Nile tilapia

Adventure step • Meet the species

Overview

The Nile tilapia is a medium-sized freshwater fish originally native to Africa, particularly the Nile River basin and other major lake systems. This robust and adaptable fish has become one of the world's most important aquaculture species and is now farmed in over 100 countries. The Nile tilapia has an oval, laterally compressed body with characteristic vertical stripes along its sides and can vary in color from silver-gray to golden-brown hues, depending on age and environment. The fish is known for its rapid growth and ability to survive in varying water quality and temperature conditions. It can grow up to 60 centimeters long and weigh over 4 kilograms, although most farmed specimens are harvested at weights between 500 grams and 1 kilogram. Nile tilapia has a characteristically large mouth and strong jaws used to gather both plant material and small animals. The body is covered with large, cycloid scales that give the fish a silvery, shimmering appearance. Nile tilapia is an omnivore that primarily feeds on algae, aquatic plants, insect larvae, and plankton. In nature, it plays an important role in the ecosystem by controlling algae growth and recycling nutrients. The fish thrives best in warm water between 20-30°C and is sensitive to temperatures below 10°C. It is also tolerant of varying oxygen levels and can survive in water of lower quality than many other fish species. This species has both positive and negative aspects from an environmental perspective. As a farmed fish, it is highly efficient and requires fewer resources than many other protein sources, making it important for global food security. However, in areas where it has been introduced outside its natural range, Nile tilapia can become invasive and outcompete native fish species. In Sweden and other Nordic countries, it occurs only in controlled farming facilities and aquariums.