Experiments were conducted with the receptacles of reproductive plants of Sargmsum wight;; (Greville) 1. Agardh and Tllrbinaria conoides (1. Agardh) KuelZing to study the effect of different environmental factor.; on the oospore output. The ability to liberate spores and the quantity of spores shed in these two brown algae varied under the environmental factors tested. In general, submerged condition of plants, long day condition at low illuminance, seawater of 30 to 40%. salinity and 25 to 35'C temperature were found to be suitable for maximum shedding of oosporcs in these two algin yield ing plants.