Abstract: In October 2006-October 2008, a total of 136 specimens of oriental sucking barb (Garra orientalis) with body length 54-167 mm and body weight 3-114.6 g were collected from Nujiang River. The stock mass of the oriental sucking barb in the River was tentatively estimated by using length-based cohort analysis (LCA), and the Beverton-Holt dynamic model was developed to predict the population dynamics of the oriental sucking barb to support fishery management. The total mortality rate (Z) and the natural mortality rate (M) of the population were 0.511 and 0.238, and the fishing mortality rate (F) and current exploitation rate (E) were 0.273 and 0.534 per year, respectively. In 2006-2008, the average stock of the oriental sucking barb was 1.47×10⁴ kg, with 1.08×10⁶ individuals, and the initial stock was 1.87×10⁴ kg, with 1.38×10⁶ individuals. The analysis of related parameters and relative yield per recruit suggested that the oriental sucking barb in Nujiang River was in over-exploitation.Consequent conservative fishery strategy should be carried out to protect the resources of oriental sucking barb in Nujiang River.

Key words: Perinereis aibuhitensis, cadmium, petroleum hydrocarbons, bioaccumulation, metallothionein.