Abstract: A submersible cage system for cultivating aquatic animals comprises a rigid frame defining a geodesic enclosure, a net supported by the rigid frame to define a water permeable enclosure for the aquatic animals, the rigid frame being rotatable about a horizontal axis, flotation chambers disposed at opposite sides of the rigid frame, the flotation chambers being alternately fillable with a gas or a liquid to increase or decrease, respectively, the cage system's buoyancy, and a mooring for anchoring the frame in a fixed position in a marine environment.

Abstract: There is described an improved hinge including first and second spaced apart tangs, an aperture formed through each of the two tangs to be in axial alignment with one another, and a third tang disposed between the first and second tangs. A resilient grommet is supported by and extends axially through the third tang, spacing it from the first and second tangs. The grommet has a cylindrical aperture formed therethrough for axial alignment with the apertures formed through each of the first and second tangs. A hinge pin is inserted through the aperture in the first and second tangs and the cylindrical aperture through the grommet, thereby interconnecting the first, second and third tangs in hinged relationship about the hinge pin.