ENVIRONMENTAL VARIABILITY IN THE SOUTH EASTERN PACIFIC OCEAN OFF CHILE
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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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30°S OFF CHILE

Central South Fisheries

42°S


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Space OFF CHILE

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


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Mode of climate variability in the Pacific Ocean OFF CHILE

Mantua et al. 1997. Bull.Amer.Soc.78:1069-1079.

LARGE SCALE FORCING


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REGIME SHIFT OFF CHILE

Test de Ebbesmeyer et al.

Hare y Mantua. 2000. Prog. Oceanogr. 47:103-146


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CHILEAN FISHERIES STATISTICS OFF CHILE

?

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



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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.


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CASE OF STUDY

1.- Jack Mackarel

2.- Common Merluccius

3.- Hoki

4.- Common sardine


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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


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Common Sardine and Anchovy

TSM monthly average anomaly for period 1982-2003 for the coastal area of Central Chile 30°-40°S


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SST Monthly Anomaly

Jack Mackarel Spawning area

Period: 1982 - 2003. Sector: 80°-90°W, 30°-40°S)


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