described herein is a novel method for the implantation of fish eggs usually salmonidae eggs in a stream or lake bed and the accompanying apparatus . in practicing this invention the stream or lake bed substrate is subjected to high pressure hydraulic flushing to loosen the gravel and remove undesirable sediment . once the substrate has been properly prepared fertilized eggs are injected by means of hydraulic pressure into the substrate . the egg planting device of this invention comprises a receptacle for the fertilized eggs which has a valved orifice at its base through which the eggs pass into a central chamber and which central chamber has a lateral orifice to permit the entry of water ; the flow of the water being governed by a control valve and the base of the central chamber being provided with a rigid hollow tubing adapted for insertion into the substrate .