The longfin yellowtail Seriola rivoliana is considered an excellent
candidate for intensive marine aquaculture due to its fast growth rate,
high flesh quality, and adaptability to intensive culture conditions. The
species is found world-wide in subtropical to warm water seas and
can reach up to 60 kg in weight (Randall, 2007). S. rivoliana has been
commercially farmed in Hawaii and marketed as a sashimi-grade
product for more than a decade (Laidley et al., 2004). There is also
growing interest in culturing this species in the Mediterranean region
(Roo et al., 2014). Yellowtails from the genus Seriola are carnivorous
fish reared primarily in net cages and fed either fresh fish or pelleted
diets high in FM and FO (Nakada, 2008). Yellowtail culture would benefit greatly from identification of alternative ingredients or ingredient
blends that can effectively spare or replace dietary FM and FO. Thus,
the aim of this study was to evaluate the use of soy protein concentrate
(SPC) and algal meals to partially replace FM in low-FO diets for longfin
yellowtail in the context of fish growth, feed utilization, fillet fatty acid
composition, and intestinal cell and tissue integrity.