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SC/69A/HIM/15
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Resource ID
20017
Access
Open
Document Number
SC/69A/HIM/15
Full Title
Effectiveness of the use of pingers to reduce the bycatch of Franciscana (Pontoporia blainvillei) in artisanal and industrial fisheries of Uruguay
Author
Sebastian Jimenez, Martin Laporta, Rodrigo Forselledo, Graciela Fabiano, Enrique Paez, Ines Pereyra, Santiago Silveira, Andres Domingo
Authors Summary
The Franciscana Pontoporia blainvillei is considered the cetacean species most affected by fisheries in the southwest Atlantic. Throughout its distribution (Argentina, Uruguay and Brazil) gillnets are the largest source of bycatch, although it is also caught in other fishing gears. In Uruguay, the artisanal gillnet fleet and, to a lesser extent, the industrial pair trawl fleet, are the main fisheries affecting this species. Since 2018, DINARA, in collaboration with fishers from both fleets, has been developing a research program to evaluate the bycatch of Franciscana and test, under commercial fishing conditions, the effectiveness of acoustic deterrent devices, or acoustic alarms (pingers), to reduce its bycatch. In artisanal gillnet fishing, Banana Pingers to deter dolphins and porpoises are being evaluated in fishing vessels operating in the Río de la Plata and the Atlantic coast of Uruguay. These devices emit sounds from 50 to 120 kHz (145 dB re 1 μPa at 1 m). In order to evaluate its effectiveness, two strategies have been implemented: two vessels, one using fishing nets with pingers and the other without pingers, or a single vessel using sections of the nets with pingers and others without pingers. Dolphin Anti-Predation Pingers, which emit high intensity sound signals (175 dB re 1 μPa at 1 m; 40 Khz), are being evaluated in industrial pair trawl fleet. In this case, in each participating pair, one of the vessels trawls its net with pingers, while the other does it without pingers. The results obtained present convincing evidence that pingers significantly reduce the bycatch of Franciscana in the artisanal gillnet fishery, while in the industrial fleet they suggest a moderate reduction, although further research effort is still required
Publisher
IWC
Publication Year
2023