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| Population Structure and Growth Characteristics of Chinese Hook Snout Carp Opsariichthys bidens in Yalu River |
| DUAN Youjian1,2, LUO Xiaonian1,2, MENG Junpeng1, LI Jiao1, SUN Shuhao3, MA Junfeng4 |
1. College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China;
2. Key Laboratory of Fish Applied Biology and Aquaculture in North China, Liaoning Province, Dalian 116023, China;
3. Dandong Fisheries Development Service Center, Dandong 118017, China;
4. The First Bureau of China Coast Guard Bureau, Shanghai 200000, China |
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Abstract To investigate the population structure and growth characteristics of Chinese hook snout carp Opsariichthys bidens in the Yalu River, the population structure was studied in 156 samples were collected from tributaries of the Yalu River using gillnets with mesh of 1.5 cm in December 2021 and March 2023, using scales as identification materials. The results showed that the Chinese hook snout carp caught had body length of 132—262 mm for females and 139—282 mm for males, with body weight ranging from 31.4 g to 263.5 g for females and 34.7 g to 417.6 g for males, with age composition of 1—4 years, and the female/male ratio of 1.229∶1. The relationship between body length and body weight was found to be m=6.924×10-5L3.152(r2=0.932,n=156), indicating that the Chinese hook snout carp had uniform rate of growth. Von Bertalanffy growth equation showed that the asymptotic total length (L∞) of the Chinese hook snout carp in the Yalu River was 340.864 mm, with growth coefficient (K) of 0.271, the theoretical age of -1.284 at zero total length (t0). In summary, the Chinese hook snout carp in the Yalu River is a small predatory fish, with a simple age structure and rapid growth.
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Received: 02 July 2024
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