Abstract: A system is described for holding dense population of filter-feeding organisms, such as free, or "cultchless" oysters and hardshell clams in a configuration opposed to currents of nutrient-laden sea water. The system consists of means that both channel currents, or water flows developed by pumping, gravity flow, or tidal forces and hold the populations in opposition to these currents. A distributing flow of water is achieved throughout the populations contained in the system so that individual members of the population may filter at optimum rates, with waste products of their filtering activities being removed by the current.The system is capable of taking tiny hatchery-derived seed and growing them to commercial maturity in a series of stages designed to optimize handling and feeding requirements at the various stages.

Abstract: A system is described for holding dense population of filter-feeding organisms, such as free, or "cultchless" oysters and hardshell clams in a configuration opposed to currents of nutrient-laden sea water. The system consists of means that both channel currents, or water flows developed by pumping, gravity flow, or tidal forces and hold the populations in opposition to these currents. A distributing flow of water is achieved throughout the populations contained in the system so that individual members of the population may filter at optimum rates, with waste products of their filtering activities being removed by the current.The system is capable of taking tiny hatchery-derived seed and growing them to commercial maturity in a series of stages designed to optimize handling and feeding requirements at the various stages.