COLOMBO/MANDAPAM — It was a calm October night over Sri Lanka’s northern seas, the silence broken only by the sound of a rapidly approaching motorboat from India. In Kalpitiya, a town further down the island’s western coast, it rendezvoused with a truck waiting on the beach. Also waiting there was a Navy patrol team, which seized the illegal consignment of 1,196 kilograms (2,637 pounds) of dried sea cucumbers worth more than 16 million Sri Lankan rupees (nearly $80,000); authorities also arrested two trafficking suspects. The previous month, on Sept. 19, the Indian Coast Guard made a similar a…