The impact of net-isolated polyculture of tilapia (<Emphasis Type="Italic">Oreochromis niloticus</Emphasis>) on plankton community in saline–alkaline pond of shrimp (<Emphasis Type="Italic">Penaeus vannamei</Emphasis>) |
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| Authors: | Weiming Sun Shuanglin Dong Zilin Jie Xidan Zhao Hanzhen Zhang Jianxing Li |
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| Institution: | (1) Ocean School, Yantai University, 264005 Yantai, China;(2) The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, 266100 Qingdao, China;(3) The Fishery Technical Extension Center of Dongying, 257000 Dongying, China; |
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| Abstract: | We used 12 land-based experimental enclosures (6 m × 5 m) in a saline–alkaline pond of shrimp (Penaeus vannamei) to determine the impact of net-isolated polyculture of tilapia (Oreochromis niloticus) on plankton communities for 40 days. Tilapias were stocked in net cages suspended in enclosures, in polyculture ponds including
tilapia and shrimp. Four tilapia biomass were tested: 0, 39, 115 and 227 g m−2. Shrimp stocking biomass were 0.7 g m−2 in all treatments. There were three replicates in each treatment. Our results showed that the presence of tilapia significantly
reduced phytoplankton biomass directly through predation and indirectly through top-down effect. The stocking of tilapia reduced
zooplankton biomass, particularly rotifer biomass. However, copepod biomass was not been significantly affected. So, net-isolated
polyculture of tilapia can thus have a strong impact on phytoplankton allowing the co-existence of large numbers of copepods
with planktivorous fish and improving the water quality of shrimp ponds. |
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