Since the other two harbors have 80 pounds of lobsters each, they have a total of 80+80= <<80+80=160>>160 pounds of lobster.
Since Hooper Bay has two times more lobsters than the other two harbors combined, it has 2*160 = <<2*160=320>>320 pounds of lobster.
In total, the three harbors have 320+160 = <<320+160=480>>480 pounds of lobster.
#### 480