Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8494201 | Aquaculture | 2016 | 39 Pages |
Abstract
The budget of organic carbon (OC) in polyculture systems of swimming crab Portunus trituberculatus, white shrimp Litopenaeus vannamei and short-necked clam Ruditapes philippinarum was studied with land-based enclosures from July 2 to October 3, 2012. Six treatments were designed, including monoculture of crab (C), polyculture of crab with shrimp (CS) and polyculture of crab with shrimp and clam (CSB1, CSB2, CSB3 and CSB4). Crab were stocked at 6Â ind/m2 in all treatments, and shrimp were stocked at 45Â ind/m2. Short-necked clam were stocked with crab and shrimp in four different densities, i.e., 7.5 (CSB1), 15 (CSB2), 30 (CSB3) and 60Â ind/m2 (CSB4). Results showed that the yield of crab was the highest in CSB4 system (PÂ <Â 0.05), while the survival rate and yield of white shrimp were highest in CSB3 system (PÂ <Â 0.05). The short-necked clam in CSB4 system exhibited the best yield (PÂ <Â 0.05). Primary production of phytoplankton and periphyton was the main input of OC, accounting for 46.08%-74.34%, and the feed provided 21.50%-51.40% of the total input. The major output of OC was biological and sediment respiration followed by accumulation in sediment, which accounted for 59.39%-68.61% and 21.86%-28.49%, respectively, of the total output. Accumulation of OC in the sediment of CSB1, CSB3 and CSB4 was significantly lower than the other systems (PÂ <Â 0.05). The CSB3 showed the highest efficiency of OC utilization and followed by the CSB4 (PÂ <Â 0.05). In conclusion, the optimum stocking density for the tri-species polyculture systems in this study was crab at 6Â ind/m2, shrimp at 45Â ind/m2, and short-necked clam at 30-60Â ind/m2, which exhibited better ecological efficiency and economic benefit.
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Authors
Kai Zhang, Xiang-li Tian, Shuang-lin Dong, Jie Feng, Rui-peng He,