Age and Growth of Triplophysa (Hedinichthys) yarkandensis (Day, 1877) in the Tarim River in Xinjiang, China
Age and Growth of Triplophysa (Hedinichthys) yarkandensis (Day, 1877) in the Tarim River in Xinjiang, China
Xinyue Wang1, Shengao Chen1,2*, Fangze Zi1, Jianmin Ge1, Desheng Chang1, Yong Song1 and Congxin Xie2
ABSTRACT
Influenced by water pollution and flow modification, Triplophysa (Hedinichthys) yarkandensis (Day, 1877) may become an indigenous endangered fish species in the Tarim River. In order to study its population characteristics and improve the conservation measures, 940 specimens of T. yarkandensis were collected in 2018 and 2020 from the Alar Section of Tarim River. Otoliths were chosen as the main age structure in this study. Results showed that the rings of T. yarkandensis formed once per year from March to May. The ages ranged from 1+ to 10+, with 2.5+ to 6.5+ predominating in the total specimens. Among them, 5+ predominated for males and 4+ to 6+ predominated for females respectively. The standard length (SL) of the specimens ranged from 30.0 to 195.0 mm, and the body weight (BW) ranged from 3.40 to 114.00 g. The predominating SL ranged from 75.0 to 125.0 mm, accounting for 51.81% of the specimens. Length-weight relationship was described as W = 0.0355 × L 2.5916 (R2 = 0.8736, n = 940). Growth was described by the von Bertalanffy equation: Lt = 184.79 (1−e−0.1026 (t +1.0458)), Wt = 68.08 (1−e−0.1026 (t + 1.0458))2.5916 for male and Lt = 236.63 (1−e−0.0900 (t + 0.1831)), Wt = 129.16 (1−e−0.0900 (t + 0.1831))2.5916 for female. Age at inflection point for male and female were 8.24 and 10.39 years, respectively. The goal of this study is to better understand the population’s makeup and migratory patterns in order to exploit and develop germplasm resources of T. yarkandensis. Subsequent efforts should be made to prevent overfishing of young fish by limiting the minimum fishing individuals, and to protect older individuals by banning fishing during the breeding period.
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