Abstract: The feeding, reproduction, age and growth of dark sleeper Odontobutis obscura (Temm. et Schl.) were studied annually. The dark sleeper is a carivor,preying mainly on shrimps and small fishes as well as on aquatic insect larvae. Bothsexes of dark sleeper reach their sexual maturity at 1 year old. The sex-ratio (♀：♂)is 1:1. 34 in total, with great fluctuation around the breeding season. The breedingseason lasts from early April to mid-June. Dark sleeper spawns in "nest" and themale guards in the nest The individual absolute fecundity varies from 540 to 1943eggs (1154 ±317 eggs on average). In the capture, 2-and 3-year-old individualswere the majority, and individuals of 8.0cm to 14.0cm in body length and 10.0g to40.0g in body weight were met frequently. The relationship between body-length andbody-weight can be expressed as W=0.02129L3.0585. The males grow faster than thefemales. Individuals of both sexes slow their growth down at age of 3. Theparameters of VBGF (von Bertalanffy Growth Formula) is♀：L∞ = 15.29cm, W∞=84.9g, t0 = 0.1596, k = 0.4072,♂： L∞ = 16.71cm, W∞= 118.5g, t0 = 0.1095, k=0.3736. The inflexion point of female's bodyweight growth curve is at age (ti) of 2.9a and body-weight (Wi) of 25.1g, that of male's is at age (ti) of 3.1 a andbody-weight (Wi) of 35.4g.