[MARMAM] New publication: Predicting Interactions between Common Dolphins and the Pole-and-Line Tuna Fishery in the Azores

Maria João Cruz m.joao83 at gmail.com
Thu Nov 17 16:20:25 PST 2016

Dear Colleagues,

My co-authors and I are pleased to announce the publication of the
following paper:

Cruz MJ, Menezes G, Machete M, Silva MA
Predicting Interactions between Common Dolphins and the Pole-and-Line Tuna
Fishery in the Azores.
PLoS ONE 11(11): e0164107. DOI:10.1371/journal.pone.0164107

A PDF version of the paper is available online at:


or via email request to: m.joao83 at gmail.com


Common dolphins (*Delphinus delphis*) are responsible for the large
majority of interactions with the pole-and-line tuna fishery in the Azores
but the underlying drivers remain poorly understood. In this study we
investigate the influence of various environmental and fisheries- related
factors in promoting the interaction of common dolphins with this fishery
and estimate the resultant catch losses. We analysed 15 years of fishery
and cetacean interaction data (1998-2012) collected by observers placed
aboard tuna fishing vessels. Dolphins interacted in less than 3% of the
fishing events observed during the study period. The probability of dolphin
interaction varied significantly between years with no evident trend over
time. Generalized additive modeling results suggest that fishing duration,
sea surface temperature and prey abundance in the region were the most
important factors explaining common dolphin interaction. Dolphin
interaction had no impact on the catches of albacore, skipjack and
yellowfin tuna but resulted in significantly lower catches of bigeye tuna,
with a predicted median annual loss of 13.5% in the number of fish
captured. However, impact on bigeye catches varied considerably both by
year and fishing area. Our work shows that rates of common dolphin
interaction with the pole-and-line tuna fishery in the Azores are low and
showed no signs of increase over the study period. Although overall
economic impact was low, the interaction may lead to significant losses in
some years. These findings emphasize the need for continued monitoring and
for further research into the consequences and economic viability of
potential mitigation measures.

Kind regards,

Maria João


Maria João Cruz
PhD student
Department of Oceanography and Fisheries (DOP)
MARE–Marine and Environmental Sciences
IMAR - Centre of the Institute of Marine Research
University of the Azores
9901-862 Horta, Portugal
Email: m.joao83 at gmail.com
Phone: (+351) 292 200 400
Fax: (+351) 292 200 411
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