Study on the Growth and Age of Spinibarbus denliculatus denliculatus in Pearl River System

Study on the growth characteristics of Spinibarbus denticulatus denticulatus Oshima were carried out based on the specimens collected from Xijiang valley and Beijiang valley of the Pearl River system. The results show that the annual-ring feature belongs to the loose-close and cut pattern. The new annual-ring is formed during the period from April to June. The relationship between body length and weight of S. d. denticulatus in Xijiang valley and Beijiang valley can be expressed by the power function equations: WX=2.4984×10-2L2.9996(r=0.9561) and WB=1.3733×10-2L2.8159(r=0.9253) respectively. Based on the analysis of the growth stage, the female S. d. denticulatus gets mature at the age of five years old. The male one gets mature at the age of three years old. The breeding season of S. d. denticulatus is from April to June.