Fish farms at Sea

The ground truth from Google Earth

Pablo Trujillo, Chiara Piroddi, Jennifer Jacquet

    Research output: Contribution to journalArticle

    Abstract

    In the face of global overfishing of wild-caught seafood, ocean fish farming has augmented the supply of fresh fish to western markets and become one of the fastest growing global industries. Accurate reporting of quantities of wild-caught fish has been problematic and we questioned whether similar discrepancies in data exist in statistics for farmed fish production. In the Mediterranean Sea, ocean fish farming is prevalent and stationary cages can be seen off the coasts of 16 countries using satellite imagery available through Google Earth. Using this tool, we demonstrate here that a few trained scientists now have the capacity to ground truth farmed fish production data reported by the Mediterranean countries. With Google Earth, we could examine 91% of the Mediterranean coast and count 248 tuna cages (circular cages >40 m diameter) and 20,976 other fish cages within 10 km offshore, the majority of which were off Greece (49%) and Turkey (31%). Combining satellite imagery with assumptions about cage volume, fish density, harvest rates, and seasonal capacity, we make a conservative approximation of ocean-farmed finfish production for 16 Mediterranean countries. Our overall estimate of 225,736 t of farmed finfish (not including tuna) in the Mediterranean Sea in 2006 is only slightly more than the United Nations Food and Agriculture Organization reports. The results demonstrate the reliability of recent FAO farmed fish production statistics for the Mediterranean as well as the promise of Google Earth to collect and ground truth data.

    Original languageEnglish (US)
    Article numbere30546
    JournalPLoS One
    Volume7
    Issue number2
    DOIs
    StatePublished - Feb 8 2012

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    Fisheries
    fish farms
    Oceans and Seas
    Fish
    Farms
    Fishes
    Earth (planet)
    farmed fish
    fish production
    cages
    fish
    oceans
    tuna
    fish culture
    Mediterranean region
    Mediterranean Sea
    Satellite Imagery
    Agriculture
    statistics
    Tuna

    ASJC Scopus subject areas

    • Medicine(all)
    • Biochemistry, Genetics and Molecular Biology(all)
    • Agricultural and Biological Sciences(all)

    Cite this

    Fish farms at Sea : The ground truth from Google Earth. / Trujillo, Pablo; Piroddi, Chiara; Jacquet, Jennifer.

    In: PLoS One, Vol. 7, No. 2, e30546, 08.02.2012.

    Research output: Contribution to journalArticle

    Trujillo, P, Piroddi, C & Jacquet, J 2012, 'Fish farms at Sea: The ground truth from Google Earth', PLoS One, vol. 7, no. 2, e30546. https://doi.org/10.1371/journal.pone.0030546
    Trujillo, Pablo ; Piroddi, Chiara ; Jacquet, Jennifer. / Fish farms at Sea : The ground truth from Google Earth. In: PLoS One. 2012 ; Vol. 7, No. 2.
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