Journal of Food, Agriculture and Environment

Effects of stocking density of Chinese mitten crab, Eriocheir sinensi, on the zooplankton community in rice-crab culture system

Author(s):

Yan Li ^{1, 2, 3, 4},  Ang Wang ^{1, 3, 4}, Xuzhou Ma ^{1, 3, 4}*, Wu Wang ^{1, 3, 4}, Yunjie Zhang ^{1, 2, 3, 4}, Fei Wang ^{1, 3, 4}

Recieved Date: 2013-07-08, Accepted Date: 2013-09-10

Abstract:

To evaluate the effects on the zooplankton community in rice-crab culture system, we calculated five response variables for the zooplankton community. Crab larvae were stocked at the density of 0 ind m^-2 (CK), 10 ind m^-2 (LD) and 30 ind m^-2 (HD). LD, HD and CK differed little in their species composition: 26 of 38 species were common, and the same five species were dominant. The average density and average biomass of each zooplankton faunal group and their annual trends displayed similar patterns, except the average density of cladocera fauna between HD and CK in September (HD > CK, P < 0.05), and the average biomass of rotifer fauna between HD and CK in September (CK > HD, P < 0.05). The diversity indices calculated for cladocera group revealed significant difference among LD, HD and CK in August (CK > LD, CK > HD, P < 0.05), and for rotifer group in September (LD > CK, HD > CK, P < 0.05). These results suggested that the zooplankton community in rice-crab culture systems was not significantly affected by the stocking density of Chinese mitten crab, but the biomass of zooplankton in LD and HD was higher than CK. Thus, the crab has positive effects on the water purification in this system. The density of crab has no effect on yields of rice and crab, but has a significant effect on the crab size. Considering the profitability and the growing performance of crab in the following year, the low density (10 ind m^-2) is considered reasonable.

Keywords:

Eriocheir sinensis, rice-crab culture, zooplankton community, stocking density, diversity indices

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2123-2127

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