ORLANDO, Fla. » Multiple SeaWorld employees posed as animal-welfare activists so they could spy on critics, the company admitted today.

The acknowledgment comes seven months after People for the Ethical Treatment of Animals accused SeaWorld of spying. The animal-welfare group, which has waged an intense campaign against SeaWorld, went public with evidence that a San Diego employee attended protests and made incendiary comments on social media while posing as an activist. The employee, who was placed on administrative leave, has returned to work at SeaWorld.

Reading from a statement while speaking with analysts, Chief Executive Officer Joel Manby said SeaWorld’s board of directors has “directed management to end the practice in which certain employees posed as animal-welfare activists. This activity was undertaken in connection with efforts to maintain the safety and security of employees, customers and animals in the face of credible threats.”

The admission comes at a difficult time for the company. SeaWorld on Thursday issued a fourth-quarter earnings report that showed improving attendance and revenue but then told analysts bad weather and a slowdown in Brazilian visitors have hurt attendance this year. Last week, SeaWorld announced a management shakeup that includes the imminent departures of Chief Parks Operations Officer Dan Brown and Chief Zoological Officer Brad Andrews.

“SeaWorld’s latest report confirms not only that the company has employed more than one spy to infiltrate and agitate at PETA but also that it values its spies more highly than the executives who have had their heads chopped off in droves, as at least one of the spies is still working at the company,” PETA said in an emailed statement.

SeaWorld’s business has suffered in the wake of the 2013 “Blackfish” documentary, which suggested the stresses of captivity caused a killer whale to batter and drown trainer Dawn Brancheau in 2010.

The spying admission “adds in a minor way to their troubles,” said Kirk O. Hanson, executive director of the Markkula Center for Applied Ethics at Santa Clara University.

“Past scandals have resulted in short-term hits to the reputation and economic success of companies,” Hanson said. “I would expect the reaction to this incident to be similar. Unfortunately the incident contributes long-term to a cynicism about the ethics of business in general.”

SeaWorld’s stock was down 11 percent Thursday afternoon. S&P Global Market Intelligence analyst Tuna Amobi said that appeared to be a result of general concerns about the company’s performance, not the spying issue. “I don’t think that sort of stuff would be causing this type of share reaction today,” he said.

SeaWorld hired an outside law firm to conduct an investigation in July, after PETA accused employee Paul McComb as attending their events posing as an activist named Thomas Jones. PETA’s suspicions were raised after the man who called himself Jones was arrested with a group of other protesters at the 2014 Rose Parade in Pasadena but unlike the others was released without charges

SeaWorld would not say whether anyone was fired or disciplined as a result of its investigation. A company spokeswoman said SeaWorld had no comment past the statement it has already issued.

“We recognize the need to ensure that all of our security and other activities align with our core values and ethical standards,” SeaWorld’s statement said. “As always the security and well-being of our employees, customers and animals remains at the forefront of our business practices.”

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©2016 The Orlando Sentinel (Orlando, Fla.)