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GEO Year Book 2003  
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Fishing down the food chain

The arrow indicates how, over time, humans have depleted stocks of larger fish found closer to the
surface and are now fishing smaller fish from deeper water or on the bottom of the sea. When fish are
taken from the bottom the habitat usually changes from one rich in various plants and bottom-dwelling
organisms, to a near-lifeless muddy substrate.

Source: Daniel Pauly, Fisheries Centre, University of British Columbia, Canada

 

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