Mangroves and shrimp pond culture effluents in Aklan, Panay is., central Philippines

  • Primavera J
  • Altamirano J
  • Lebata M
 et al. 
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The capacity of a natural mangrove system in Ibajay, Aklan province,
central Philippines to process shrimp pond culture effluents was
assessed through analysis of mangrove community structure and 24-hr
monitoring of water quality parameters (NH3-N, NO3-N, PO4-P sulfide, and
total suspended solids). Results from the latter showed decreased
nutrient levels within 6 hrs after daytime draining of effluents into
the mangrove stand, but only nitrate reduction was statistically
significant. Based on nitrate loss, volume of water drained, mangrove
area, and shrimp farming data (e.g., N loss from ponds, feed
composition, feeding rate), calculations show that 1.8-5.4 ha of
mangroves are required to remove nitrate wastes from I ha of shrimp
pond. N uptake by the mangrove macroflora was supported by data showing
longer nipa palm leaflets and faster mangrove seedling growth in the
experimental mangrove receiving effluents compared to a control
mangrove, but not from mangrove biomass measurements. These results have
significant implications for the Philippine brackishwater pond culture
industry to conserve or rehabilitate mangroves as potential pond
biofilters, to implement legally mandated 20- and 50-m greenbelts, and
to reverse the national 0.5 ha mangrove: 1.0 ha pond ratio.

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