[MARMAM] New publication on interactions between the Portuguese sardine purse-seine fishery and cetaceans

Ana Marçalo amarcalo at gmail.com
Tue May 12 02:44:30 PDT 2015

Dear Marmams,

I am very pleased to announce the following publication which is now
available online:

Quantification of interactions between the Portuguese sardine purse-seine
fishery and cetaceans
Ana Marcalo; Isidora Katara; Diana Feijo; Helder Araujo; Isabel Oliveira;
Jorge Santos; Marisa Ferreira; Silvia Monteiro; Graham J. Pierce; Alexandra
Silva; Jose Vingada 2015. ICES Journal of Marine Science; doi:


Interactions between cetaceans and the purse-seine fishery operating along
the whole Portuguese continental coast were studied based on on-board
observations from 2010 to 2011. Cetacean presence and mortality were
estimated and characteristics under which interactions were most likely to
occur were identified. Observations were made on 163 fishing trips (0.7% of
the average annual number of fishing trips) and 302 fishing
operations/hauls. Cetaceans were present during 16.9% of fishing events;
common dolphins (Delphinus delphis) accounted for 96% of occurrences,
mostly overnight in summerand early autumn. Regression models showed that
cetacean presence during a fishing setwas significantly (p , 0.05)
associated with sardine catches, effort, and latitude/longitude.
Encirclement and mortality occurred in 2.3 and 1.0% of fishing events,
respectively. Encircled species were thecommondolphin, bottlenose dolphin
(Tursiops truncatus), and harbour porpoise (Phocoena phocoena), but only
common dolphin showed mortality (three individuals); raised to fleet level,
estimated total mortality rates of common dolphinswere 69 (95% CI 37–110)
in the north and 91 (95% CI 55–165) in the south for 2010 and 78 (95% CI
47–140) in the south only for 2011. The estimated annual mortality rate due
to purse seining is 113 (95% CI 3–264)commondolphins, which is0.63% of the
current most optimistic estimate of population size for the Portuguese
fishing area (SCANS II). The wide confidence limits, as well as variation
between years, reflect low observer coverage, emphasizing the need for
increased monitoring to cover gaps in the spatial and seasonal distribution
of observer effort and provide reliable estimates of bycatch.

For an early view of this paper, please visit:


If you are unable to download the article, please contact me at
amarcalo at gmail.com for a PDF copy.

Best wishes,

Ana Marçalo

Ana Marçalo
Postdoctoral researcher
CESAM (Centro de estudos do ambiente e do Mar)
University of Aveiro

Fisheries/Marine mammal biologist
(Sociedade Portuguesa de Vida Selvagem/Portuguese Wildlife Society)
University of Minho

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