A Snapshot of the Tropical Tuna Purse Seine Large-Scale Fishing ...

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Table 1. Flag codes used in this paper. The column Economy indicates whether a given flag was treated as a developed economy in this study. Flag Name Economy Flag Name Economy Flag Name Economy ANT Netherlands Antilles Other GRC Greece Developed PAN Panama Other AUS Australia Developed GTM Guatemala Other PHL Philippines Other BLZ Belize Other HRV Croatia Other PNG Papua New Guinea Other CHN China, PR Other IDN Indonesia Other RUS Russian Federation Other CIV Cote d'Ivoire Other IRN Iran Other SLB Solomon Islands Other COL Colombia Other ITA Italy Developed SLV El Salvador Other CPV Cape Verde Other JPN Japan Developed SYC Seychelles Other DZA Algeria Other KIR Kiribati Other SYR Syria Other ECU Ecuador Other KOR Korea Rep. Developed THA Thailand Other EGY Egypt Other LBY Libya Other TUN Tunisia Other ESP Spain Developed MAR Morocco Other TUR Turkey Other FRA France Developed MEX Mexico Other TUV Tuvalu Other FSM Fed. States Micronesia Other MHL Marshall Islands Other TWN Chinese Taipei Developed GBR Great Britain Developed NIC Nicaragua Other USA United States Developed GHA Ghana Other NZL New Zealand Developed VEN Venezuela Other GIN Guinea Other OMN Oman Other VUT Vanuatu Other 3. Results 3.1 Global list of purse seine vessels Merging the RFMO lists, selecting purse seine vessels only, and identifying likely duplicates, resulted in a total of 1,664 vessels. After following steps 3-5 outlined above in Section 2.2, this list contained information as follows: • 83% of the vessels had entries for LOA • 76% of the vessels had entries for GRT • 33% of the vessels had entries for FHV • 19% of the vessels had entries for FCC Therefore, in terms of choosing whether to measure capacity in terms of FHV or FCC, using the former would require fewer extrapolations. The estimation of relationships between different vessel attributes in Section 3.2 is aimed at estimating FHV values for the vessels that do not contain such information. In terms of sizes, the vessels with available data showed a bi-modal distribution (Figure 1), with modes around 22.5 and 62.5 meters LOA. Vessel sizes ranged from 5.4 to 116 meters; the smaller values probably correspond to small coastal purse seiners. 4
Figure 1. Distribution of purse seine vessel sizes (LOA in m) in the RFMO vessel records. 3.2 Relationships between different vessel attributes 3.2.1 GRT vs LOA The relationship between GRT (tonnes) and LOA (m) followed a function of the form (Figure 2): GRT = 0.0186*LOA 2.5987 (n=975, R 2 =0.90) There is considerable variability in the relationship, especially for the larger vessels. Figure 2. Relationship between GRT (tonnes) and LOA (m). 5
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