The Scottish Marine Animal Stranding Scheme (SMASS) has said that it is likely that the plastic had been there "for some time", but added that they couldn't find any evidence of intestine obstruction.
According to a post on the group's Facebook page, they discovered "approximately 100kg of marine debris - a whole range of plastic including sections of net, bundles of rope, plastic cups, bags, gloves, packing straps and tubing".
SMASS researchers and volunteers collect and analyze data on stranded animals that wash up along the Scottish coast, which includes 790 islands and spans almost 12,000 miles (19,000 kilometers), according to the SMASS website.
However, it noted that the animal didn't appear to be in bad shape.
Inside the whale was a condensed mass of fishing debris and land trash.
Several bunches of rope were dug from the innards of the dead whale.
Both the Coastguard and the Western Isles Council's disposal team helped the organization bury the whale following their autopsy.
"We also now have research to suggest that the majority of plastic enters the ocean from a small geographic area, and that over half comes from just five rapidly growing economies-China, Indonesia, the Philippines, Thailand, and Vietnam", it said in a report published in 2018.
When the SMASS group reached the massive animal, the majority of its guts blew out of its side whilst the necropsy was undertaken. But beached animals with quantities of large debris in their bellies are rare in the coastal U.K., SMASS Stranding Coordinator Nick Davison told Live Science. "It is also perhaps a good example that this is a global issue caused by a whole host of human activities".
Parry, who says on Facebook that he walks along the beach each day, picking up litter, wrote in a post: "Debris in our oceans is everyone's problem-the fishing industry need to do better, but equally, we all need to do more". "We are looking in more detail to see if we can work out quite why this animal ended up with so much of it in its stomach".