Partially replacing fish oil with microalgae ( <i>Schizochytrium limacinum</i> and <i>Nannochloropsis oceanica</i> ) in diets for rainbow trout ( <i>Oncorhynchus mykiss</i> ) reared in saltwater with reference to growth performance, muscle fatty acid composition and liver ultrastructure

The effect of dietary inclusion a mixture microalgae meal (Schizochytrium limacinum and Nannochloropsis oceanica) (1:1 ratio) on growth performance, gene expression, histology muscle fatty acid composition rainbow trout (Oncorhynchus mykiss) reared in saltwater was investigated. Three experimental extruded diets containing 0%, 9% 17% were evaluated triplicate groups during 10-week bioassay. results showed that performance feed conversion ratio significantly reduced by increasing the meal. No significant trends observed with respect to intake relative expression hsp70, scarb1, IL-12 myod. Conversely, levels led decrease vacuolar degeneration hepatocytes. A reduction 23% amount 20:5n−3 found between fish fed control highest level blend diets. Nevertheless, 22:6n−3 content did not vary among treatments. These demonstrate has potential be included up 90 g kg−1 within for as sustainable replacement oil.