AquaPark Mid-term meeting - interim results Estimation of carrying capacity Planning and management of aquaculture parks for sustainable development of.

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AquaPark Mid-term meeting - interim results Estimation of carrying capacity Planning and management of aquaculture parks for sustainable development of cage farms in the Philippines

Carrying capacity How much production is sustainable on the long term so that it does not over impact the environment or increase the risk of fish kills? Depends on Level of production Food conversion rate Water exchange rate – flushing AquaPark Mid-term meeting - interim results

Carrying capacity factors Other nutrient inputs Rivers Agricultural run-off Livestock production AquaPark Mid-term meeting - interim results

Modelling carrying capacity 3 important aspects: 1.How severe is the impact – what is the maximum impact underneath cages? 2.How far to the boundary of the impact? (Allowable Zone of Effect) 3.How can husbandry practices be optimised to use the zone most productively? Objectives Predict if impact is SEVERE underneath cages as shown by this deposition footprint Zone colour Predict distance to boundary of MODERATE impact Zone colour Edge of Park

AquaPark Mid-term meeting - interim results

TROPOMOD predicted flux (deposition) of waste feed and faeces for Panabo The colours show different amounts of flux Sediment trap transects: Grouper (traps are in 6 m depth) Milkfish transect (traps are in 27 m depth) Reference traps Model predictions - Panabo Higher flux and predicted impact in the inshore areas

Modelling currents

Nutrient build up in an aquaculture zone Residence time Refreshment Nutrient levels Eutrophic High residence time,low flushing Low residence time, high flushing

Modelling currents Model of currents in Bolinao AquaPark Mid-term meeting - interim results

Bathymetry AquaPark Mid-term meeting - interim results

Factors affecting carrying capacity Fish density AquaPark Mid-term meeting - interim results

Factors affecting carrying capacity Cage spacing AquaPark Mid-term meeting - interim results

Other factors Good site selection Water depth Extractive species AquaPark Mid-term meeting - interim results