50 June 2012 toring should be done at different times of the day because phosphate levels within the system can change dramatically following events such as feeding. General In general, hygienic conditions should be maintained in holding facilities for sea urchins and this should be a priority in system design. Animals should be physically separated from feed waste and feces on the tank floor using perforated false bottoms in tanks. This configuration also facilitates cleaning tank bottoms and avoids negative water quality effects from organic sediments. Water quality can become an issue in sea urchin farming when the supply of water is restricted, particularly in recirculating systems with minimal replacement of seawater. Most of the potential problems outlined in this article can be avoided by keeping sea urchins in well-designed sea-based facilities, where natural water currents provide animals with sufficient water to prevent the occurrence of poor water quality. 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