Harcourt Brace Jovanovich, Inc. (HBJ) purchased the company in 1976 and 12 years later they ventured deep into the heart of Texas. In 1988 SeaWorld San Antonio opened just a few miles outside of San Antonio. Although the climate was more like that of its Ohio counterpart, the park did have a longer operating season. Still, this park was not open year-round like its sister parks in California and Florida. The stress and financial resources it took to build and maintain a state-of-the-art marine mammal facility in the late '80s eventually took its toll on the company.
HBJ, whose primary focus was producing school books, needed to reduce its assets in order to avoid a bankruptcy.
The Anheuser-Busch Company made an offer to purchase the SeaWorld parks. However, HBJ also owned and operated two other parks, Cypress Gardens and Boardwalk and Baseball, and out of fear of not being able to find a buyer for the two other parks HBJ refused to sell the parks individually. Despite a long negotiation, Anheuser-Busch bought all six parks: SeaWorld in San Diego, Aurora, Orlando and San Antonio as well as Cypress Gardens in Winter Haven and Boardwalk and Baseball in Haines City. Soon after the sale was final, Busch sold Cypress Gardens to the park's management and closed Boardwalk and Baseball. Anheuser-Busch put millions of dollars back into the parks to revive and to prolong their longevity
http://en.wikipedia.org/wiki/Seaworld