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14Figure 2. Carrying capacity, in cubic meters of well volume, of the purse-seineand pole-and-line fleets in the EPO, 1961-2008purse-seine vessels increased from 125 to 218, andtheir total well volume from about 32 thousand toabout 225 thousand m 3 , an average of about 1,000m 3 per vessel. An earlier peak in numbers and totalwell volume of purse seiners occurred from themid-1970s to the early 1980s, when the number ofvessels reached 282 and the total well volumeabout 195 thousand m 3 , an average of about 700m 3 per vessel (Table A-10; Figure 2).The catch rates in the EPO were low during 1978-1981, due to concentration of fishing effort onsmall fish, and the situation was exacerbated by amajor El Niño event, which began in mid-1982 andpersisted until late 1983 and made the fish lessvulnerable to capture. The total well volume ofpurse-seine and pole-and-line vessels then declinedas vessels were deactivated or left the EPO to fishin other areas, primarily the western Pacific Ocean, and in 1984 it reached its lowest level since 1971, about 122 thousand m 3 . Inearly 1990 the U.S. tuna-canning industry adopted a policy of not purchasing tunas caught during trips during which sets on tunasassociated with dolphins were made. This caused many U.S.-flag vessels to leave the EPO, with a consequent reduction in the fleetto about 117 thousand m 3 in 1992. With increases in participation of vessels of other nations in the fishery, the total well volume hasincreased steadily since 1992, and in 2008 was 225 thousand m 3 .The 2007 and preliminary 2008 data for numbers and total well volumes of purse-seine and pole-and-line vessels that fished fortunas in the EPO are shown in Tables A-11a and A-11b. During 2008, the fleet was dominated by vessels operating under the Ecuadorianand Mexican flags, with about 27% and 24%, respectively, of the total well volume; they were followed by Panama (16%),Venezuela (13%), Colombia (7%), Spain (5%), El Salvador, and Nicaragua, (3% each), and Vanuatu (2%).The cumulative capacity at sea during 2008 is compared to those of the previous five years in Figure 3.The monthly average, minimum, and maximum total well volumes at sea (VAS), in thousands of cubic meters, of purse-seineand pole-and-line vessels that fished for tunas in the EPO during 1998-2007, and the 2008 values, are shown in Table A-12. Themonthly values are averages of the VAS estimated at weekly intervals by the IATTC staff. The fishery was regulated duringsome or all of the last four months of 1998-2008, so the VAS values for September-December 2008 are not comparable to theaverage VAS values for those months of 1998-2007. The average VAS values for 1998-2007and 2008 were 122 thousand m 3 (61% of totalcapacity) and 135 thousand m 3 (60% of totalcapacity), respectively.3.2. Other fleets of the EPOInformation on other types of vessels that fish fortunas in the EPO is available on the IATTC’sRegional Vessel Register, on the IATTC website. The Register is incomplete for small vessels.In some cases, particularly for large longlinevessels, the Register contains information forvessels authorized to fish not only in the EPO,but also in other oceans, and which may not havefished in the EPO during 2008, or ever.Figure 3. Cumulative capacity of the purse-seine and pole-and-line fleet at sea,by month, 2003-2008
15FIGURE A-1a. Average annual distributions of the purse-seine catches of yellowfin, by set type, 1998-2007. The sizes of thecircles are proportional to the amounts of yellowfin caught in those 5° by 5° areas.FIGURA A-1a. Distribución media anual de las capturas cerqueras de aleta amarilla, por tipo de lance, 1998-2007. El tamaño decada círculo es proporcional a la cantidad de aleta amarilla capturado en la cuadrícula de 5° x 5° correspondiente.FIGURE A-1b. Annual distributions of the purse-seine catches of yellowfin, by set type, 2008. The sizes of the circles areproportional to the amounts of yellowfin caught in those 5° by 5° areas.FIGURA A-1b. Distribución anual de las capturas cerqueras de aleta amarilla, por tipo de lance, 2008. El tamaño de cada círculo esproporcional a la cantidad de aleta amarilla capturado en la cuadrícula de 5° x 5° correspondiente.
Page 2 and 3: COVER PHOTOGRAPH BY WAYNE PERRYMANF
Page 5 and 6: 3FISHERY STATUS REPORT 7TUNAS AND B
Page 7 and 8: 5INFORME DE LA SITUACIÓN DE LA PES
Page 9: 7A. THE FISHERY FOR TUNAS AND BILLF
Page 12 and 13: 10fisheries, and have been reported
Page 14 and 15: 12line vessels.The estimated size c
Page 18 and 19: 16FIGURE A-2a. Average annual distr
Page 20 and 21: 18.FIGURE A-4. Distributions of the
Page 22 and 23: 20FIGURE A-6a. Estimated size compo
Page 28 and 29: 26FIGURE A-9. Estimated catches of
Page 30 and 31: 28FIGURE A-11. Estimated size compo
Page 32 and 33: 30TABLE A-2a. Estimated retained ca
Page 34 and 35: 32TABLE A-2a. (continued)TABLA A-2a
Page 36 and 37: 34TABLE A-2b. (continued)TABLA A-2b
Page 38 and 39: 36TABLE A-3a. Catches of yellowfin
Page 40 and 41: 381TABLE A-3c. Catches of skipjack
Page 42 and 43: 40TABLE A-3e. Annual catches of big
Page 44 and 45: 42TABLE A-4b. Preliminary estimates
Page 46 and 47: 44TABLE A-6a. Annual retained catch
Page 48 and 49: 46TABLE A-7. Estimated numbers of s
Page 50 and 51: 48TABLE A-8. Types of floating obje
Page 52 and 53: 50TABLE A-10. Numbers and well volu
Page 54 and 55: 52TABLE A-11b. Estimates of the num
Page 56 and 57: 54A. LA PESQUERÍA DE ATUNES Y PECE
Page 58 and 59: 56En la Tabla A-2a se presentan las
Page 60 and 61: 581.3. Composición por tamaño de
Page 62 and 63: 601.5. Descargas de atunes y bonito
Page 64 and 65: 62bodega en el mar (VEM), en miles
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64when the true dynamics includes a
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66FIGURE B-2. Estimated recruitment
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68FIGURE B-4. Spawning biomass traj
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70FIGURE B-6. Catches of yellowfin
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72FIGURE B-8. Phase plot of the tim
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74TABLE B-1. Estimates of the MSY o
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76Es importante señalar que la cur
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78FIGURE C-1. Total catches (retain
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80C. ATÚN BARRILETESe ha usado un
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82fishing mortality are expected to
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84FIGURE D-3. Average annual fishin
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86FIGURE D-5. Trajectory of the spa
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88FIGURE D-7. Catches for 1975-2008
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90FIGURE D-9. Phase plot of the tim
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92D. ATÚN PATUDOEn la presente eva
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946. Los resultados son más pesimi
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96FIGURE E-1. Retained catches of P
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98F. ALBACORE TUNAThere are two sto
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100300 000250 000200 000t150 000100
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102fue aproximadamente 0.75, nivel
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104FIGURE G-1. Retained catches of
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106H. BLUE MARLINThe best knowledge
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108H. MARLÍN AZULLa mejor informac
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110FIGURE I-1. Retained catches of
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112J. ECOSYSTEM CONSIDERATIONS1. In
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114have been identified (by presenc
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116Some marine mammals are adversel
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118tors of stress, and removing liv
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120Knowledge of the trophic ecology
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1226. AGGREGATE INDICATORSRecogniti
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124b. The incidental mortalities of
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126FIGURE J-1. Simplified food-web
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128FIGURE J-4. Trophic level estima
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130cual no es incluida en los anál
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132Especie y poblaciónMortalidad i
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1342.7. Tiburones y otros peces gra
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136condición de la población del
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1387‰ con respecto a la línea de
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140entre índices de asociación de
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142b. En junio de 2003, la CIAT ado
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