The remaining portions of the base were developed as Port San Antonio, an industrial/business park and aerospace complex. San Antonio is home to six Fortune 500 companies and the South Texas Medical Center, the only medical research and care provider in the South Texas region.
1 The giant manta ray is the largest ray species in the world. 2  The giant manta ray has the largest brain of all the worldâs fishes, and much remains to be discovered about its intelligence and social interactions. 3  Despite its massive size, the giant manta ray feeds on some of the smallest organisms in the ocean.
Conclusion Rays are present in most marine ecosystems worldwide, and have a vital role in maintaining the health and function of these ecosystems. Their ecological niche has been little-studied when compared to sharks, but their diversity, abundance and worldwide distribution are evidence of their success.ays and skates are the most diverse of the cartilaginous fishes. There are around 600 species worldwide. These range from the gigantic manta rays, with a âwingspanâ of over six metres, right down to skates the size of a personâs hand.