ISI FISH poster4

SMART
DRUM LINE
The first real time alert buoy fishing gear
for maximizing the survival rate of catches :
A new application developed in Reunion Island
Christophe Perry, David Guyomard, François Pino, Gildas Bodilis
1 CRPMEM La Réunion, 47, rue Evariste de Parny, BP 295, 97827 Le Port Cedex,Reunion Island, FRANCE
2 Marine Instruments, Rua dos Padrons N°4 Vial 3, 36350 NIGRAN, SPAIN
3 ISI-FISH, 10 A rue du moulin à vent, 29900 CONCARNEAU, FRANCE
* corresponding author : [email protected]
Introduction
For 3 years the Reunion Island has suffered from shark attacks on it’s beaches
causing numerous bans for bathers on the island’s most popular beaches.
To reduce the shark attack risk, one scientific programme Cap Requin has been
set up in December 2013 by the CRPMEM of Reunion Island (organisation of fishermen).
Christophe Perry and David Guyomard of CRPMEM Reunion have developed a
new type of fishing gear to catch sharks and by-catch and release it live :
the smart drum line.
This project was undertaken along with François Pino of Marine Instruments,
Gildas Bodilis of Isi-Fish and with the advice of Geremy Cliff of KZNSB.
Materials and methods
This new fishing gear is a Smart Drum Line made up of a classic drum line,
a MLI-S GPS satellite buoy and the CATCH-A-LIVE system.
The Smart Drum Line :
The Catch-A-Live system :
A “classic” drum line consists of an anchored fishing gear, with a big floating
buoy (the “drum”) at the surface and a baited hook attached to the fishing line.
Consists of an adapted triggering system installed between the hook leader,
and a protected magnet linked to an electronic GPS buoy. When triggered by
the traction of the catch along the leader, the buoy alert system is switched on.
The drumline becomes “smart” as soon as it is equipped with the
Catch-A-Live system, enabling to get instantaneous alerts in the case of a
catch and to retrieve live animals on the hooks.
MLI-S model GPS satellite buoy :
Figure 1: MLI-S buoy manufactured by Marine Instruments
Drumline buoy
MLI-s© buoy
Anchored buoy
60 l
Triggering
magnet
Triggering
line
Baited hook
Anchor
Satellite real time
GPS alert
MLI-s© buoy
Drumline buoy
Anchored buoy
Figure 2 : MLI-S buoy satellite transmission system
60 l
20-25m
The MLI-S buoy has a satellite positioning
system which transmits it’s position via Iridium
satellite network to the user.
It is equipped with a GPS, a satellite transceiver,
double power system: solar panels connected
with a rechargeable battery, a pack of alkaline
batteries and a flash to help the recovery of the
buoy.
The advantages of this buoy are the global coverage through the Iridium network and unlimited
autonomy thanks to its solar panels.
The user receives the messages of the GPS buoy
position by e-mail and/or by satellite reception
via MSR on board (software with C-map chart).
At this time, the buoy sends a message alert along with it’s GPS position to the
fisherman in less than 5 minutes.
It simply requires that the fisherman is equipped with a receiver for emails
(computer, smartphone in coastal areas or satellite phone off coverage).
20-25m
In order to attract sharks at short distances, the hooks are baited with big but
low fat fish (milkfish, mullet…).
Figure 3: triggering line magnet plugged into the MLI-S buoy
Triggering
magnet
Traction
Anchor
Experiments of Smart Drum Line
The first experiment of the Smart Drum Line system conducted in Reunion
Island in order to maximize survival rates of catches took place during 4
months, between January and May 2014.
Two Smart Drum Lines were first installed in coastal areas (20 meters depth
sand bottom) from mid-January to mid-April, in total 4 fishing gears were
deployed.
One fisherman watched both buoys and was ready to intervene in every MLI-S
alert message. He worked with the buoys and the bait on the hook, to verify that
the system was always effective.
Improvements have been proposed to the triggering system since catches
occurred without alerts : 3 times, due to small animals or bad functioning ; also
alerts occurred without catches : 6 times but occurred on the same buoy due to
bad configuration.
Results
N°
1
From January 14th to May 16 th, the Smart Drum Lines installed in coastal areas
have already enabled the catch of 33 live animals out of 36 total catches.
91.7% is the global survival rate, 100 % for most species except for hammerhead sharks, which have a 50 % survival rate and 75% for giant trevally.
It increases the survival rate by 50% for hammerhead sharks and 70/75% for
tiger/bull targeted sharks compared to similar situations (Sumpton et al., 2011).
15 animals have been tagged before released, in very good health condition
thanks to the Smart Drum Line system.
ALIVE AND
STRONG
2
3
4
5
ALIVE BUT
WEAK
6
7
8
9
10
DEAD BUT
INTACT
11
12
13
14
15
Conclusion
The interests of the Smart Drum Line are :
- real time “live” alerts,
- to catch and release live animals,
- continuous surveillance,
- time and money saving.
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17
18
The Smart Drum Line is specially adapted to :
- green strategy for shark control programs
(Hazin and Afonso, 2013),
- tag and release scientific programs.
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20
21
22
23
24
25
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27
Ref:
Sumpton W.D., Taylor S.M., Gribble N.A., Mc Pherson G. and Ham T., 2011. Gear selectivity of large-mesh nets and drumlines used to catch sharks in the Queensland Shark Control Program. African Journal of Marine Science,
33(1), pp. 37–43
Hazin F.H.V and Afonso A.S., 2013. A green strategy for shark attack mitigation off Recife, Brazil. Animal Conservation. doi: 10.1111/acv.12096
28
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31
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Caught and released Animals :
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35
36
TIME OF
ALARM
TIME OF
INTERVENTION
16/01/2014
09:45
20/01/2014
23:55
21/01/2014
21:00
21/01/2014
22:20
22/01/2014
19:55
22/01/2014
20:35
23/01/2014
09:00
24/01/2014
05:35
27/01/2014
09 :00
28/01/2014
12:00
30/01/2014
19:50
31/01/2014
19:50
04/02/2014
05:00
04/02/2014
07:00
10/02/2014
05:05
14/02/2014
01:05
16/01/2014
10:45
21/01/2014
00:15
21/01/2014
21:15
21/01/2014
22:40
22/01/2014
21:30
22/01/2014
21:50
23/01/2014
10:30
24/01/2014
06:25
27/01/2014
10:20
28/01/2014
13:15
30/01/2014
21:25
31/01/2014
19:50
04/02/2014
05:25
04/02/2014
08:50
10/02/2014
05:25
14/02/2014
02:55
04/03/2014
07:30
04/03/2014
22:00
07/03/2014
04:40
18/03/2014
17:00
19/03/2014
21:30
19/03/2014
22:50
25/03/2014
23:45
09/04/2014
08:00
10/04/2014
20:55
11/04/2014
16:30
15/04/2014
20:40
22/04/2014
22:00
29/04/2014
06:15
29/04/2014
07:20
29/04/2014
12:50
29/04/2014
23:10
30/04/2014
07:00
30/04/2014
16:25
13/05/2014
02:45
16/05/2014
06 :30
No alarm
04/03/2014
21:40
07/03/2014
03:00
18/03/2014
17:00
19/03/2014
20:00
19/03/2014
22:20
25/03/2014
21:55
08/04/2014
20:00
10/04/2014
20:50
11/04/2014
16:30
15/04/2014
19:10
22/04/2014
20:35
29/04/2014
05:20
No alarm
29/04/2014
11:05
29/04/2014
21:50
No alarm
30/04/2014
15:45
13/05/2014
01:50
16/05/2014
02 :00
DURATION OF
INTERVENTION
(h)
01:00
00:20
00:15
SPECIES
Caranx
ignobilis
Galeocerdo
cuvier
Galeocerdo
cuvier
Sexe
Length
(cm)
120
M
319
M
353
00:20
Sphyrna lewini
F
250
01:35
Sphyrna lewini
M
300
M
305
F
300
01:15
01:30
Nebrius
ferrugineus
Galeocerdo
cuvier
00:50
Dasyatis spp
120
01:20
Dasyatis spp
100
01:15
01:35
00:00
00:25
Caranx
ignobilis
Rhynchobatus
djiddensis
Nebrius
ferrugineus
Galeocerdo
cuvier
130
347
M
M
385
01:50
Dasyatis spp
00:20
Dasyatis spp
01:50
Carcharhinus
leucas
M
300
-
Sphyrna lewini
M
158
M
303
M
280
00:20
01:40
00:00
01:30
Nebrius
ferrugineus
Galeocerdo
cuvier
Rhynchobatus
djiddensis
Carcharhinus
leucas
170
150
F
205
00:30
Dasyatis spp
80
01:50
Dasyatis spp
100
12:00*
Dasyatis spp
100
00:05
Rhynchobatus
djiddensis
00 :00
Dasyatis spp
01 :30
Dasyatis spp
01 :25
00 :55
Rhynchobatus
djiddensis
Rhynchobatus
djiddensis
CONDITION
F
245
M
110
F
180
F
236
-
Dasyatis spp
120
01:45**
Caranx
ignobilis
138
01:55
Dasyatis spp
-
Galeocerdo
cuvier
80
07:00
Dasyatis spp
100
00:40
Sphyrna lewini
04 :30*
Caranx
ignobilis
M
M
90
283
110
*: no immediate intervention due to bad weather conditions
Placing a tag
on a giant guitarfish
**: fisherman smartphone out of order
Tawny nurse shark tagged
and ready to be released
Giant guitarfish ready to be released
Tiger shark tagged
with acoustic tag
Scalloped hammerhead shark
tagged and ready to be released
A smart drumline equipped
with the Catch-A-Live system
Tag placed on a giant guitarfish
FATE
RETAINED ON
BOARD
RETAINED ON
BOARD
RETAINED ON
BOARD
TAGGED AND
RELEASED
RETAINED ON
BOARD
TAGGED AND
RELEASED
RELEASED
ALIVE
RELEASED
ALIVE
RELEASED
ALIVE
TAGGED AND
RELEASED
TAGGED AND
RELEASED
TAGGED AND
RELEASED
RETAINED ON
BOARD
RELEASED
ALIVE
RELEASED
ALIVE
RETAINED ON
BOARD
RETAINED ON
BOARD
RELEASED
ALIVE
TAGGED AND
RELEASED
RELEASED
ALIVE
RETAINED ON
BOARD
RELEASED
ALIVE
RELEASED
ALIVE
RELEASED
ALIVE
TAGGED AND
RELEASED
RELEASED
ALIVE
TAGGED AND
RELEASED
TAGGED AND
RELEASED
TAGGED AND
RELEASED
TAGGED AND
RELEASED
RETAINED ON
BOARD
TAGGED AND
RELEASED
RELEASED
ALIVE
TAGGED AND
RELEASED
TAGGED AND
RELEASED
TAGGED AND
RELEASED

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