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| Age and Growth of Yalu Sleeper Odontobutis yaluens in Liaoning Province |
| DUAN Youjian1,2, LUO Xiaonian1,2, HAN Muxuan1,2, LI Wenkang1,2, LIN Shaoqing3 |
1. School 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. Animal Epidemic Disease Prevention and Control Center of Tibet Autonomous Region, Lhasa 850000, China |
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Abstract In order to describe and infer the growth characteristics of fish and reduce the selection error of the model effectively, the growth characteristics were investigated in 204 samples of Yalu sleeper Odontobutis yaluens collected from the upper reaches of Taizi River and Biliu River in the Yalu River system in Liaoning Province from August 2018 to January 2019 by traps with mesh size of 1.5 cm and electric fish machine by information theory and age identification via otolith. The results showed that the Yalu sleeper had simple age structure, consisting of only 3 age classes, 2 age classes in female and 3 age classes in male. Through the construction of growth equation, the weight coefficients of Akaike information were found to be 0.019 in estimated progressive equation growth model, 0.086 in linear equation model and 0.895 in power function mode. Since the weight coefficient corresponding to the power growth model was much higher than the estimated value of the other two alternative models, it was not necessary to calculate the average growth model. The power growth model was the optimal model to describe the growth characteristics of Yalu sleeper, and the growth equation was expressed as Lt=69.7+1.439t3.688. The findings provide basic data for the research of population dynamics and fishery management policies of Yalu sleeper and reducing fishing intensity and conserving the resources of Yalu sleeper and other indigenous fish are suggested.
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Received: 20 May 2024
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