Cdriasiscus (La,eepdae) in fresh water catfish and has been reared in South China, and South Asian countries In paper, wa deal with morphology, re-production capacity and the change of maturity coafficient in annual cycle by analysing the result of nur experiment in 1978-1982.The oontent may be sumxuarized as follows:1.According to the data from 529 fish, the relationship bet，body weist (W) and body lenmh (L) may be expressed1922 Lsw8. The regression coefficient of these two varieties of G Zurius from. 13.5-35 cm in body length is different be- tween female and male The former is 1.425 (W=14.859一115.2174 ) and the latter,4.834(W=9.375L--85.625 ).In norrzaal conditions, the female is found to be of relative plumpness 1.43---1.?8，the male, 1.23---1.41，Differences of both figures are signifiean External characteristics, by comparing the diameter of eyes, interorbital space, the shape of snout, the shape of head, etc. are sufficiently reliable far the identification of both sexes. 2.The data of reproduction capacity from 86 fish, the formulas of relation between body length (L) nr body weight (W) :end average absolute broad amount (It) may be gprcssed as R=0.49586L--T.3756364 and 1t=4.4474T-4.676548.Tarom 179 fish, the relation between body weight (W ) and average absolute spaw- ping amount (Ti ) may be expressed as R=39.121g5W-1840.02439. The largest average relative breed aunt of the female has a body length of about 14.5-24.5 cm, body weight, 53-1158. The average relative breed amount is 61.321-78.62 eggs per gram in body weight. The largest average amount has a body weight of about 148--216x. The ag-eraga spawning amount is 24-35 eggs per gram in body weist.3.The annual cycle of the change of maiurity e.oefficient is I3一15 % (female) or 2-3%(male) in the breeding season and lass than 5% (female) or 1 % (male) in other seasons.