The vertical and horizontal distribution of bigeye tuna (Thunnus( albacares) ) related to ocean structure
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1 14 th PICES The vertical and horizontal distribution of bigeye tuna (Thunnus( obesus) ) and yellowfin tuna (Thunnus( albacares) ) related to ocean structure Eun Jung Kim 1,2, Suam Kim 1, Dae-Yeon Moon 2 and Jeong-Rack Koh 2 1 Pukyong National University 2 National Fisheries Research & Development Institute
2 Introduction The tuna fishing area in the Tropical Pacific Longline Fishing area Purse seine Warm pool fishing area NINO3.4 High density area
3 deph Schematic vertical distribution of tuna tspecies in Pacific
4 Skipjack tuna & environmental factors E130 E150 E170 W170
5 Bigeye tuna (Thunnus obesus) Yellowfin tuna (Thunnus albacares)
6 Objective To find the response of spatial & vertical distribution of bigeye & yellowfin tuna related to the oceanographic condition
7 Horizontal distribution of bigeye and yellowfin tuna
8 Fishing data Materials & Methods About 200 Korean longline vessels Jan Dec Catch numbers of bigeye and yellowfin tuna georeferenced in 5 grids of latitude and longitude. Fishing gravity centre of CPUE(G) FISHING in AREA month j G j = i L i (C ij /E ij )/ i (C ij/ E ij )
9 Results Seasonal change (3 months) of fishing centroids N 0 Bigeye tuna 2000 jun-aug 1999 mar-may 2000 march-may 1999 jun-aug 1999 sep-nov 2000 sep-nov dec-feb 5S 170W 160W 150W 140W 130W N Yellowfin tuna jun-aug 1999 mar-may dec-feb 1999 jun-aug 2000 sep-nov 1999 sep-nov S 2000 march-may 170W 160W 150W 140W 130W
10 W W W E Results Monthly change of centroids Longitudinal centroids Latitudinal centroids yellowfin 4 bigeye 4N 2N 2 0 2S -2 4S -4 6S -6 Jan-99 Mar-99 May-99 Jul-99 Sep-99 Nov-99 Jan-00 Mar-00 May-00 Jul-00 Sep-00 Nov-00 Jan-99 Mar-99 May-99 Jul-99 Sep-99 Nov-99 Jan-00 Mar-00 May-00 Jul-00 Sep-00 Nov-00 yellowfin bigeye r=0.449 (<0.05) Not significant What causes this change?
11 Results Longitudinal centroids & SST of NINO3.4 E 130W W W W W 190 Yelloiwfin tuna SST in NINO3.4 Longitudinal centroid of yellowfin W W W 190 SST in NINO3.4 Longitudinal centroid of bigeye W r= (<0.05) E 130W 150W Bigeye tuna (C ) W (C ) Not significant
12 Results Seasonal change (3 months) of fishing centroid N 0 Bigeye tuna 2000 jun-aug 1999 mar-may 2000 march-may 1999 jun-aug 1999 sep-nov 2000 sep-nov dec-feb 5S 170W 160W 150W 140W 130W N Yellowfin tuna jun-aug 1999 mar-may dec-feb 1999 jun-aug 2000 sep-nov 1999 sep-nov S 2000 march-may 170W 160W 150W 140W 130W
13 Results Anomaly of SOI (Southern Oscillation Index) with longitudinal centroids E 130W W 220 Longitude W SOI W 200 W W Jan-99 Mar-99 May-99 Jul-99 Sep-99 Nov-99 Jan-00 Mar-00 May-00 Jul-00 Sep-00 Nov-00
14 Vertical distribution of bigeye and yellowfin tuna
15 Materials & Methods Schematic view of a basket of tuna longline gear Sea surface Float line Float Main line Branch line hook
16 Materials & Methods Fishing data One fishing vessel, Sinyoung 53 August 1999 October 2000 Catch per hook of 211 sets of longline setting FISHING AREA
17 Materials & Methods to calculate the depth of each hook Yoshihara formula (1951,1954) D j =h a +h b +L{(1+cot 2 φ ) 1/2 -[(1-2j/n) 2 +cot 2 φ ] 1/2 } No. of hook Dept h (m) (17) (16) (15) (14) (13) (12) (11) (10) m m m m
18 Materials & Methods Environmental data (TAO buoy data) ( Subsurface temperature (0-500m)
19 Results CPUEs of bigeye and yellowfin tuna in four depth m m m m (No. of fish/1000 hooks) yellowfin bigeye
20 SOI anomaly August September, Jan-99 Mar-99 May-99 Jul-99 Sep-99 Nov-99 Jan-00 Mar-00 May-00 Jul-00 Sep-00 Nov W 150W 140W 130W October April, May August, W 150W 140W 130W W 150W 140W 130W
21 Summary Spatial distribution with season was not clear, but catch locations of both species look coherent longitudinally. Bigeye tuna seem to distribute further east than yellowfin tuna. El Niño might affect on the longitudinal fishing grounds of both species. However, yellowfin tuna response more sensitively to the environmental change than bigeye tuna.
22 Summary Bigeye tuna located in deeper depth than yellowfin tuna. When the SOI was negative (i.e., thermocline was shallow in the western area), the tuna distributions seemed to be located more in the western area, and vice versa. The vertical movement was not clear from our study.
23 Future study Use of more vertical data over longer period Investigation on distribution of several tuna species under dynamical ocean structure
24
25
26 Part 3. Bait selectivity
27 Materials & Methods Bait were used Mackerel Horse mackerel Squid Sardine Herring
28 Results & Discussion fish/100 baits mackerel horse mackerel squid sardine herring bigeye yellowfin
29 Results Bait selectivity of bigeye tuna m m m m (no. of fish/1000 bait) mackerel horse mackerel squid sardine herring
30 Results Bait selectivity of yellowfin tuna m m m m (no. of fish/1000 bait) mackerel horse mackerel squid sardine herring
31 Summary Sardine and horse mackerel are the efficient bait for bigeye and yellowfin tuna. The order of bait efficiency is not change even the depth difference in both species.
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