Feeding rings are usually used in smaller cages to retain floating feed and prevent wastage. Feeding rings should enclose only a portion of the surface area because rings surrounding the entire cage perimeter may reduce water movement through the cage. However, feeding rings that are too small will allow the more aggressive fish to control access to the feed. If sinking feed is used, small cages may require a feed tray to minimize loss. Site selection and placement of cages Large bodies of water tend to be better suited for cage culture than small ponds because the water quality is generally more stable and affected less by fish waste.
Exceptions are eutrophic waters rich in nutrients and organic matter.
Cages should be placed where water currents are greatest, usually to the windward side. Calm, stagnant areas should be avoided. However, areas with rough water and strong currents also present problems. Cages may be moored individually or linked in groups to piers, rafts, or lines of heavy rope suspended across the water surface. At least 15 feet should separate each cage to opti-mize water quality.