Use of mangroves for treatment of wastewater from shrimp aquaculture ponds: Nitrogen and phosphorus budgets under increased area ratio of shrimp ponds

摘要

To assess the capacity of uptake of nitrogen and phosphorus by mangrove Rhizophora mucronata enclosures from shrimp Penaeus rnonodon aquaculture ponds, we car ried out culture experiments at Samut Songkhram, Thailand. The area ratio of the shrimp cul ture pond to the mangrove enclosure was 1:1 in the previous study. Shrimp farmers hope that the area of the mangrove region can be reduced in view of effective economic management. In this study, an experimental area ratio between the shrimp aquaculture ponds and mangrove enclosures of 2:1 was conducted and the effect was evaluated. However, it was shown that the deterioration of the pond sediments could not be prevented in the case that the area ratio be tween the shrimp aquaculture ponds to the mangrove enclosure was 2:1. For sustainable pond usage, the necessity for increasing the area ratio of mangroves to shrimp culture ponds was in dicated based on these results.%エビ養殖地から運ばれた水のマングローブェンクロジャーによる窒素リン吸収能を評価するために，タイで養殖実rn験を行った。経済的な観点からエビ養殖者はマングローブ域の面積が小さくなることを望む。そこでエビ暮殖池とマrnングローブエンクロージャーとの間の面積比が2：1となる実験が行われ，その効果が評価された。しかしながら面積rn比が2:1である場合，地底質の劣化を食い止めることはできなかった。エビ養殖池に対するマングローブ域面積比をrn増加させる必要性が示された。