Blatchley, who is president and founder of D' Bone Collector Museum, a natural history museum in the Philippine city of Davao, said his team received notification on Friday that the carcass of the whale had been found in Mabini, Compostela Valley.
Released on Saturday evening, the result of the necropsy, conducted by Blatchley and Dr. Elaine Vera Belvis of the Bureau of Fisheries and Aquatic Resources (BFAR)-Fishery Management Regulatory and Enforcement Division showed "all stomach compartments were full of foreign materials such as plastics of varying sizes and shapes, sacks, among others".
Detailing the partial contents of the whale's stomach, the museum wrote that 16 rice sacks, 4 banana plantation-style bags and numerous shopping bags were found inside the whale's stomach.
"The most plastic we have ever seen in a whale".
"I was not prepared for the amount of plastic", Blatchley said.
"Upon researching the stomach I knew this whale had died due to plastic ingestion".
Cetaceans, Blatchley explained, don't drink water directly from the ocean but take it from the food they consume.
Blood samples were taken from whale and results showed the whale, which had a "prominent backbone and peanut-shaped head", was dehydrated.
Plastics are one of the most common types of debris found in the ocean, according to the National Oceanic and Atmospheric Administration.
The use of throwaway plastic is a particular problem in some South East Asian countries, including the Philippines.
The founder of D'Bone Collector Museum, Darrell Blatchley, told INSIDER that out of the 61 dead whales they examined over the last ten years, 57 died due to fishing nets, dynamite fishing, and plastic garbage, and four of them were pregnant. A month later, a pilot whale swallowed 17 pounds (8 kilograms) of plastic bags in Thai waters.
A 2017 study predicted a spike in plastic-related waste over the next decade, further highlighting potential future harm to marine life.
"This can not continue", he said.