Relationship Analysis Between Body Weight and Morphological Traits of Kuruma Shrimp Marsupenaeus japonicus in Polyculture Ponds
ZHOU Yinuo1,2, ZOU Yan1,3,4, LIU Ying1,3,4, YU Chaoyong1,3,4, WANG Youhong1
1. Marine Science Research Institute of Shandong Province, Qingdao 266104, China; 2. Qingdao University of Science and Technology,Qingdao 266061, China; 3. Shandong Key Laboratory of Intelligent Marine Ranch (under preparation), Qingdao 266104, China; 4. Engineering Laboratory for Exploration and Utilization of Marine Germplasm Resources of Qingdao, Qingdao 266104, China
Abstract：In order to investigate the relationship between morphological traits and body weight of kuruma shrimp Marsupenaeus japonicus in the polyculture model of shrimp and crabs in ponds, 12 morphological traits affecting body weight, including body length (X1), carapace length (X2), and body weight (Y), were measured in 150 samples of healthy and mature kuruma shrimp (male-to-female ratio of 1∶1) from a 1.0 hm2 polyculture pond stocked with 30 000 kuruma shrimp and 10 000 swimming crab Portunus trituberculatus at Jiaozhou Bay in October 2024. The regression equations, and the optimal fitting model were established by correlation analysis, path analysis, and regression analysis. The path coefficients were found to be 0.493 for body length (X1), 0.416 for carapace length (X2), and 0.090 for the sixth abdominal segment width (X9), with the maximal determination coefficient (0.243) of body length for body weight. The sum of the direct and indirect determinants of these three morphological traits on body weight was shown to be 0.894, greater than 0.850, indicating that the body weight of kuruma shrimp was primarily dependent on these three morphological traits. The multiple regression equation for body weight was established by regression analysis: Y=-24.922+1.884X1+3.768X2+2.463X9. The best-fit models for body weight versus body length and carapace length were Y=1.003e0.246X1 (r2=0.912) and Y=0.176X2.7802 (r2=0.901), respectively. The optimal model for the sixth abdominal segment width was described as Y=e(4.324-1.180/X9) (r2=0.744). In conclusion, under the shrimp-crab polyculture system, body length and carapace length are the key traits affecting the body weight of kuruma shrimp, while the sixth abdominal segment width serves as an auxiliary trait. These findings provide valuable data references for its breeding programs.
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2026, Vol. 45 
