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ENVIRONMENTAL VARIABILITY IN THE SOUTH EASTERN PACIFIC OCEAN OFF CHILE

ENVIRONMENTAL VARIABILITY IN THE SOUTH EASTERN PACIFIC OCEAN OFF CHILE. Central South Fisheries. 30°S. Central South Fisheries. 42°S. Space. Large scale forcing. Inter-decadal regime. Ocean. ENSO strength and duration. Stock condition before ENSO. Basin. Fishery pressure.

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ENVIRONMENTAL VARIABILITY IN THE SOUTH EASTERN PACIFIC OCEAN OFF CHILE

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  1. ENVIRONMENTAL VARIABILITY IN THE SOUTH EASTERN PACIFIC OCEAN OFF CHILE Central South Fisheries

  2. 30°S Central South Fisheries 42°S

  3. Space Large scale forcing Inter-decadal regime Ocean ENSO strength and duration Stock conditionbefore ENSO Basin Fishery pressure Small scale forcing Regional Adapted reproduction Local Upwelling Local Time Day Month Season Year Decade Inter-annual

  4. Mode of climate variability in the Pacific Ocean Mantua et al. 1997. Bull.Amer.Soc.78:1069-1079. LARGE SCALE FORCING

  5. REGIME SHIFT Test de Ebbesmeyer et al. Hare y Mantua. 2000. Prog. Oceanogr. 47:103-146

  6. CHILEAN FISHERIES STATISTICS ? 97- 98 Jack Mackerel 4500 Anchovy Sardine 4000 Hake 3500 ? 3000 82- 83 2500 ? 3 2000 72 - 73 Landings (10 ton) 1500 1000 500 0 1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001 YEAR RS RS

  7. ¿What are the requirements?

  8. We need to manage basic population information, in order to predict changes in fish population stock. Therefore we need environmental data (long time series) to be included in stock assessment model. • ACTUAL WORK • OBJECTIVES: • RETROSPECTIVE ANALYSIS: Identify pattern of environmental variability at diferents SCALES (time – space) and its possible relation with fish populations abundance fluctuations. • Identify existing methodology . • To maintain a long term monitoring program in the area, which allow us to understand the consistency and strength of the detected relationship. • To identify new areas of interest that need additional research effort. The first action is to identify the relationship between the environmental fluctuations with the annual recruitment changes, seeking to manage short term tools for predictions.

  9. CASE OF STUDY 1.- Jack Mackarel 2.- Common Merluccius 3.- Hoki 4.- Common sardine

  10. 3 0 3 0 3 1 3 1 3 2 3 2 3 3 3 3 3 4 3 4 Topocalma 3 5 D 3 5 U Constitucion T 3 6 I Pta.Nugurne 3 6 T A Talcahuano 3 7 L 3 7 Pto.Lebu 3 8 3 8 Pto.Saavedra 3 9 3 9 Corral 4 0 4 0 4 1 4 1 4 2 4 2 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 LONGITUD J. Mackarel Fish Ground Jack Mackarel spawning area Sardine fishing ground

  11. Common Sardine and Anchovy TSM monthly average anomaly for period 1982-2003 for the coastal area of Central Chile 30°-40°S

  12. SST Monthly Anomaly Jack Mackarel Spawning area Period: 1982 - 2003. Sector: 80°-90°W, 30°-40°S)

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