Age and Growth of an Endemic Tibetan Fish, Schizothorax o'connori, in the Yarlung Tsangpo River

ABSTRACT

We investigated the age and growth of Schizothorax o'connori in the Yarlung Tsangpo River by examination of annuli from otoliths. The von Bertalanffy model was the most acceptable statistical growth model. Its parameters were as follows: SL∞= 492.4 mm, K = 0.1133, t₀ = −0.5432 year and W∞= 1748.9 g for females; SL∞ = 449.0 mm, K = 0.1260, t₀ = −0.4746 year and W∞ = 1287.0 g for males. Theoretical longevity was 25.9 years for the female and 23.3 years for the male. Moreover, females had larger asymptotic length and weight compared with males.