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XU Qiang, GAO Fei, YANG Hongsheng. Importance of kelp-derived organic carbon to the scallop Chlamys farreri in an integrated multi-trophic aquaculture system[J]. Journal of Oceanology and Limnology, 2016, 34(2): 322-329

Importance of kelp-derived organic carbon to the scallop Chlamys farreri in an integrated multi-trophic aquaculture system

XU Qiang1, GAO Fei2, YANG Hongsheng1
1 Key Laboratory of Marine Ecology and Environmental Sciences;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China
Bivalves and seaweeds are important cleaners that are widely used in integrated multi-trophic aquaculture(IMTA) systems. A beneficial relationship between seaweed and bivalve in the seaweedbased IMTA system has been confi rmed, but the trophic importance of seaweed-derived particulate organic materials to the co-cultured bivalve is still unclear. We evaluated the trophic importance of the kelp Saccharina japonica to the co-cultured scallop Chlamys farreri in a typical IMTA farm in Sungo Bay(Weihai, North China). The dynamics of detritus carbon in the water were monitored during the culturing period. The proportion of kelp-derived organic matter in the diet of the co-cultured scallop was assessed via the stable carbon isotope method. Results showed that the detritus carbon in the water ranged from 75.52 to 265.19μg/L, which was 25.6% to 73.8% of total particulate organic carbon(TPOC) during the study period. The amount of detritus carbon and its proportion in the TPOC changed throughout the culture cycle of the kelp. Stable carbon isotope analysis showed that the cultured scallop obtained 14.1% to 42.8% of its tissue carbon from the kelp, and that the percentages were closely correlated with the proportion of detritus carbon in the water(F=0.993, P=0.003). Evaluation showed that for 17000 tons(wet weight) of annual scallop production, the kelp contributed about 139.3 tons of carbon(535.8 tons of dry mass). This confirms that cultured kelp plays a similar trophic role in IMTA systems as it does in a natural kelp bed. It is a major contributor to the detritus pool and supplies a vital food source to filter-feeding scallops in the IMTA system, especially during winter and early spring when phytoplankton are scarce.
Key words:    integrated multi-trophic aquaculture(IMTA)|kelp|bivalve|detritus|food source|stable carbon isotope   
Received: 2014-12-05   Revised: 2015-03-27
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