Arapaima resurgence threatens Brazil's river ecosystems
The arapaima, once thought to be extinct, has reappeared in Brazilian rivers. Contrary to being good news, its reappearance poses a threat to local ecosystems, with biologists raising concerns over its status as an invasive species.
Key information
- The arapaima, a large freshwater fish, was believed to be extinct 30 years ago.
- It is currently spreading in Brazilian rivers, disrupting local ecosystems.
- Biologists warn of its invasive nature and its impact on indigenous species.
The arapaima, one of the largest freshwater fish globally, has resurfaced in Brazilian rivers. Although considered extinct three decades ago, its presence is now becoming increasingly visible beyond the Amazon region.
Biologists from UNESP University in São Paulo are raising alarms about the arapaima's spread to areas thousands of kilometres from its natural habitats. It is already found in six Brazilian states, including Bahia, São Paulo, Minas Gerais, Mato Grosso, Mato Grosso do Sul, and Amazonas.
Lidiane Franceschini, a Brazilian biologist, warns that the arapaima, which can grow up to 2 metres in length, is destroying many endemic species, disrupting local ecosystems. Its presence can lead to a decline in populations of animals vital to regional fisheries.
The presence of this fish can lead to a decline in animal species populations important for regional fisheries, said the expert as quoted by the Revista Planeta.
The voracious nature of the arapaima
The arapaima primarily hunts fish and crustaceans, but occasionally preys on amphibians, reptiles, and even birds. The issue is not only its voracity but also the fact that many rivers already lack natural predators.
The increased presence of arapaima in Brazilian rivers outside the Amazon has become especially apparent since 2022. Biologists are deliberating on steps to take to minimise its negative impact on local ecosystems.
