The Reproductive Characteristics of Garra tibetana, an Endemic Labeonine Fish in the Lower Yarlung Tsangpo River, Tibet, China

The reproductive characteristics of an endemic labeonine fish, Garra tibetana, were investigated by examining 778 individuals collected monthly, from December 2015 to November 2016, in the lower Yarlung Tsangpo River, Tibet, China. Results showed that females predominated overall population with a sex ratio 1:0.73, while for mature was 1:1. Standard length at first maturity estimated as 82.4 mm and 55.4 males based on logistic regression. Analyses monthly variation gonad-somatic index, proportion gonad development, frequency distribution oocyte diameter demonstrated spawning period G. tibetana be February April, peak March. Absolute fecundity ranged 113 440 oocytes, mean 201.8 ± 58.7 oocytes. relative 6 18 oocytes per gram, 11.7 2.6 gram. positive correlations standard length, body weight, revealing larger produced more offspring. In conclusion, matures early spawns synchronously low large These could explain why this species is dominant its habitat also provide valuable information developing applicable management conservation strategies.