Analysis of Age and Growth of Semilabeo obscurus in the Hongshui River
In order to investigate the age structure and growth characteristics of Semilabeo obscurus in the Hongshui River(Guangxi Zhuang Autonomous Region,China),71 individuals were collected from the Hongshui River in November 2022.The results showed that the age distribution of the collected S.obscurus ranged from 1 year to 6 years,and the number of the individuals with the dominant age(3 years)accounted for 39.44%of the total.The mean body length of S.obscurus samples was 16.51 cm,and the mean body weight was 122.35 g.The relationship between body weight(W)and body length(L)was described by the linear equation:W=0.039L2.827(female),W=0.025L2.963(male),W=0.026L2.964(group).The growth characteristics were in accordance with the von Bertalanffy growth function:♀:Lt=24.74[1-e-0.419 5(t+0.243 8)],Wt=340.65[1-e-0.419 5(t+0.243 8)]2.827;♂:Lt=26.70[1-e-0.310 3(t+0.695 1)],Wt=427.98[1-e-0.310 3(t+0.695 1)]2.963.The inflection age of the growth curve for female and male individuals occurred at 2.38 years and 2.85 years,respectively.This research up-dates the life history parameters of S.obscurus in the Hongshui River and contributes to its stock assessment and sustain-able utilization.
Semilabeo obscurusage structuregrowth characteristicsHongshui River
NETL
NSTL
万方数据
维普
