To protect and preserve the rich marine biodiversity within its coastline, the Hijo Resources Corporation (HRC) and the local government unit (LGU) of Tagum City, through its City Environment and Natural Resources Office (Cenro), inked a memorandum of agreement (MOA) declaring the Hijo Estate coastline as a Marine Protected Area (MPA). The Hijo Estate coastline, located in Barangay Madaum, Tagum City, is part of the Davao Gulf. The MOA, which was signed on October 27, 2020, signifies the shared responsibility of both parties in actively protecting and conserving the marine life nesting in the Hijo coastline. The collaboration also involved the Department of Science and Technology (DOST).

Perez, A. J. R. S. (2020, November 21 - 22). Hijo Estate coastline now a Marine Protected Area. SunStar Davao, p. 10.