[MARMAM] New publication: An illuminating idea to reduce bycatch in the Peruvian small-scale gillnet fishery

Jeffrey C. Mangel jeffrey_mangel at yahoo.com
Fri Dec 6 05:53:19 PST 2019

My co-authors and I are pleased to announce our recent publication in
Biological Conservation:


Alessandra Bielli, J. Alfaro-Shigueto, P.D. Doherty, B.J. Godley, C. Ortiz,
A. Pasara, J.H. Wang, J.C. Mangel. An illuminating idea to reduce bycatch in
the Peruvian small-scale gillnet fishery. 2019. Biological Conservation.
doi: https://doi.org/10.1016/j.biocon.2019.108277


Abstract: Found in the coastal waters of all continents, gillnets are the
largest component of small-scale fisheries for many countries. Numerous
studies show that these fisheries often have high bycatch rates of
threatened marine species such as sea turtles, small cetaceans and seabirds,
resulting in possible population declines of these non-target groups.
However, few solutions to reduce gillnet bycatch have been developed. Recent
bycatch reduction technologies (BRTs) use sensory cues to alert non-target
species to the presence of fishing gear. In this study we deployed light
emitting diodes (LEDs) - a visual cue - on the floatlines of paired gillnets
(control vs illuminated net) during 864 fishing sets on small-scale vessels
departing from three Peruvian ports between 2015 and 2018. Bycatch
probability per set for sea turtles, cetaceans and seabirds as well as catch
per unit effort (CPUE) of target species were analysed for illuminated and
control nets using a generalised linear mixed-effects model (GLMM). For
illuminated nets, bycatch probability per set was reduced by up to 74.4 %
for sea turtles and 70.8 % for small cetaceans in comparison to
non-illuminated, control nets. For seabirds, nominal BPUEs decreased by 84.0
% in the presence of LEDs. Target species CPUE was not negatively affected
by the presence of LEDs. This study highlights the efficacy of net
illumination as a multi-taxa BRT for small-scale gillnet fisheries in Peru.
These results are promising given the global ubiquity of small-scale net
fisheries, the relatively low cost of LEDs and the current lack of alternate
solutions to bycatch.


The paper is available at:



Please contact us if you have any questions:

bielli.alessandra at gmail.com

Jeffrey_mangel at yahoo.com


Kind regards,


Jeffrey C. Mangel, PhD


Calle Jose Galvez 780-E

Lima 15074, Peru

Tel: +51-1-2413081

 <http://www.prodelphinus.org/> www.prodelphinus.org

 <http://www.facebook.com/ProDelphinus> ProDelphinus on Facebook

 <https://www.researchgate.net/profile/Jeffrey_Mangel> ResearchGate profile

Skype: mangelman


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