There is provided a method of improving the nutritional content of marine worms, such as polychaetes, by feeding the worms a diet having a concentration of pigments, polyunsaturated fatty acids, lipids, vitamins and/or minerals sufficient to enhance the level of such components) within the tissue of the worms. The worms can then be used for aquaculture, for example in farming marine fish and/or shrimps. One component of particular benefit is astaxanthin, which is preferably present in the polychaete diet of the worms at a concentration of at least 200ppm. Advantageously the diet fed to the worms will include at least l0á by weight of vegetate oil. Conveniently the worms may be dried by lyophilisation or by refractance window drying before optionally being included or formed into pellets for aquaculture or other (i.e. aquarium) use.
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