By far and large only two fish species, the gilthead seabream (Sparus aurata) and the seabass (Dicentrarchus labrax), account for the bulk of marine aquaculture production in the Mediterranean Sea. As a direct consequence, the greatest share of the Mediterranean hatchery output is formed by these two species. This manual deals with mass production of gilthead seabream and seabass fry for the aquaculture industry. It focuses only on well-established practices that have reached a standardised industrialisation and can be considered as reliable. In some cases, import difficulties, shortage of adequate funding and unavailability of technical assistance and maintenance services, could limit the adoption of the latest and more capital intensive techniques that are described in this manual. These constraints may be overcome by the adoption of less recent technologies in sections of the hatchery, that are simpler and more labour intensive. When available, these methods are also briefly described in this manual. New developments such as genetic manipulations and hybridization with other species are not covered because they have not yet reached a commercial level. The manual has attempted to provide information on what are current practices in commercial hatcheries and the case study section of the second volume is included to show that different commercial hatcheries may establish different protocols for production that suit better the conditions of their sites or the markets they are supplying. The case study section in particular is not supposed to be up to date as the preparation of the manual has taken considerable time, but is included to show different approaches to production organization. The mentioning of commercial products does not imply an endorsement by the authors. They are mentioned in the text, when they are very common products, only as a matter of information.
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