MONITORING POND ACTIVITY USING VHSR IMAGES: CASE STUDY PERANCAK ESTUARY, BALI, INDONESIA

Niken Gusmawati*, Benoît Soulard, Nazha Selmaoui-Folcher, Christophe Proisy, Akhmad Mustafa, Romain Le Gendre, Thierry Laugier, Hugues Lemonnier

Pôle Pluridisciplinaire et Matière de l'Environnement (PPME)
University of New Caledonia
Campus de Nouvile, BP R4, Nouméa CEDEX, New Caledonia 98851

From the 1980's, Indonesian shrimp production has continuously increased through a large expansion of cultured areas and an intensification of the production. As consequences of disease and environmental degradations linked to this development, there are currently 250,000 ha of abandoned shrimp ponds in Indonesia representing 37% of the total pond surface. To implement effective procedures to undertake appropriate aquaculture ecosystem assessment and monitoring, an indicator has been developed to discriminate between active and abandoned ponds. It is based on very high spatial optical satellite images.

To test this tool, shrimp aquaculture history of the Perancak estuary, Bali, Indonesia a production area in decline, has been analyzed between 2001 and 2015. This study highlights two risk factors that could contribute to explain dynamics of abandonment: (i) climate conditions and (ii) geographical positioning of ponds within the estuary, suggesting that a spatial approach should be integrated in our future thinking to operationalize pond rehabilitation.

Keywords: Aquaculture; abandoned ponds; VHR images; indicator; supervised classification; spatial and temporal survey