DESCRIZIONE
An apparatus (10) suitable for growing baby crustaceans comprises a tank (12) of generally circular cross-section for containing water; a chamber (30) below the tank, and a duct (36) extending from the chamber to a position near the top of the tank; and means (50, 51, 53, 54) to recirculate water through the duct and the tank. During normal use the water may be recirculated through a biofilter; whenever the crustaceans are being fed the water is recirculated without any biofilter. The apparatus (10) enables baby crustaceans such as lobsters to be grown, ensuring they do not eat each other, until they are large enough that they can fend for themselves in the wild.