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www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Copyrig
ht:
South West Marine Ecosystems
conference
April 2014
Ruth Williams, Cornwall Wildlife
Trust
The Future is bright, the future is yellow!
The Banana Pinger Trial.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Cornwall Wildlife Trust Marine Strandings
Network
Investigating deaths of marine mammals
Photo Paul Semmens
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Causes of death 1990-2011 (based on necropsies)
Necropsy data courtesy of CSIP
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Protecting Cornwalls wildlife for the future
(01872) 273939
CWT pinger trials - Prevent accidental entanglement of cetaceans
in inshore fishing nets
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Protecting Cornwalls wildlife for the future
(01872) 273939
The Aquamark Pinger
Results showed the devices to be effective
48% reduction in harbor porpoise activity
The last trial highlighted some serious concerns, relating to battery life and cost of
the pingers tested.
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Protecting Cornwalls wildlife for the future
(01872) 273939 The Pinger Project journal article
- JCRM 12-1 pp 85-90
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Protecting Cornwalls wildlife for the future
(01872) 273939
The Banana Pinger
Fishtek Ltd., based in Devon, have developed the Banana pinger as a direct result of
previous work in the Cornish fishery.
The unit performs in the same acoustic range as the Aquamark, but addresses key issues of
cost, ease of use and monitoring, and battery life.
Specifically designed to meet the EU regulations on sound frequency and power.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
This study of the Banana Pinger
consisted of two investigations:
Cycling pinger trial to investigate behavioural effects of the Banana
Pinger on porpoise and dolphins, such
as possible long-term displacement
and the rate and degree of
habituation of porpoises to a pinger.
Use in a fishery to test the
effectiveness of this device at
deterring cetaceans from inshore set
nets and assess their practicality in a
normal commercial fishery setting.
Photo Cornwall Wildlife Trust
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
C-POD Acoustic
monitoring systems
Level of by-catch is too low
to statistically prove the
effectiveness of pingers
over a short time period
using actual bycatch rates.
CPoDs give us the ability
to infer changes in
behaviour due to pingers by
recording all acoustic
activities.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Cycling pinger deployment
Single modified pinger 21 hour cycle.
Long term fixed mooring in 40 m of water.
With associated C-POD.
Additional C -POD 150 m away to record the
activity of dolphins without interference of the
pinger.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Cycling pinger trial Results
- Black line when pinger is on. Purple colouration is porpoise clicks.
- Effect of pinger click detections falling to 27% when pinger ON
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Protecting Cornwalls wildlife for the future
(01872) 273939
Cycling pinger trial Results
Habituation - There is variation, but no evidence of any diminishing trend in pinger effect over the 8 months.
Effect on porpoise Reduces activity to 27% when pinger is ON.
Effect on dolphins Reduces activity to 75% when pinger is ON.
150m from pinger ON OFF
hours 1547 1420
clicks 7591 9341
Clicks/m 4.9 6.6
Detections falls to: ON/OFF 75%
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
A total of 160.6 soak days of nets with and without
pingers were recorded.
Effectiveness of
device at
deterring
cetaceans
Real time fishery results
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Protecting Cornwalls wildlife for the future
(01872) 273939
Type of fishery tangle netting
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Protecting Cornwalls wildlife for the future
(01872) 273939
Real time fishery deployment method
Pingers spaced at 200m intervals
on lead line.
Acoustic
monitoring device
(CPoD)
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
There was a gap in fishing activity due to bad weather
in November, December and January 2013, but results
show a lower number of porpoise clicks from nets with
pingers present than from nets without pingers.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Table below shows an average reduction of porpoise click detections to 18%
on pingered nets compared to non-pingered nets.
No bycatch of cetacean species was recorded in either the pingered or
control nets.
Skipper Hours N of clicks P N of clicks
NP P/NP ratio
Vessel 1 2204 6061 31310 19%
Vessel 2 932 185 2616 7%
Vessel 3 167 11 508 2%
Vessel 4 44 64 166 39%
ALL 3347 6321 34600 18%
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Practicality of pinger
Handling good. One button holing, none after adjustment of practices.
Stay on nets no hazard.
Problem with some net rigging systems - sliding.
Problem with popping out of casing under tension.
Good battery life.
LED light pros and cons.
Effect on seals.
Worries on cost.
Bycatch not seen as problem.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Conclusions
Banana Pinger is suitable for deployment in an inshore set net fishery and shows a strong pinger effect that can be expected to translate into a greatly reduced risk of bycatch.
It also gives confidence that habituation is not a problem.
There is also strong evidence of a response by dolphins to the Banana Pinger, displayed in the cycling pinger trials.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
CWT Recommendations
That a wider trial of Banana Pingers should be promoted to
all under-12m vessels using gill nets within Cornwalls territorial
waters (0-12 nm) as a voluntary method to reduce cetacean
bycatch.
Banana Pinger trials in other fishing areas in the UK.
Effort into raising consumer and public awareness of
vessels using pingers as being dolphin friendly and promote
these vessels as using sustainable practices.
Further work to assess the durability and suitability of the
Banana Pinger as bycatch mitigation device on over-12m
vessels is undertaken.
www.cornwallwildlifetrust.org.uk
Protecting Cornwalls wildlife for the future
(01872) 273939
Thank you for your attention
Towards a common, coherent and efficient response to cross-border challenges
Vers une rponse commune, cohrente et efficace aux dfis transfrontaliers PANACHE
Ruth Williams
Marine Conservation Manager
ruth.williams@ cornwallwildlifetrust.org.uk
Abby Crosby
Marine Conservation Officer