Estimates on age, growth, and mortality of <i>Gymnocypris firmispinatus</i> (Cyprinidae: Schizothoracinae) in the Anning River, China -- Journal of Oceanology and Limnology,2019,37(2):736-744

	Cite this paper:
	MA Baoshan, NIE Yuanyuan, WEI Kaijin, XU Bin, ZHU Xiangyun, XU Jin. Estimates on age, growth, and mortality of Gymnocypris firmispinatus (Cyprinidae: Schizothoracinae) in the Anning River, China[J]. Journal of Oceanology and Limnology, 2019, 37(2): 736-744

Estimates on age, growth, and mortality of Gymnocypris firmispinatus (Cyprinidae: Schizothoracinae) in the Anning River, China

MA Baoshan¹, NIE Yuanyuan^1,2, WEI Kaijin¹, XU Bin¹, ZHU Xiangyun¹, XU Jin¹

1 Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China;
2 Development Center for Animal Husbandry in Mountain Area in Miao Autonomous County of Songtao, Tongren 554100, China

Abstract:

The age, growth, and mortality of Gymnocypris firmispinatus were studied by 582 individuals that collected between July 2015 and June 2016 from the tributaries of the Anning River, China. The total length (TL) ranged from 27 mm to 242 mm, total weight (W) ranged from 0.2 g to 148.2 g. The relationship of total length and weight was expressed as W=7.754×10^-6TL^3.304 for the total samples. The age classes of males were 1-9 a, and that of females were 1-13 a. The von Bertalanffy functions based on otolith readings and observed length data were L_t♂=198.6(1-e^{-0.094 (t+3.497)}), and L_t♀=289.3(1-e^{-0.089 (t+1.109)}). The total mortality (Z) of male and female G. firmispinatus was estimated as 0.73/a and 0.40/a, respectively. The natural mortality (M) was evaluated as 0.25/a for males and 0.20/a for females, fishing mortality (F) was 0.35/a for males and 0.16/a for females. The exploitation ratio of the population was 0.66/a for males and 0.50/a for females. It was concluded that the growth of the fish is relatively slower than other congeneric fishes. The population of G. firmispinatus in the tributaries of the Anning River might be in over-exploitation under the current fishing intensity.

Key words: otolith|growth|von Bertalanffy model|mortality|Gymnocypris firmispinatus

Received: 2017-12-06 Revised: 2018-02-14

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