Just to expand on Alexandra's post, there are usually 4 or 5 groups in the lagoon. The lagoon is designed to have 4 or 5 smaller "bays" , each bay will have one group of 6-8 people and one dolphin. so in total there would be 4 or 5 dolphins ( I think they have a total of about 12-15 dolphins at DC and rotate them), about 30-40 people plus 8-10 "trainers" and 5 photographers.