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Fisheries issues of the world ocean

Fisheries issues of the world ocean. Figures, Facts and Factors. Coastal Facts. Coastal area = 20% of land area, but 39% of world population lives within 100 km of it 19% of land within 100 km of coastal areas is altered to urban or agricultural use

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Fisheries issues of the world ocean

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  1. Fisheries issues of the world ocean Figures, Facts and Factors

  2. Coastal Facts • Coastal area = 20% of land area, but 39% of world population lives within 100 km of it • 19% of land within 100 km of coastal areas is altered to urban or agricultural use • 57% of continental shelf of fishing nations is trawled (8.8 million km2) • Relatively small spatial units, often submerged, difficult to assess with coarse-scale global sensors

  3. What’s happening in fish habitat?

  4. Chemical contaminant issues http://www.us-ecosystems.org/coasts_oceans/synthetic_organics/

  5. Global climate change issues • Severe storm events • Increased agricultural runoff • Accelerated eutrophication • Changing thermal niches • Loss of coastal wetlands for spawning • Expanded ranges of non-native organisms

  6. Overfishing “Ecological extinction caused by overfishing precedes all other pervasive human disturbance to coastal ecosystems, includingpollution, degradation of water quality, and anthropogenic climatechange” (J.B.C. Jackson, et al, 2001. Historical overfishing and the collapse of coastal ecosystems. Science293, 5530. 629-637.)

  7. Historical sequence of human disturbances affecting coastal ecosystems Jackson, et al, 2001

  8. What’s happening in fishing?

  9. Food web changes before and after overfishing the historical ecosystems Jackson et al, 2001

  10. A Fishery Story: The Downeaster Alexa • Song by Billy Joel, 1989 • Changes in striped bass commercial fishery • Investigation of contributing factors • Overfishing • Global climate change • Predators, other biotic interactions • Water quality • Disease

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