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| Population Fecundity and First Maturity of Yalu River Sleeper Odontobutis yaluensis |
| DUAN Youjian, LUO Xiaonian, LI Wenkang, HAN Muxuan, WU Chen, TONG Ke |
| Key Laboratory of Fish Applied Biology and Aquaculture in North China, Liaoning Province, School of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China |
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Abstract In order to understand the population fecundity and first maturity, the fecundity of Yalu River sleeper Odontobutis yaluensis population and the relationship between its biological index in eastern Liaoning were studied. The biological problems of population reproduction and first sexual maturity of 1—4 years old Yalu River sleeper were investigated in 319 samples including sexually mature sample (118 females and 42 males) collected from the tributaries of the Yalu River (Dayang River, Ai River and Pushi River), and the upper reaches of Taizi River and Biliu River in August and October 2018, January 2019 and October 2020, by ground traps with mesh of 1.5 cm and electric fish machine to provide basic biology information for conservation and development of Yalu River sleeper stock. The L50% results showed that the Yalu River sleeper at first maturity had body length of 64.9 mm in female, and body length of 96.1 mm in male, with the corresponding first maturity ages of 1.1 years and 2.2 years, respectively. The weight analysis indicated that the Yalu river sleeper population had average absolute fecundity of (1200.25±942.12) eggs, and the average relative fecundity of (40.06±11.92) eggs/g, with positively correlation between absolute fecundity with body length and body weight, without significant correlation with age. In conclusion, Yalu River sleeper is a fish with low fecundity and early first maturity.
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Received: 05 February 2021
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