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The aim of this study was to establish phytoplankton composition at the sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) fish farm in the middle Adriatic Sea. The investigation was performed from September 2005 to September 2006 at a station located in Maslinova Bay at the island of Brač. Considering the whole research period, diatoms generally prevailed in terms of abundance while dinoflagellates were particularly abundant in June. Number of species of diatoms in comparison to dinoflagellates through the investigated period was similar. From 111 species of phytoplankton found, there were 55 species of Bacillariophyceae (diatoms), 47 species of Dinophyta (dinoflagellates), 5 species of Prymnesiophyceae, 3 Chrysophyceae and 1 Euglenophyta. Among the diatoms, the majority of species belonged to genus Chaetoceros. The most represented dinoflagellate genera were Oxytoxum and Gymnodinium. There were no considerable differences in phytoplankton composition with respect to different depths, but seasonal influence was significant. Biodiversity and abundance ranges of phytoplankton species indicated good water conditions and there were no evident alterations induced by the increased release of nutrients., Cilj ovog rada je utvrditi sastav fitoplanktona na uzgajalištu komarči (Sparus aurata) i lubina (Dicentrarchus labrax) u srednjem Jadranu. Istraživanje je provedeno u razdoblju od rujna 2005. do rujna 2006. godine na postaji smještenoj u uvali Maslinova na otoku Braču. Promatrajući cijelo istraživano razdoblje, dijatomeje su općenito prevladavale svojom brojnošću, dok su dinoflagelati bili brojniji u lipnju. Broj vrsta dijatomeja i dinoflagelata kroz istraživano razdoblje bio je sličan. Zabilježeno je 111 vrsta fitoplanktona, od kojih je 55 vrsta iz skupine Bacillariophyceae (dijatomeja), 47 vrsta Dinophyta (dinoflagelata), 5 vrsta Prymnesiophyceae, 3 vrste Chrysophyceae te 1 vrsta Euglenophyta. Većina vrsta dijatomeja pripada rodu Chaetoceros. Najznačajnije zastupljeni dinoflagelati pripadaju rodovima Oxytoxum i Gymnodinium. Nije bilo značajne razlike u sastavu s obzirom na dubine postaje, dok je sezonski utjecaj bio značajan. Biodiverzitet i brojnost fitoplanktona ukazuju na povoljne uvjete vodenog stupca u blizini uzgajališta; nema promjena uvjetovanih povećanim ispuštanjem nutrijenata.