Version classiqueVersion mobile
OpenEdition Books

The inland water fishes of Africa

 | 
Didier Paugy
, 
Christian Levêque
, 
Olga Otero

Species introductions

Didier Paugy et Christian Levêque

Résumé

Since antiquity, fish have been introduced and translocated between and within continents. This practice was greatly developed during the 20th century with the primary aim of improving fishing production and fish farming development. Fish have been introduced on every continent, but this chapter focuses only on Africa.
While species introductions have been encouraged more or less throughout the world in order to improve aquaculture production, they have become controversial in recent decades among scientists and aquatic ecosystem managers. The introduction of new species sometimes has enormous consequences on native fish populations. Some believe that humans should not play with fire and that any introduction is causing irreversible damage to native fauna. On the contrary, others think that nature has not necessarily gone in the right direction, and that the introduction of species to improve fisheries production is justified in a number of cases. This debate is far from resolved and should prompt us to adopt a precautionary approach.

Les formats HTML, PDF et ePub de cet ouvrage sont accessibles aux usagers des bibliothèques et institutions qui l'ont acquis dans le cadre de l'offre OpenEdition Freemium for Books. L'ouvrage pourra également être acheté sur les sites de nos libraires partenaires, aux formats PDF et ePub. Si l’édition papier est disponible, des liens vers les librairies sont également proposés sur cette page.

Extrait du texte

Goals of introductions

There have been several introductions of alien fish species to African waters, and many translocations of African fish species within Africa to areas outside their natural ranges (tables 23.I and 23.II) (see also box “Some semantic explanations”). The goals of these introductions are varied, and have been detailed by Welcomme (1988), Moreau et al. (1988), Ogutu-Ohwayo & Hecky (1991) and Lévêque (1997b). Nearly 50 species from other continents have been introduced more or less everywhere in Africa.

Some semantic explanations
(reproduced from Lazard & Lévêque, 2009)
There is some confusion regarding the use of certain terms.
We propose the use of introduction to designate species that have been intentionally or accidentally transported and introduced by humans into a system found outside the natural area of distribution for that species.
Meanwhile, translocations (or transfers) correspond to the deliberate or accidental transport of individuals of a species to other s...

Auteurs

Research director at IRD. He has published numerous works on the systematics, distribution, and ecology of West African fresh water fishes, and expanded the collections of the MNHN in Paris.

Research director at IRD. He has published numerous works on the systematics, distribution, and ecology of West African fresh water fishes, and expanded the collections of the MNHN in Paris.

© IRD Éditions, 2017

Conditions d’utilisation : http://www.openedition.org/6540