Abstract.Two experiments were carried out to study the effect ofn‐3 HUFA levels in rotifers on survival, growth, activity and fatty acid composition of gilthead bream,Sparus aurata(L.), larvae. From the third to the 15th day after hatching, gilthead bream larvae received one of the three kinds of rotifers containing different percentages ofn–3 HUFA. Moisture, crude lipid, saponifiable matter and fatty acid composition of total lipids of rotifers and larvae were determined.A good correlation was found between larval growth andn–3 HUFA levels in rotifers. Larval survival was also significantly improved by the elevation of then–3 HUFA levels in rotifers. A high occurrence of hydrops was registered in larvae fed with EFA‐deficient rotifers. Then–3 HUFA levels in the larvae were increased by the elevation ofn–3 HUFA contents in rotifers. However,n–9 fatty acids in the larvae remained almost constant, regardless of the different 18:1n–9 contents in rotifers. Therefore, the ratio of oleic acid ton–3 HUFA, known to be an indicator of the EFA deficiency in fish, was reduced by the elevation of then–3 HU
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