Aquaculture production in the Mediterranean has rapidly expanded in the last decade. Production techniques have progressed as a result of efforts by the private sector and the scientific community but problems have concurrently been faced. A TECAM (technology of aquaculture in the Mediterranean)seminar was held in Zaragoza (Spain) from 24 to 27 May 1999, and was extended by 83 experts. Through the different seminar sessions the following topics were addressed: marketing of Mediterranean aquaculture species, methodological strategies for the domestication of finfish species - nutrition and feeding, reproduction aspects, husbandry and health management considerations, and recent advances in Mediterranean marine finfish diversification - experiences in new sparids, flatfishes, groupers, seriola, tuna and other species of interest. These proceedings, the eighth volume devoted to aquaculture published in the CIHEAM journal Options Méditerranéennes, compile most of the manuscripts of the posters and oral presentations (reviews and technical papers) made at the seminar. In addition to the manuscripts, a summary of the sessions and open discussions is also included.