[MARMAM] new article on common dolphin bycatch

Helene Peltier helene.peltier at univ-lr.fr
Sun May 29 07:51:08 PDT 2016


Dear colleagues,
We are glad to inform you that following article
was recently accepted for publication:

Small cetacean bycatch as
estimated from stranding schemes: The common dolphin case in the
northeast Atlantic
Hélène Peltier , Matthieu Authier, Rob Deaville,
Willy Dabin, Paul D. Jepson, Olivier van Canneyt, Pierre Daniel, Vincent

The article can be download until early


*Strong interactions between common dolphins and
fisheries in southern Bay of Biscay.
*Levels of bycatch inferred from
strandings between 3650 and 4700 dolphins year-1.
*Levels of bycatch
inferred from observer programmes around 550 animals year-1.
estimates can set very different management

Death in
fishing gear of non-target
species (called 'bycatch') is a major concern for marine wildlife,
mostly worrying for long-lived species like cetaceans, considering
their demographic characteristics
(slow population growth rates and low
fecundity). In European waters, cetaceans are highly impacted by
phenomenon. Under the Common Fishery Policy, the EC 812/2004 regulation
constitutes a legal
frame for bycatch monitoring on 5-10% of
vessels >15 m. The aim of this work was to compare
parameters and
bycatch estimates of common dolphins (Delphinus delphis) provided by
programmes in France and UK national reports and those inferred
from stranding data, through two
approaches. Bycatch was estimated from
stranding data,
first by correcting effectives from drift
(using a drift prediction model) and then by estimating the probability
of being buoyant.
Observer programmes on
fishing vessels allowed us to
identify the specificity of the interaction between
common dolphins
fishing gear, and provided low estimates of annual bycaught animals
550 animals year1). However, observer programmes are hindered
by logistical and administrative
constraints, and the sampling scheme
seems to be poorly designed for the detection of marine
bycatches. The analyses of strandings by considering drift
conditions highlighted areas with high levels of
interactions between
common dolphins and
fisheries. Since 1997, the highest densities of
dolphins at sea were located in the southern part of the
continental shelf and slope of the Bay of Biscay.
Bycatch numbers
inferred from strandings suggested very high levels, ranging from 3650
dolphins year1
[2250-7000] to 4700 [3850-5750] dolphins year1,
depending on methodological choices. The main
advantage of stranding
data is its large spatial scale, cutting across administrative
boundaries. Diverging
estimates between observer programmes and
stranding interpretation can set very different
management consequences:
observer programmes suggest a sustainable situation for common
whereas estimates based on strandings highlight a very worrying and
unsustainable process.

Best wishes
Helene Peltier


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