[MARMAM] New article: Interactions between air-breathing marine megafauna and artisanal fisheries in Southern Iberian Atlantic waters: Results from an interview survey to fishers

Ana Marçalo amarcalo at ualg.pt
Thu Jul 7 08:09:00 PDT 2022


 Dear MARMAN Subscribers,

On behalf of my co-authors, I am pleased to announce the publication of our
new research in Fisheries Research.

Alexandre, S., Marçalo, A., Marques, T.A., Pires, A., Rangel, M.,
Ressurreição, A., Monteiro, P., Erini, K., Gonçalves J.M.S. 2022. Interactions
between air-breathing marine megafauna and artisanal fisheries in Southern
Iberian Atlantic waters: Results from an interview survey to fishers.
Fisheries Research.
DOI: 10.1111/mms.12945

ABSTRACT

The coastal waters off Western Iberia are an important fishing ground and a
marine megafauna foraging area. Overlap between fishery target species and
the diet of several air breathing marine megafauna species can lead to
negative interactions and consequently conservation and economic issues.
This work aimed to assess marine megafauna (cetaceans, marine birds, and
marine turtles) – fishery interactions through face-to-face interviews to
fishers of the local and coastal artisanal fisheries fleets in the landing
sites of the Portuguese mainland Southern
coast (Algarve). The main goal was to identify and evaluate problematic
interactions known to cause bycatch or economic loss through depredation.
We found that bycatch is a concern for all marine megafauna groups, but
depredation problems are mostly associated with cetaceans. Of the sampled
artisanal fisheries (longlines, pots and traps, bottom set-nets, and purse
seine), the fishing gears of most concern were purse seine and coastal
bottom set-nets. Purse seine showed problems associated with important
bycatch numbers, especially of common dolphins, Delphinus delphis, while
bottom set-nets have considerable bycatch of all animal groups and
depredation was highly associated with bottlenose dolphins, Tursiops
truncatus. Bycatch and depredation were found to be species, gear, area,
and vessel size dependent. Economic loss caused by depredation led to catch
and gear damage and was widely reported by bottom set-net fishers, ranging
from 7% to 21% of their revenue. Higher losses were reported for local
vessels in leeward (eastern) Algarve area. This study showed that the
active participation of fishers provides improved localized knowledge on
interactions between local and coastal fisheries and marine megafauna,
allowing for the definition of specific management and mitigation
strategies.


Best wishes.

The full paper may be accessed via this link:
https://www.sciencedirect.com/science/article/pii/S0165783622002077?dgcid=author
or upon request.

Kind Regards,
Ana Marçalo
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