Mitigating impacts of fishing on pelagic ecosystems
15-18 Oct 2012 Montpellier (France)
Thursday 18

› 15:05 - 15:25 (20min)
› Auditorium
Preliminary results of bycatch mitigation techniques before and during setting in the tuna purse seine fishery
Fabien Forget  1, 2, 3, *@  , John David Filmalter  1, 3, 4@  , Laurent Dagorn  5@  
1 : Rhodes University
Private Bag 1015, Grahamstown 6140 -  South Africa
2 : South African Institute of Aquatic Biodiversity  (SAIAB)
Private Bag 1015, Grahamstown, 6140 -  South Africa
3 : Institut de Recherche pour le Developpement  (IRD)
Mahe -  Seychelles
4 : South African Institute for Aquatic Biodiversity  (SAIAB)
Private Bag 1015, Grahamstown, 6140 -  South Africa
5 : IRD, France
Mahe, Seychelles -  Seychelles
* : Corresponding author

In order to effectively reduce bycatch mortality in the tuna purse seine fishery, the bycatch could be separated, and released, before it is brought on deck. There are two temporal windows during the purse seining process when bycatch can be separated to maximise their survival: either before the start of the set or during the set but before the catch is brought on deck.

We investigated the potential use of behavioral manipulation of several bycatch species, using the FAD and bait as stimuli, to attract them to designated areas. Firstly, we investigated whether sharks and other bycatch species could be attracted away from the FAD by using bait as a stimulus. Following these trials, similar experiments were conducted within the net, to determine whether the bycatch can be attracted out of the net using both the FAD and bait as stimuli. The outcome of these trials led to the proposal of a different mitigation method consisting of an escape panel placed the middle of the net.

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