An aquarium exhibited by a Los Angeles artist in the Hayward Gallery, London, is described. 6 rubber and fibreglass tanks each hold 4.5 m super(3) water aerated, and pumped and filtered daily. Purification is under pressure, on a 0.1 m super(2) filter of 0.45 mm sand particles. The rearing of fish, lobsters, crabs, shrimps, algae and oysters is described. Fish are killed by electrocution, the apparatus being illustrated. A galvanised steel transport tank is described in which fish may be kept alive for 30 hr.