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| Effects of Effective Microorganisms on Red Swamp Crayfish Procambarus clarkii Juveniles in Spartina alterniflora Litter Bottom Matrix |
| ZHANG Jingyi1, JIANG Renping1, MENG Xianglong2, HUANG Cheng1, LIU Maosong1 |
1. College of Life Sciences, Nanjing University, Nanjing 210023, China;
2. Jiangsu Institute of Freshwater Fisheries, Nanjing 210017, China |
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Abstract To evaluate the impact of Spartina alterniflora litter in bottom matrix on mudflat benthos and the adaptive management of resource utilization, the matrix properties and 30 days survival and growth were investigated in 4 microhabitats [S. alterniflora with effective microorganisms (EM) improving, the single Spartina alterniflora, the mud, and the water] of red swamp crayfish Procambarus clarkii juveniles. The results showed that the survival rate was significantly greater in the EM group than that in the S. alterniflora group, without significant difference from the other two groups. The red swamp crayfish in the EM group had the significantly higher average body length growth than the crayfish in the other three groups did, and the significantly higher average weight gain than those in the mud group and the water group, but close to the S. alterniflora group. All crayfish in four groups had allometric growth patterns, and the juveniles in the EM group had the minimal condition factor. The bottom matrix in the EM group and the S. alterniflora groups affected the soil microbial community structure. Compared with the single S. alterniflora group, there was lower total organic carbon (TOC) and total nitrogen (TN) contents at the bottom matrix of the EM group. It proved that the litter of S. alterniflora directly flowing into the mud matrix had a significant inhibitory effect on the survival of red swamp crayfish. Adding EM improved the deterioration of habitat caused by S. alterniflora decomposition in mud matrix,accelerating decomposition, reducing poison and promoting growth. These findings provide technical support for promotion of red swamp crayfish aquaculture in coastal mudflats and increase the ecological utilization value of S. alterniflora, which provides reference with ecological management of mudflats.
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Received: 28 June 2020
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