Effect of Different Feed Loading on Sediment Accumulation Rate and Carbon Burial Rate in the Polyculture System of Nile Tilapia (Oreochromis niloticus) and Pacific White Shrimp (Litopenaeus vannamei)
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Abstract
A study on the effect of different feed loading on sediment accumulation rate and carbon burial rate in the polyculture of Nile tilapia and Pacific white shrimp was conducted in six ponds located in Phan Thong District, Chonburi Province, in eastern Thailand. The ponds were grouped by level of feed loading: low, moderate and high. The sediment accumulation rate and other parameters were measured at three sites in each pond, one at the feeding area and two at the deep end of the pond. The ponds with high feed loading had the highest mean sediment accumulation rate (35.50±4.71 cm·yr-1), higher than the moderate (16.80±1.86 cm·yr-1) and low (5.40±0.00 cm·yr-1) groups. The group with high feed loading also had the highest mean carbon burial rate (69.87±17.16 g C·m-2·yr-1), significantly higher (p<0.05) than the groups with moderate (17.57±2.59 g C·m-2·yr-1) and low feed loading (6.19±1.23 g C·m-2·yr-1). The results suggest that sediment accumulation rate average exceeds 23.67 cm, the farmer should reduce feeding rate.
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References
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