![Page 1: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/1.jpg)
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
![Page 2: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/2.jpg)
Source: A. Fonteneau
Tuna purse seine FAD associated catch by species
● skipjack● yellowfin● bigeye
Friday, December 16, 11
![Page 3: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/3.jpg)
Research Approach
Friday, December 16, 11
![Page 4: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/4.jpg)
Research Approach
Advection (u,v)
Diffusion (D)
Friday, December 16, 11
![Page 5: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/5.jpg)
Research Approach
Advection (u,v)
Diffusion (D)
FADs
Friday, December 16, 11
![Page 6: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/6.jpg)
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
![Page 7: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/7.jpg)
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
![Page 8: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/8.jpg)
• 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?
Friday, December 16, 11
![Page 9: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/9.jpg)
Types of sets
Photos D. Itano
Photos D. Itano
Photos D. Itano
log
drifting FAD
anchored FAD
Friday, December 16, 11
![Page 10: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/10.jpg)
Fisheries data
2006 2007
20092008
● log● dFAD● aFAD
PNG PNG
PNGPNG
PNGPNG
0"
2000"
4000"
6000"
8000"
10000"
12000"
2006" 2007" 2008" 2009"
Friday, December 16, 11
![Page 11: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/11.jpg)
➜ 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.
Friday, December 16, 11
![Page 12: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/12.jpg)
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
Friday, December 16, 11
![Page 13: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/13.jpg)
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
Friday, December 16, 11
![Page 14: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/14.jpg)
2006
2008
1150mm
950mm
Natural log & Rainfall
Friday, December 16, 11
![Page 15: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/15.jpg)
Anchored FAD (aFAD)
Friday, December 16, 11
![Page 16: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/16.jpg)
Anchored FAD (aFAD)
aFAD
Friday, December 16, 11
![Page 17: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/17.jpg)
Anchored FAD (aFAD)
• K nearest neighbor (KNN) classification
aFAD
d1 d2
d3 d4
d5
d6
d7
r
Friday, December 16, 11
![Page 18: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/18.jpg)
number of aFAD:4709
2155
Friday, December 16, 11
![Page 19: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/19.jpg)
0 2 4 6 8 10 12
distance (NM)
freq
uenc
y
Anchored FAD (aFAD)
• Distance frequency between the aFADs
Friday, December 16, 11
![Page 20: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/20.jpg)
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
![Page 21: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/21.jpg)
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
![Page 22: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/22.jpg)
Thank you.
Friday, December 16, 11
![Page 23: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/23.jpg)
Friday, December 16, 11
![Page 24: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/24.jpg)
Friday, December 16, 11
![Page 25: Understanding the distribution of Fish Aggregating Devices](https://reader031.vdocuments.site/reader031/viewer/2022020910/6200460f4d26e82d4b793a07/html5/thumbnails/25.jpg)
4
Temperatures have increased(UU\HS�TH_PT\T�HUK�TPUPT\T�[LTWLYH[\YLZ�OH]L�PUJYLHZLK�PU�7VY[�4VYLZI`�ZPUJL�� ����-PN\YL ����4H_PT\T�[LTWLYH[\YLZ�OH]L�PUJYLHZLK�H[�H�YH[L�VM������*�WLY�KLJHKL�ZPUJL�� ����;OLZL�[LTWLYH[\YL�increases are consistent with the
NSVIHS�WH[[LYU�VM�^HYTPUN��
-PN\YL��! Annual average temperature for Port Moresby. Light blue bars
indicate El Niño years, dark blue bars indicate La Niña years and the
grey bars indicate neutral years.
-PN\YL��! Annual rainfall for Port Moresby. Light blue bars indicate El Niño
years, dark blue bars indicate La Niña years and the grey bars indicate
neutral years.
Papua New Guinea»s JOHUNPUN�JSPTH[L
Port Moresby’s rainfall unchanged+H[H�ZPUJL�� ���ZOV^�UV�JSLHY�[YLUKZ�in annual or seasonal rainfall at Port
4VYLZI`��-PN\YL�����/V^L]LY��H[�2H]PLUN�[OLYL�OHZ�ILLU�H�KLJYLHZL�PU�^L[�ZLHZVU�YHPUMHSS��6]LY�[OPZ�WLYPVK��there has been substantial variation in
YHPUMHSS�MYVT�`LHY�[V�`LHY�H[�IV[O�ZP[LZ�
Sea level has risen(Z�VJLHU�^H[LY�^HYTZ�P[�L_WHUKZ�JH\ZPUN�[OL�ZLH�SL]LS�[V�YPZL��;OL�TLS[PUN�VM�NSHJPLYZ�HUK�PJL�ZOLL[Z�HSZV�JVU[YPI\[LZ�[V�ZLH�SL]LS�YPZL��
0UZ[Y\TLU[Z�TV\U[LK�VU�ZH[LSSP[LZ�HUK�[PKL�NH\NLZ�HYL�\ZLK�[V�TLHZ\YL�ZLH�SL]LS��:H[LSSP[L�KH[H�PUKPJH[L�[OL�ZLH�level has risen near Papua New Guinea
I`�HIV\[���TT�WLY�`LHY�ZPUJL�� ���;OPZ�PZ�SHYNLY�[OHU�[OL�NSVIHS�H]LYHNL�VM����¶����TT�WLY�`LHY��;OPZ�OPNOLY�YH[L�VM�YPZL�TH`�IL�WHY[S`�YLSH[LK�[V�UH[\YHS�Å\J[\H[PVUZ�[OH[�[HRL�WSHJL�`LHY�[V�`LHY�VY�KLJHKL�[V�KLJHKL�JH\ZLK�I`�WOLUVTLUH�Z\JO�HZ�[OL�,S�5P|V�:V\[OLYU�6ZJPSSH[PVU��;OPZ�]HYPH[PVU�PU�ZLH�SL]LS�JHU�IL�ZLLU�PU�-PN\YL���^OPJO�PUJS\KLZ�[OL�[PKL�NH\NL�YLJVYKZ�ZPUJL�� ���HUK�[OL�ZH[LSSP[L�KH[H�ZPUJL�� ��
6JLHU�HJPKPÄJH[PVU�has been increasing(IV\[�VUL�X\HY[LY�VM�[OL�JHYIVU�KPV_PKL�LTP[[LK�MYVT�O\THU�HJ[P]P[PLZ�LHJO�`LHY�PZ�HIZVYILK�I`�[OL�VJLHUZ��(Z�[OL�extra carbon dioxide reacts with sea
^H[LY�P[�JH\ZLZ�[OL�VJLHU�[V�ILJVTL�ZSPNO[S`�TVYL�HJPKPJ��;OPZ�PTWHJ[Z�[OL�NYV^[O�VM�JVYHSZ�HUK�VYNHUPZTZ�[OH[�JVUZ[Y\J[�[OLPY�ZRLSL[VUZ�MYVT�JHYIVUH[L�TPULYHSZ��;OLZL�ZWLJPLZ�HYL�critical to the balance of tropical reef
LJVZ`Z[LTZ��+H[H�ZOV^�[OH[�ZPUJL�[OL���[O�JLU[\Y`�[OL�SL]LS�VM�VJLHU�HJPKPÄJH[PVU�OHZ�ILLU�ZSV^S`�PUJYLHZPUN�PU�7HW\H�5L^�.\PULH»Z�^H[LYZ�
,S�5P|V� 3H�5P|H
@LHY�
(]LYHNL�;LT
WLYH[\YL��¢*��
�������������������������������������� �
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� �
�
� �
�
����
�
����
�
,S�5P|V� 3H�5P|H
������������������������������������������������
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� ��
�
� �
�
� �
�
����
�
����
�
9HPUMHSS��TT��
@LHY�
Friday, December 16, 11