IATTC Fishery Status Report 8 - ComisiÃƒÂ³n Interamericana del AtÃƒÂºn ...

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146 TABLE J-2. Preliminary productivity attributes and proposed scoring thresholds used in the <strong>IATTC</strong> PSA. TABLA J-2. Atributos de productividad preliminares y umbrales de puntuación propuestos usados en el PSA de la CIAT. Productivity attribute Ranking – Clasificación Atributo de productividad Low – Bajo (1) Moderate – Moderado (2) High – Alto (3) Intrinsic rate of population growth (r) Tasa intrínseca de crecimiento de la población (r) > 1.3 > 0.1, ≤ 1.3 ≤ 0.1 Maximum age (years) Edad máxima (años) ≥ 20 > 11, < 20 ≤ 11 Maximum size (cm) Talla máxima (cm) > 350 > 200, ≤ 350 ≤ 200 von Bertalanffy growth coefficient (k) Coeficiente de crecimiento de von Bertalanffy (k) < 0.095 0.095 – 0.21 > 0.21 Natural mortality (M) Mortalidad natural (M) < 0.25 0.25 – 0.48 > 0.48 Fecundity (measured) Fecundidad (medida) > 200,000 10 – 200,000 < 10 Breeding strategy Estrategia de reproducción ≥ 4 1 to-a 3 0 Age at maturity (years) Edad de madurez (años) ≥ 7.0 ≥ 2.7, < 7.0 < 2.7 Mean trophic level Nivel trófico medio > 5.1 4.5 – 5.1 < 4.5
147 TABLE J-3. Preliminary susceptibility attributes and proposed scoring thresholds used in the <strong>IATTC</strong> PSA. Susceptibility attribute Management strategy Areal overlap - geographical concentration index Vertical overlap with gear Seasonal migrations Schooling/Aggregation and other behavioral responses to gear Potential survival after capture and release under current fishing practices Desirability/value of catch (percent retention) Catch trends Ranking Low (1) Moderate (2) High (3) Stocks specifically named in conservation resolutions; closely monitored Management and proactive accountability measures in place Greatest bycatches outside areas with the most sets and stock not concentrated (or not rare) < 25% of stock occurs at the depths fished Seasonal migrations decrease overlap with the fishery Behavioral responses decrease the catchability of the gear Probability of survival > 67% Stock is not highly valued or desired by the fishery (< 33% retention) Catch-per-set increased over time Greatest bycatches outside areas with the most sets and stock concentrated (or rare), OR Greatest bycatches in areas with the most sets and stock not concentrated (or not rare) Between 25% and 50% of the stock occurs at the depths fished Seasonal migrations do not substantially affect the overlap with the fishery Behavioral responses do not substantially affect the catchability of the gear 33% < probability of survival ≤ 67% Stock is moderately valued or desired by the fishery (33-66% retention) No Catch-per-set trend over time No management measures; stocks closely monitored Greatest bycatches in areas with the most sets and stock concentrated (or rare) > 50% of the stock occurs in the depths fished Seasonal migrations increase overlap with the fishery Behavioral responses increase the catchability of the gear Probability of survival < 33% Stock is highly valued or desired by the fishery (> 66% retention) Catch-per-set decreased over time
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COVER PHOTOGRAPH BY WAYNE PERRYMAN
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3 FISHERY STATUS REPORT 8 TUNAS AND
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5 INFORME DE LA SITUACIÓN DE LA PE
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7 A. THE FISHERY FOR TUNAS AND BILL
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9 1.1.3. Bigeye tuna The annual cat
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11 1.3. Size compositions of the ca
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13 associated with dolphins and the
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15 FIGURE A-1a. Average annual dist
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17 FIGURE A-3a. Average annual dist
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FIGURE A-5. The fisheries defined b
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FIGURE A-6b. Estimated size composi
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FIGURE A-10. Estimated size composi
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29 TABLE A-1. Annual catches of yel
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31 TABLE A-2a. (continued) TABLA A-
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33 TABLE A-2b. Estimated retained c
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35 TABLE A-2c. Estimated retained c
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37 TABLE A-3b. Annual catches of ye
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39 TABLE A-3d. Catches of bigeye tu
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41 TABLE A-4. Preliminary estimates
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43 TABLE A-6a. Annual retained catc
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TABLE A-7. Estimated numbers of set
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47 TABLE A-8. Types of floating obj
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49 TABLE A-10. Numbers and well vol
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51 TABLE A-11b. Estimates of the nu
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53 A. LA PESQUERÍA DE ATUNES Y PEC
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55 toneladas, ocurrió en 2007, y l
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57 2004-2008, con capturas ligerame
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59 muestreo de especies y composici
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61 VEM calculadas semanalmente por
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63 management is based on the base
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FIGURE B-2. Average annual fishing
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FIGURE B-4. Spawning biomass ratios
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FIGURE B-6. Yield and spawning biom
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FIGURE B-8. Historic and projected
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73 B. ATÚN ALETA AMARILLA En esta
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C. SKIPJACK TUNA An age-structured
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FIGURE C-2. Indicators of the stock
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D. BIGEYE TUNA This section present
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this interpretation is subject to u
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FIGURE D-3. Average annual fishing
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FIGURE D-5. Trajectory of the spawn
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FIGURE D-7. Catches for 1975-2008,
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FIGURE D-9. Phase plot of the time
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91 D. ATÚN PATUDO En esta sección
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93 medida que disminuye la abundanc
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Page 99 and 100: FIGURE E-2. Estimates of the impact
Page 101 and 102: E. ATÚN ALETA AZUL DEL PACÍFICO L
Page 103 and 104: 101 F. ALBACORE TUNA There are two
Page 105 and 106: 103 300 000 250 000 200 000 t 150 0
Page 107 and 108: 105 comparó su estimación para el
Page 109 and 110: FIGURE G-1. Retained catches of swo
Page 111 and 112: 109 H. BLUE MARLIN The best informa
Page 113 and 114: 111 H. MARLÍN AZUL La mejor inform
Page 115 and 116: patterns of areas fished and change
Page 117 and 118: 115 FIGURE I-2. Landings of striped
Page 119 and 120: FIGURE I-5. Annual fishing mortalit
Page 121 and 122: FIGURE I-7. Estimated spawning biom
Page 123 and 124: I. MARLÍN RAYADO Esta sección pre
Page 125 and 126: 7. El multiplicador de mortalidad p
Page 127 and 128: 2.2. Tunas Information on the effec
Page 129 and 130: 127 Set type OBJ NOA DEL Total Oliv
Page 131 and 132: Population status and trends are cu
Page 133 and 134: isotopic composition of the base of
Page 135 and 136: groups, and the herbivorous micro-z
Page 137 and 138: ecosystem components. Ecosystem mod
Page 139 and 140: to reduce bycatches. c. Information
Page 141 and 142: FIGURE J-4. Trophic level estimates
Page 143 and 144: FIGURE J-5. Productivity and suscep
Page 145 and 146: FIGURE J-7. Productivity and suscep
Page 147: 145 TABLA J-1. Especies objetivo y
Page 151 and 152: 149 J. CONSIDERACIONES ECOSISTÉMIC
Page 153 and 154: 151 alimentación y en la posición
Page 155 and 156: 153 estudios de la estructura de la
Page 157 and 158: 155 datos sobre la distribución y
Page 159 and 160: 157 presas ejercen una presión de
Page 161 and 162: 159 piscívoros grandes, delfines (
Page 163 and 164: 161 puntuaciones de susceptibilidad
Page 165: 163 resultante de las actividades d
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IATTC Fishery Status Report 8 - ComisiÃƒÂ³n Interamericana del AtÃƒÂºn ...

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