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The effects of seaweed diets on the growth and biochemical composition of the white sea urchin Tripneustes gratilla were studied using three seaweeds with different fatty acid (FA) profiles: Ulva pertu sa (green alga, high in 16:4n-3, 18:3n-3, and 18:4n-3 polyunsaturated fatty acids or PUFAs), Gloiopel tis furcata (red alga, rich in 20:4n-6 and 20:5n-3 PUFAs) and Undaria pinnatifida (brown alga, abun dant in 18:3n-3, 18:4n-3, 20:4n-6, and 20:5n-3 PUFAs). Specific growth rates (dry weight basis) were the highest in the animals fed Undaria (including the mixed algal diet), followed by Ulva and Gloiopel tis. The highest feed conversion efficiencies (on a dry weight basis) were with Undaria (80.0%) and Ulva (76.6%) while the lowest was with Gloiopeltis (51.5%). All algal diets did not affect the major lipid class es of the sea urchin tissues. The poor growth rates associated with a seaweed diet deficient in 18:3n-3, 18:4n-3, or 20:4n-6 (such as Gloiopeltis and Ulva) suggest that these FAs may be essential for juveniles of the white sea urchin.

The Effects of Seaweed Diets on the Growth, Lipid and Acids of Juveniles of the White Sea Urchin <i>Tripneustes gratilla</i>