Abstract
In the metric “Relative Impact Potential” (RIP), the functional response (FR) of a non‐native species can be compared with that of a native analogue and combined with the species abundance to predict its environmental impact. Here, using the River Guaraguaçu (Brazil) as a case study, this methodology was implemented to identify the impacts of the non‐native channel catfish Ictalurus punctatus (Rafinesque) compared with a native species Rhamdia quelen (Quoy & Gaimard) towards small prey fish. Both species exhibited Type II FRs, but handling times were lower for I. punctatus, resulting in a greater maximum feeding rate in this species. Consequently, an RIP > 1 was found, indicating that I. punctatus represents a superior impact to prey compared with its native analogue. These results demonstrate that I. punctatus is a potential threat to small endangered fish species; therefore, policies to avoid escapes from aquaculture should be created and the abundance of I. punctatus controlled.
Original language | English |
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Pages (from-to) | 570-577 |
Number of pages | 8 |
Journal | Fisheries Management and Ecology |
Volume | 26 |
Issue number | 6 |
Early online date | 5 Jun 2019 |
DOIs | |
Publication status | Published - 16 Nov 2019 |
Keywords
- alien species
- aquaculture
- fish
- fresh water
- management
- Relative Impact Potential