Effects on fatty acids profile of Seriola dorsalis muscle tissue fed diets supplemented with different levels of Ulva fasciata from an Integration Multi-Trophic Aquaculture system

Abstract

The present work aimed to evaluate the effects of different levels of Ulva fasciata obtained from an Integration Multi-Trophic Aquaculture (IMTA) culture and added at different levels (0, 5, 10, and 20 g kg−1) to formulated isoproteic and isolipidic diets (45% crude protein and 12.5% crude fat) for Seriola dorsalis on growth, hematology, and fatty acid profile content in muscle tissue. One hundred and twenty juveniles (7.93 ± 0.24 g) were randomly distributed into 12, 500 L tanks connected to a recirculating system (four treatments in triplicate groups). After 48 days that fish were fed at 5% of the initial fish biomass, no effects on growth performance and somatic parameters were found. However, concerning the hematological parameters, the hematocrit showed statistical differences among the treatments, being higher in fish fed the U-20 diet than the control (U-0). Moreover, U. fasciata supplementation at 10 g kg−1 resulted in a decrease of approximately 20% in linoleic acid and an increase of approximately 49% in DHA of muscle tissue, most likely associated with LC-PUFA sparing effect. Therefore, the addition of U. fasciata from IMTA culture improves the fish muscle tissue quality.