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| Culture Model of Red Swamp Crayfish Procambarus clarkii Using Artificial Shelter in Ricefield Eel Monopterus albus Ponds |
| ZHANG Xiaorui1, ZHOU Meng1, LI Jianwei1, XU Qing1, TAN Dunbin2, YAO Bo2, YU Dahui2, ZHANG Menghua3, TAN Qingsong1 |
1. Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affairs, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;
2. Jianli Water Resources and Lakes Bureau, Jingzhou 433300, China;
3. Jianli Aquatic Industry Development Center, Jingzhou 433300, China |
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Abstract To provide methods and theoretical basis for red swamp crayfish Procambarus clarkii [initial body weight (5.35±0.02) g] culturing using artificial shelters in ricefield eel Monopterus albus ponds, five experimental groups were established: three PVC pipe treatments within cages (group A: 0 pipes, group B: 30 pipes, group C: 60 pipes) and two inter-cage attachment rack shelter treatments (group D: 2 frames, E: 4 frames) for a 56-day trial. The results showed that there were significantly lower final body weight (FBW), weight gain rate (WGR), and specific growth rate (SGR) in groups B and C than those in group D. However, there was significantly higher retention rate (RR) than that in group A. The crayfish had significantly lower condition factor (CF) in groups A and B than the crayfish in group D did, and had higher muscle rate (MR) and proportion of edible parts (PEP) than the animals in groups D and E did, with average yield of 3 364.05 kg/hm2 in Group D area and 3 780.45 kg/hm2 in Group E area. There was significantly lower serum low-density lipoprotein (LDL) in groups A, B and C than that in the other groups, and significantly lower serum total protein (TP) in group C than that in groups A and B. The significantly lower cortisol was found in group B than that in groups D and E. The serum alkaline phosphatase (AKP) was shown to be significantly higher in groups A and B than that in other groups, with significantly higher serum alkaline phosphatase (ACP) in groups B, D and E than that in groups A and B. The crayfish had higher antioxidant capacity and desiccation tolerance in groups A, B and C than the animals in groups D and E did, with the best desiccation tolerance in the crayfish in group B. There was higher crude protein content in muscle in groups D and E than that in the other groups, with the higher crude protein content in whole body in group A than that in other groups. The muscular total saturated fatty acid (∑SFA) of muscle was shown to be significantly higher in groups B and C than that in the other groups, with the opposite trend in total monounsaturated fatty acids (∑MUFA), and without negative impact on the fatty acid composition of red swamp crayfish in cage culture. The results indicated that deploying 30 PVC pipes per cage led to significantly enhance survival rate and stress mitigation. Combined with inter-cage placement of 2 attachment racks, this configuration achieves 3300 kg/hm2 yield, indicating that establishing three-dimensional ecological niches to replace traditional submerged vegetation systems, simplifying management. This model synergistically improves P. clarkii health and farming benefit, offering an ecological solution for intensive aquaculture.
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Received: 12 December 2024
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