p. 149 - 153 THE INFLUENCE OF COBALT ON THE GROWTH RATE OF ARTICIALLY FED MULLET (MUGIL SPP.) SPAWN - PRELIMINARY DATA Reveica Ionita and Viorica Boghici Romanian Marine Research Institute Constantza Abstract Results of laboratory experiments concerning administration of cobalt in the food of grey mullet (Mugil spp.) spawn are presented. The achieved growth rate differs by a 14% increment from that of the witness.