A study of organic carbon,nitrogen and phosphorus budget in jellyfish–shellfish–fish–prawn polyculture ponds |
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Authors: | Kai Guo Wen Zhao Zhiqiang Jiang Shuanglin Dong |
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Affiliation: | 1. Key Laboratory of Hydrobiology in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian, China;2. Ocean University of China, Qingdao, China |
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Abstract: | A budget describing the flow of organic carbon (OC), nitrogen (N) and phosphorus (P) through two polyculture ponds (jellyfish–shellfish–fish–prawn) was constructed. The total input of OC was 3107 kg ha?1 in pond 1 and 3358 kg ha?1 in pond 2, while total output was 1759 kg ha?1 in pond 1 and 1325 kg ha?1 in pond 2. In pond 1, the total input of N was 364 kg ha?1 and output was 359 kg ha?1, whereas, in pond 2, the total input of N was 439 kg ha?1 and total output was 331 kg ha?1. The total input of P was 75 kg ha?1 in pond 1 and 66 kg ha?1 in pond 2, while total outputs for pond 1 and pond 2 were 74 and 65 kg ha?1 respectively. Primary production from phytoplankton contributed the largest proportion of total OC (49–56%), while feed contributed the largest proportion of N (78–81%) and P (79–80%). Animals harvested from the aquaculture ponds accounted for the largest proportion of N (50–73%) and P (49–52%), and respiration accounted for the largest proportion of OC (43–61%) output from the system. The OC, N and P use efficiency of harvested animals was 30.30%, 70.19% and 50.14% in pond 1, respectively, and 21.03%, 46.95% and 46.47% in pond 2 respectively. In terms of nutrient use, the filter‐feeding bivalve, Sinonovacula constricta, was the most efficient species within the polyculture system. |
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Keywords: | polyculture pond nutrient budget organic carbon nitrogen phosphorus |
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