Dear all,
We are pleased to announce following two publications on Black Sea
cetaceans in Bulgarian waters:
Popov D, Meshkova G, Hristova P, Gradev G, Rusev D, Panayotova M,
Dimitrov H (2020). Pingers as cetacean bycatch mitigation measure in
Bulgarian turbot fishery. Acta Zoologica Bulgarica, Suppl. 15. Available
at: http://www.acta-zoologica-bulgarica.eu/Suppl_15_42.pdf
*Abstract**:*
Bycatch(incidental catch) of small cetaceans is a major problem ina
number of gillnet fisheries around the Worldand Harbour porpoise
(/Phocoena phocoena/) is one of the most heavily affected
species.Pingers (acoustic deterrentdevices) are recommended as
mitigation measure to decrease bycatch rate. First large-scale use of
pingers (Future Oceans 10 kHz and 70 kHz models) was made during
standard turbot fishing operations in Bulgarian waters of Black Sea in
2019 during spring and summer – respectively before and after turbot
fishing ban (15 April – 15 June). Four vessels have been involved with
part of the nets being without pingers – control and other parts fitted
with pingers – active. A total of 105 cetaceans (/Phocoena phocoena
relicta/– 104 and /Tursiops truncatus ponticus/ – 1) were recorded as
bycatch in both control and active nets in spring and summer. Bycatch
rates in active and control nets have not shown significant difference
in both seasons. Significant increase in bycatch was registered in both
active and control nets from spring to summer: 3.25 to 38.76 and 1.55 to
58.58 ind.km^-2 .day^-1 respectively.
Key words – /Phocoena//phocoena relicta/, cetacean bycatch, pingers,
turbot fishery, Black Sea
Popov D, Meshkova G, Hristova P, Miteva A, Ilieva T,Dimitrov H (2020).
Pilot Line-transect Surveys of Cetaceans in a Bulgarian Marine Protected
Area: BG0001007 Strandzha Site of Community Importance. Acta zoologica
Bulgarica, Suppl. 15. Available at:
http://www.acta-zoologica-bulgarica.eu/Suppl_15_43.pdf
*Abstract**:*
Three cetacean species inhabit the Black Sea: Black Sea Harbour porpoise
(/Phocoena//phocoena relicta/), Black Sea Bottlenose dolphin
(/Tursiops//truncatus ponticus/) and Black Sea Common dolphin
(/Delphinus//delphis ponticus/). The paper presents the first effort for
estimation of cetacean distribution, density and abundance in marine
area of BG0001007 Strandzha SCI. Two line transect distance sampling
surveys were made in April and May 2016 using a motor sailing yacht as
platform. In May all three Black Sea cetacean species have been
observed, while in April only Harbour porpoise and Bottlenose dolphin
have been detected. In both surveys most abundant was found to be the
Black Sea Harbour porpoise allowing estimation of density (0.871
ind.km^-2 in April and 0.369in May)and abundance (April – 328, CV=33.8%
and May – 139, CV=50%). Abundance and density of dolphins were: 275
(106-714, CV=41.8%) and 0.73 in April and 40 (9-171, CV=56.09%) and
0.107 in May for Bottlenose dolphin; 24 (5-108, CV=58.72%) and 0.063 in
May for Common dolphin. Encounter rates (sightings per kilometer of
effort) during the surveys were as follows: Harbour porpoise - 0.25 in
April and 0.14 in May; Bottlenose dolphin – 0.1 in April and 0.02 in
May; Common dolphin – 0.02 in May.
Key words – Black Sea cetaceans, /Phocoena//phocoena relicta/,
/Delphinus//delphis ponticus/, /Tursiops//truncatus ponticus/,
distance-sampling, abundance.
Best regards,
D. Popov et al.
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__________________________________________________
*__________________________________________________
Dimitar Popov (Mr.)
**Project Coordinator
GREEN BALKANS NGO*
1, Skopie str., office 10
Plovdiv 4004, Bulgaria
Tel: +359 (0) 32 626 977
Fax: +359 (0) 32 635 921
Mobile +359 (0)885 108712
E-mail: [email protected]_
http://www.greenbalkans.org <http://www.greenbalkans.org/>
__________________________________________________
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