Item Details

Title: Impacts of introducing Nile tilapia on the fisheries of a tropical reservoir in North-eastern Brazil

Date Published: 2011
Author/s: J . L . ATTAYDE, J . BRASIL & R . A . MENESCAL
Data publication:
Funding Agency :
Copyright/patents/trade marks: Blackwell Publishing Ltd
Journal Publisher: Fisheries Management and Ecology
Affiliation: Departamento de Botaˆnica, Ecologia e Zoologia, Centro de Biocieˆncias, Universidade Federal do Rio Grande do Norte, Campus
Universita´rio Lagoa Nova, Natal, RN, Brasil
Keywords: biological invasions, exotic species, freshwater fishes, reservoirs, semi-arid tropics


Nile tilapia, Oreochromis niloticus (L.), has been introduced in most tropical and subtropical regions of
the world to improve inland fisheries and aquaculture. This species is generally viewed as beneficial where
introduced, but the environmental impacts of its widespread introductions are uncertain and not well understood.
In this study, a 30-year time series of fisheries records from a tropical reservoir was divided into five equal periods
of 6 years and compared. The introduction of Nile tilapia did not increase the total catch-per-unit-of-effort
(CPUE), the number of fishers actively fishing or their per capita income. Conversely, a significant reduction in the
CPUE of other commercially important species was observed after the introduction of Nile tilapia in the reservoir.
Although other factors cannot be rule out as possible explanations of the observed changes in the reservoir
fisheries, the results are consistent with the hypothesis that these changes may have been caused, at least partially, by the introduction of the Nile tilapia.