Age and Growth of Triplophysa (Hedinichthys) yarkandensis (Day, 1877) in the Tarim River in Xinjiang, China | [Pakistan Journal of Zoology • 2024]

Author(s):

1. Xinyue Wang: College of Life Sciences and Technology, Tarim University, Tarim Research Center of Rare Fishes, Alar Xinjiang 843300, China

2. Shengao Chen: College of Life Sciences and Technology, Tarim University, Tarim Research Center of Rare Fishes, Alar Xinjiang 843300, China; College of Fisheries, Huazhong Agricultural University, Wuhan Hubei 430070, China

3. Fangze Zi: College of Life Sciences and Technology, Tarim University, Tarim Research Center of Rare Fishes, Alar Xinjiang 843300, China

4. Jianmin Ge: College of Life Sciences and Technology, Tarim University, Tarim Research Center of Rare Fishes, Alar Xinjiang 843300, China

5. Desheng Chang: College of Life Sciences and Technology, Tarim University, Tarim Research Center of Rare Fishes, Alar Xinjiang 843300, China

6. Yong Song: College of Life Sciences and Technology, Tarim University, Tarim Research Center of Rare Fishes, Alar Xinjiang 843300, China

7. Congxin Xie: College of Fisheries, Huazhong Agricultural University, Wuhan Hubei 430070, China

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. Lengthweight relationship was described as W = 0.0355 × L 2.5916 (R2 = 0.8736, n = 940). Growth was described by the von Bertalanyf 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 eforts 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.

Page(s): 1771-1780

DOI: 10.17582/journal.pjz/20221031021052

Published: Journal: Pakistan Journal of Zoology, Volume: 56, Issue: 4, Year: 2024

Keywords:

Tarim River , Otolith , Triplophysa yarkandensis

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