writing assignment about captivation of killer whales

The essay link is       http://www.pbs.org/wgbh/pages/frontline/shows/whales/etc/orcas1.html

It is suppose to be double space , 5 pages and APA format . 

What is the economic impact in this case ? and one real life example need to be given ( it can be sea World case, refer the link below )

What is the main purpose keeping animal in captivity? Is it financial aid or nonprofit welfare ?

Since this is a law course everything has to be explained according to the law. 

 Sea World Case

http://blogs.scientificamerican.com/thoughtful-animal/2011/10/27/killer-whales-

in-captivity-not-a-13th-amendment-problem/