TCoT+Dead+Manatees

Dr Haledjian got a call from Marty Fisher about 12 shot endangered manatees. Fisher told Haledjian that it was 12 am when he was on the beach night fishing, it was particually cold that night so he didn't expect to catch anything. He explained that he saw some gray endangered manatees in the water near the shore. He told Haledjian that he saw some big ones and some small ones so he knew that the mothers and their new borns had come up for a rest. He explained to Haledjian that in order to not catch the young manatees he moved away from that sport so that he would not catch them because he knew that they were endangered. He told Haledjian the soon after the had moved away from that sport he heared 12 gunshots. When he looked at the manatees they were dead, he concluded.

"Mr. Fisher, you are arrested for shooting the 12 manatees," said Haledjian.

How did Haledjian know? :-) :-( :p