The first day he saw 50 oysters + 72 crabs = <<50+72=122>>122 animals.
On the second day, he saw 1/2 * 50 oysters = <<1/2*50=25>>25 oysters.
The number of crabs by the beach on the second day was 2/3 * 72 crabs = <<2/3*72=48>>48
He saw 48 crabs + 25 oysters = <<48+25=73>>73 animals on the second day.
The total for the two days is 73 animals + 122 animals = <<73+122=195>>195 animals
#### 195