Abstract: A floating trout hatchery system was designed to meet the fry requirement of a 150 tonnes/year capacity floating trout farm. This system is made of angle iron, grooved- galvanized sheet iron, steel sheet and PVC and is floated on drums (60 L). Incubation channels were sunk to a depth of 23 cm below the surface. In determination of the system’s performance efficiency the fertilization ratio; eyed-egg ratio; hatching ratio and swim up larvae rate were calculated as 98.18, 80.02, 58.83 and 85.47%, respectively. The overall performance ratio from fertilization through to development of swim-up larvae was also calculated as 39.47%. It was concluded that the system’s performance could be increased, if the effect of waves can be reduced.