Development of specific microdiets for greater amberjack (Seriola dumerili) larvae with selected local microalgae

The development of aquaculture faces significant challenges, particularly in ensuring the availability of juveniles. Greater amberjack ( Seriola dumerili ), known for its fast growth and market value, has potential for aquaculture diversification. However, one major obstacle is the weaning phase, where live prey (e.g., Artemia ) must be replaced by inert microdiets. This study evaluates five experimental microdiets containing 4 % of selected microalgae ( Nannochloropsis sp , Arthrospira platensis , Isochrysis galbana , Tetraselmis striata , and Dunaliella salina ) on the growth, survival, stress resistance, histology and osteology of Seriola larvae. The best results for growth, survival and stress resistance were observed with the Nannochloropsis sp diet. Histological and osteological studies showed minor differences among diets, with the lowest incidence of vertebral anomalies occurring in the I. galbana treatment. • Nannochloropsis gaditana diet improved growth and survival in Seriola dumerili larvae. • Histological analysis showed minimal liver and gut alterations across microalgae diets . • Inclusion of Isochrysis galbana reduced skeletal anomalies in S. dumerili larvae . • Carotenoid-rich diets enhanced stress resistance and survival post-air exposure tests. • Microalgae diets offer sustainable alternatives for greater amberjack aquafeeds.