Cherax quadricarinatus can be found in the Katoman River. To understand the reproductive biology of that lobster, a study was conducted from August-October 2023. Samplings were conducted 6 times, once/ 2 weeks. The lobsters was captured using a net trap with 0.5 inch mesh size. Parameters measured were total length, wet weight, length-weight relationship, sex ratio, sexual characteristics, gona…