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The southern surf crab  Ovalipes trimaculatus  (de Haan, 1833) presents a high potential for aquaculture. In this study, we analyze the benefits of different dietary treatments on its molt success and fitness of larval stages.  Artemia persimilis  nauplii were enriched with monospecific ( Nannochloropsis oculata, Tetraselmis suecica, Dunaliella salina, Isochrysis galbana and Chaetoceros gracilis ) and multispecific (Mix) microalgal diets twice a day over a 48-h period. Mean total length (TL), growth instar number (I) and gut fullness rate (GFR) of nauplii showed significant differences between dietary treatments at several sampling times, optimal results being observed in those providing Mix.  Artemia  nauplii grown under most experimental dietary treatments reached the capture size limit for  Ovalipes trimaculatus  zoea I (700 µm) within 24 h. After that time interval, Mix-enriched nauplii were amongst those with higher protein contents.  Ovalipes trimaculatus  zoea I fed on  Artemia  nauplii enriched during 24 h under different dietary treatments showed significant differences in survival, inter-molt duration, molting success to zoea II and motility. Optimal results were observed in zoea I fed on Mix-enriched  Artemia  nauplii. This work not only represents a first step towards the dietary optimization for  O. trimaculatus  zoeae rearing but also provides the first results on the use of enriched  A. persimilis .

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Rearing enhancement of Ovalipes trimaculatus (Crustacea: Portunidae) zoea I by feeding on Artemia persimilis nauplii enriched with alternative microalgal diets