Species Summary Project
Nile Perch (Lates niloticus)
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Facts | Establishment
Common Name: Nile
Scientific Name: Lates niloticus
Phylum or Division: Chordata
The Nile perch is a fresh water fish that generally
grows between 85 and 100 centimeters and weighs between 2 and 4
kilograms. However, this predator has
been captured and seen at a size of 195 centimeters and is able to reach a
weight of 200 kilograms. It is one of
the most immense fresh water fish, and can live for up to 16 years.
Adult Nile perch can be distinguished by their silver
coloring and blue tint. They have
sharp black eyes which are surrounded by a luminous yellow outer ring. The juvenile Nile perch can be seen with very dark markings
beaming from their eyes with extensive dark markings on their body which in
time will fade with age.
The female Nile perch generally grows larger than the
male. Certain bones such as the preopercle and pre- orbital are guarded with spines. The Nile perch is known to grow extremely fast
during the first year of existence.
The growth rate begins to decrease throughout the next four years of
Original Distribution: The Nile perch is indigenous to the Ethiopian
region of Africa.
Distribution: They can
most commonly be found in Lake Victoria, which is in East
Africa. The Nile perch can also be found in other African
river basins in Chad, Senegal, Congo and Volta.
They can also be found in the Nile (hence the name) and Lake Maryut in Egypt.
The Nile perch can be
found in numerous types of fresh water.
Adult Nile perch inhabit lakes and rivers 10-60
meters in depths where there is a sufficient amount of oxygen. Small juveniles are confined to much more
shallow areas in rivers and lakes that are closer to shore.
Site and Date of Introduction: The Nile perch was initially introduced into Lake Victoria in 1962.
Subsequently, the decision to introduce the Nile perch into Australian waters was changed
when its catastrophic effect on African waters was noted.
Introduction: The Nile perch was intentially
introduced into Lake
commercial fishing purposes, where it then reproduced enormously and spread
throughout several aquatic environments in Africa.
Its popularity as a source of
food is its great abundance. The Nile perch is an easy fish to catch, when using
industrial fishing techniques. Their
considerable size and palatable bone free meat make them an attractive food
Reason(s) Why it has Become Established: The Nile perch is a dominating predatory fish. They are able to inhabit both fresh and
tropical water. They become sexually mature
at the age of three years and reproduce in large numbers (they can produce 16
million eggs at one time) with juveniles requiring no parental care.
Role: The Nile perch is a fierce predator that has had a
devastating impact in its initial and introduced habitats. They feed on their own species as well as
others, including crustaceans, mollusks and insects.
As the fish matures its
appetite increases. This ravenous
creature now searches for larger fish than the usual minute supply. This ability to prey on different size fish
enables it to dominate many habitats and have a catastrophic effect on the
many species it encounters as it moves from area to area in search of food.
introduction of the Nile perch has had a significant effect on the
fishing industry. Not only has this
species produced an increase in complete fishery, it has also helped increase
employment with fishery- related jobs as well. Large factory fishing corporations have
prospered greatly due to the development of the Nile perch.
The introduction of the Nile perch into Lake Victoria has had a catastrophic effect on the
ecosystem. Hundreds of fish native to
the lake have become extinct, by the 1980’s, 300 of these fish were
The Nile perch also carries numerous parasites in
its gills and different areas of its body, which can lead to the spread of
disease among other species resulting in the loss of biodiversity.
In addition to the degradation
that is caused by the Nile perch through competition, predation and
parasites, is the increase in deforestation in the region, due to the large
quantities of firewood that are required to dry the fish.
Level Diagnosis: Due to
their rapid reproduction and dominating force in their habitats I strongly
rank this threat as highest priority.
According to the IUCN’s Invasive
Species Specialist group the Nile Perch is considered one of the
world’s worst 100 invasive species.
If dramatic measures are not taken to eliminate this species, they
will continue to cause ecological disaster.
Control Method: Commercial fishing activities are
currently the only control method for the Nile perch in Lake Victoria.
Recently their have been signs of over fishing. Over the past twenty years, the quantity of
the Nile perch caught in Lake Victoria as a percentage of total fish caught have
slowly been declining. The average
size of the Nile perch has also declined over this
period. In addition, several species
of fish that were decimated by the introduction of the Nile perch into Lake Victoria are showing increasing populations.
Author: Jennifer Blake
Last Edited: January
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