sturgeon (indigenous to the Caspian, Black, and Adriatic Seas)
The Nile perch is known by many names (language in parentheses):
• dzo (Adangme)
• am’kal (Arabic)
• cal (Dinka)
• leshie  (Ewe)
• giwan ruwa (Hausa)
• saalen (Jula)
• mputa (Luo)
• sangala (Swahili)
• igbo (Yoruba)
• iji (Turkana)
 

Although Nile perch are not indigenous to Lake Victoria, they are native to other African lakes, including Lake Albert and Lake Turkana.

aquaculture
Noun

the art and science of cultivating marine or freshwater life for food and industry.

cannibal
Noun

organism that eats the meat of members of its own species.

Noun

organism that eats meat.

economic
Adjective

having to do with money.

Noun

community and interactions of living and nonliving things in an area.

Noun

process of complete disappearance of a species from Earth.

fish
Verb

to catch or harvest fish.

fishery
Noun

industry or occupation of harvesting fish, either in the wild or through aquaculture.

freshwater
Adjective

having to do with a habitat or ecosystem of a lake, river, or spring.

fry
Plural Noun

recently hatched fish that has reached the stage where its yolk-sac has almost disappeared and it can largely feed for itself.

harvest
Noun

the gathering and collection of crops, including both plants and animals.

Adjective

characteristic to or of a specific place.

industry
Noun

activity that produces goods and services.

introduced species
Noun

a species that does not naturally occur in an area. Also called alien, exotic, or non-native species.

Noun

type of plant or animal that is not indigenous to a particular area and causes economic or environmental harm.

zooplankton
Plural Noun

microscopic, heterotrophic organism that lives in the ocean.