TITLE:
Growth, Mortality and Stock Assessment of Squaliobarbus curriculus (Actinopterygii: Cypriniformes: Xenocyprididae) from Lanxi Section of Qiantang River, China
AUTHORS:
Aiju Zhang, Wei Luo, Zhiming Zhou, Aihuan Guo, Qinping Lian, Pengcheng Sheng, Julin Yuan
KEYWORDS:
Lanxi Section of Qiantang River, Population Dynamics Parameters, Squaliobarbus curriculus, Stock Assessment
JOURNAL NAME:
Open Journal of Animal Sciences,
Vol.13 No.3,
July
21,
2023
ABSTRACT: Population dynamics parameters and stock status of Squaliobarbus curriculus (Richardson, 1846) were analyzed from May to September 2021 in the Lanxi section of Qiantang River. FiSAT II software
program was used. The growth coefficient K = 0.21 year–1, asymptomatic length L∞ = 39.48 cm, and age at theoretical zero-length t0 = –0.74 years were
estimated. The von Bertalanffy growth function was calculated as Lt = 39.48[1 – e–0.21(t + 0.74)]. The growth curve for
weight had an inflection at 5.86 years, corresponding to 29.61 cm in standard
length and 372.29 g in weight. The natural mortality rate (M), the fishing mortality rate (F),
and the total mortality rate (Z) were
calculated as 0.51, 0.61, and 1.12 year–1,
respectively. The exploitation ratio (E)
was 0.54, which is greater than the value of 0.5 suggested by Gull (1971), indicating a probable state of overdevelopment. The annual
average stock number and biomass of S.
curriculus in the Lanxi section of Qiantang River were 31.86 × 106 individuals and 3656.82 t,
respectively.