Spherical Universe for tuna

I saw in the paper today a business that has plans to set up a tuna farm in the open ocean in Hawaii. The farm will have 12 cages in the shape of the spherical meridian flow. 20,000 tuna can live in one cage. Each tuna will weigh 100 pounds at harvest.
Why use the spherical shape? It is the most efficient and strongest design  possible.
The tuna will live in a small universe. Some scientists have calculated that the boundaries of the universe look the same as you will see in this video link...(at least enjoy the Hawaiian guitar in the video)

http://www.youtube.com/watch?v=76TLGgjQMOc