Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000
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International Symposium on marine fisheries, ecosystems and societies in West Africa: Half a century of change Dakar, 26-28 June 2002. Chronicles of catches from marine fisheries in the Eastern Central Atlantic for 1950-2000. Luca Garibaldi and Richard Grainger

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Chronicles of catches from marine fisheries in the Eastern Central Atlantic for 1950-2000

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Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

International Symposium on marine fisheries, ecosystems and societies in West Africa: Half a century of change

Dakar, 26-28 June 2002

Chronicles of catches from marine fisheries in the Eastern Central Atlantic for 1950-2000

Luca Garibaldi and Richard Grainger

Fishery Information, Data and Statistics Unit

FAO


1 catch statistics collected by fao fidi in the eastern central atlantic cecaf area

1. Catch statistics collected by FAO-FIDI in the Eastern Central Atlantic-CECAF area

The CECAF area and its divisions

CodeName

34.1.1 Morocco coastal

34.1.2Canaries/Madeira insular

34.1.3Sahara coastal

34.1.9Northern coastal, not known

34.2.0Northern oceanic

34.3.1Cape Verde coastal

34.3.2Cape Verde insular

34.3.3Sherbro

34.3.4Western Gulf of Guinea

34.3.5Central Gulf of Guinea

34.3.6Southern Gulf of Guinea

34.4.1Southwest Gulf of Guinea

34.4.2Southwest oceanic

34.9.0Not known (CECAF area)

34.0.0Tunas (CECAF area)

http://www.fao.org/fi/statist/fisoft/FISHPLUS.asp


The revised isscaap groups

The revised ISSCAAP groups

  • 'International Standard Statistical Classification for Aquatic Animals and Plants' (ISSCAAP) defines 50 groups of species.

  • ISSCAAP groups have been recently revised

    • a new useful grouping for coastal fishes

    • better identification of demersal and pelagic species

  • For the first time, aggregations of data by the new ISSCAAP groups are discussed


2 overview of the 2000 catches respect to the previous year

2. Overview of the 2000 catches respect to the previous year

  • Total catches for 2000 in Eastern Central Atlantic about 3,500,000 tonnes, a slight reduction from 1999

  • Among the 10 major fishing countries in the area

    • Netherlands and Morocco increased

    • Spain and Russian Federation showed significant decreases

  • Totals by the new ISSCAAP groups reveal:

    • increase of small pelagic catches (mainly mackerels)

    • decrease of coastal and demersal fish catches

    • catches of valuable species such as tunas, crustaceans and cephalopods decreased


3 characterization of the cecaf divisions by isscaap groups catches

3. Characterization of the CECAF divisions by ISSCAAP groups' catches

  • Catch statistics for the 1970-2000 period of the seven coastal CECAF divisions have been plotted by the ISSCAAP groups

  • Average percentage accounted for by "Marine fishes not identified" for each coastal division are as follows:

    CodeDivision namePercentage

    34.1.1Morocco coastal 7.6%

    34.1.3Sahara coastal 7.5%

    34.3.1Cape Verde coastal 10.1%

    34.3.3Sherbro 7.5%

    34.3.4Western Gulf of Guinea 10.9%

    34.3.5Central Gulf of Guinea 15.2%

    34.3.6Southern Gulf of Guinea 15.6%


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Division 1.1 - Morocco coastal

Clupeoids and other pelagic fishes dominate catches in the two northern coastal divisions. Significant catches of molluscs, mainly cephalopods.

Division 1.3 - Sahara coastal


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Division 3.1 - Cape verde coastal

Division 3.3 - Sherbro

Catch trends in three central divisions are still influenced by the fluctuations of clupeoids but coastal and demersal fishes begin to have a greater importance.

Division 3.4 - Western Gulf of Guinea


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Division 3.5 - Central Gulf of Guinea

In two remaining coastal divisions, all the groups of species are fairly well represented. Maybe this is a sign of more varied and stable marine ecosystems, which have supported a more steady rise of catches throughout the last 30 years, although the distribution and abundance of important fishery resources have varied (Koranteng,1999).

Division 3.6 - Southern Gulf of Guinea


4 historical trends of distant water fleets catches

4. Historical trends of Distant Water Fleets catches

Total catches by DWFs

Share of DWFs catches on total catches


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Major DWF countries and groups of countries


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

DWFs' catches by ISSCAAP group

Share of DWFs catches on total catches by ISSCAAP group


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Clupeoids + miscellaneous pelagic fishes

Tunas


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

DWFs' catches by major CECAF divisions

Share of DWFs catches on total catchesof major CECAF divisions


5 development of fisheries and the state of marine resources

5. Development of fisheries and the state of marine resources

  • Development of fisheries on the main resources in the Eastern Central Atlantic since 1950 chronicled

  • Top 38 species items analysed (account for 75% of marine capture production)

  • Using cluster analysis, time series grouped according to their shapes into five groups


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

  • Species of Cluster 1, which dominate the catches, include several pelagic species

  • Species in Cluster 2, many of them subject of distant water fishing fleets

  • Cluster 3 includes mostly coastal species with limited catches which showed a rapid decline in the 1970s and have not recovered.

  • Fisheries for the pelagic species of Cluster 4, which were probably strongly regime-influenced

  • Species of Cluster 5 dominated by sardinellas and bigeye tuna


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Percentage of major marine fish resources in various phases of fishery development

  • Simple fishery development model assumed comprising four phases

    • Phase 1: Undeveloped

    • Phase 2: Developing

    • Phase 3: Mature

    • Phase 4: Senescent (declining)

  • Time series classified to phase according to slope of the line for 3-year average catches


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Percentage of major marine fish resources in various phases of fishery development (contd.)

  • The total number (and percentage) of resources in each phase were calculated each year, across the whole data set.


Conclusions

Conclusions

  • Analysis demonstrates strikingly the development of fisheries

    • 90% of the resources were classified as “undeveloped” in 1950s

    • 68% of them were either “mature” or senescent” in 1990s

  • Very little room for further expansion of harvest from these fish stocks

  • Increase in resources which are subject to declines in productivity (“senescent” or Phase IV)

  • Consistent with analysis by Grainger and Garcia (1996) which indicated the Eastern Central Atlantic was fully fished in 1980s and estimated maximum production region can provide is 4.3 million tonnes.


Chronicles of catches from marine fisheries in the eastern central atlantic for 1950 2000

Thank you for your kind attention


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