Understanding the distribution
of Fish Aggregating Devices
(FADs) in the western and
central Pacific Ocean
Eunjung KimUniversity of Hawaii at Manoa
Pelagic Fisheries Research Program
Friday, December 16, 11
Source: A. Fonteneau
Tuna purse seine FAD associated catch by species
● skipjack● yellowfin● bigeye
Friday, December 16, 11
Research Approach
Friday, December 16, 11
Research Approach
Advection (u,v)
Diffusion (D)
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Research Approach
Advection (u,v)
Diffusion (D)
FADs
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hypothesis
�fad(i) < �fad(i+1)
�N
�t=
�
�x(D
�N
�x) +
�
�y(D
�N
�y)� �
�x(uN)� �
�y(vN)� ZN
Advection (u,v)Diffusion (D)
D = L+U � L
1 + e�s(�fad�K)
u = au + Sp · d⇢faddx
v = av + Sp · d⇢faddy
Friday, December 16, 11
hypothesis
�fad(i) < �fad(i+1)
�N
�t=
�
�x(D
�N
�x) +
�
�y(D
�N
�y)� �
�x(uN)� �
�y(vN)� ZN
Advection (u,v)Diffusion (D)
D = L+U � L
1 + e�s(�fad�K)
u = au + Sp · d⇢faddx
v = av + Sp · d⇢faddy
Fish movement is a function of FAD density
Friday, December 16, 11
• Fisheries data (purse seine fishing set data)
- catch (presence)
- date
- location
- types of sets : natural log
drifting FAD (man-made)
anchored FAD (man-made)
How many FADs are there in the WCPO?Where are the FADs?
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Types of sets
Photos D. Itano
Photos D. Itano
Photos D. Itano
log
drifting FAD
anchored FAD
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Fisheries data
2006 2007
20092008
● log● dFAD● aFAD
PNG PNG
PNGPNG
PNGPNG
0"
2000"
4000"
6000"
8000"
10000"
12000"
2006" 2007" 2008" 2009"
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➜ Understanding the process of how the
types of FADs are distributed will allow to
reproduce better FAD density fields for
Advection-Diffusion Reaction & FAD model.
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Natural log
Monthly log set number in years of 2006-2010 & monthly
climatological rainfall in Port Moresby (PNG)rainfall (m
m)
log
sets
4000
3000
1000
2000
0
300
250
200
100
50
0
150
JAN MAR MAY JUL SEP NOV
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http://en.wikipedia.org/wiki/Sepik
20˚N
10˚N
10˚S
20˚S
0
120˚E 140˚E 180160˚E 160˚W
Sepik River
Natural log
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2006
2008
1150mm
950mm
Natural log & Rainfall
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Anchored FAD (aFAD)
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Anchored FAD (aFAD)
aFAD
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Anchored FAD (aFAD)
• K nearest neighbor (KNN) classification
aFAD
d1 d2
d3 d4
d5
d6
d7
r
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number of aFAD:4709
2155
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0 2 4 6 8 10 12
distance (NM)
freq
uenc
y
Anchored FAD (aFAD)
• Distance frequency between the aFADs
Friday, December 16, 11
Results
• The amount of log sets are correlated with rainfall.
• The high density of log sets are close to the mouth of the Sepik river.
• The geographic distributions of anchored FADs are concentrated in certain areas (Bismarck Sea, Solomon Sea).
• The realistic density of aFADs can be inferred by KNN.
• The distance between the aFADs are 4-7 nmi apart in PNG.
Friday, December 16, 11
Future works
• Drifting FAD.
• Using particle tracking tool, reproduce the dFAD distribution (forward tracking or backward tracking)
• What drives the distribution of dFAD?
• Apply the FAD density to ADR&FAD model.
Friday, December 16, 11
Thank you.
Friday, December 16, 11
Friday, December 16, 11
Friday, December 16, 11
4
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