Identify the cause and effects of the problem. Based on historical evidence, whaling was essentially a subsistence activity for the islanders. However, a limited number of whales were captured each year, and the meat was consumed by the villagers or sold locally in Bohol. Which quickly led to the effective demise of the whale shark population and reduced income for the island's fishing fleet. They will hook whales. Until recently, whale and manta ray fishing were the main sources of income for residents of Pamilican?