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Dead whale found on Kauaʻi had fishing nets, plastic bags in its stomach

beached whale kauai 012823 DLNR
An excavator tries to move a 56-foot-long, 120,000-pound sperm whale that washed up at Lydgate Park on Kauaʻi. (Jan. 28. 2023)

A whale that washed ashore on Kauaʻi over the weekend likely died in part because it ate large volumes of fishing traps, fishing nets, plastic bags and other marine debris, scientists said Thursday, highlighting the threat to wildlife from the millions of tons of plastic that end up in oceans every year.

The body of the 56-foot (17-meter) long, 120,000-pound (54,431-kilogram) animal was first noticed on a reef off Kauaʻi on Friday. High tide brought it ashore on Saturday. The whale has been removed and buried.

Kristi West, the director of the University of Hawaiʻi's Health and Stranding Lab, said there were enough foreign objects in the opening of the whale's intestinal tract to block food.

“The presence of undigested fish and squid lends further evidence of a blockage," she said in a news release from the Hawaiʻi Department of Land and Natural Resources.

The whale's stomach contained six hagfish traps, seven types of fishing net, two types of plastic bags, a light protector, fishing line and a float from a net.

Researchers also found squid beaks, fish skeleton and remains of other prey in the whale's stomach.

Foreign bodies fishing supplies found in sperm whale 012823
Courtesy UH Health and Stranding Lab)
Researchers at UH Mānoa found various fishing gear inside the stomach of a dead sperm whale that washed up on Kauaʻi. (Feb. 1, 2023)

It’s the first known case of a sperm whale in Hawaiʻi waters ingesting discarded fishing gear, West said.

The whale's stomach was so large West's team wasn't able to examine it completely. They suspect there was more material they weren't able to recover.

Researchers found nothing wrong with other organs they examined. They collected samples to screen for disease and conduct other follow-up tests.

Sperm whales travel thousands of miles in the ocean so it’s not clear where the debris came from.

Dr. Kristi West, the Health and Stranding Lab Director
Dr. Kristi West, the Health and Stranding Lab director, examines material found in the whale's stomach.

Scientists say that more than 35 million tons (31.9 million metric tons) of plastic pollution is produced around Earth each year and about a quarter of that ends up around the water.

Marine debris harms numerous species.

Seabirds can ingest as much as 8% of their body weight in plastic. Endangered Hawaiian monk seals and green sea turtles can get caught in plastic nets and die. Sharks and other apex predators eat smaller fish that feed on microplastic, which can then endanger their own health.

In addition to eating plastics, large whales are harmed when they become entangled in fishing gear or other ropes in the ocean. The drag from debris can force whales to use more energy to swim and make it harder for them to eat, causing starvation.

On Tuesday, marine mammal responders freed a humpback whale that was caught in rope, a bundle of gear and two buoys off the Big Island.

Sperm whales are an endangered species found in deep oceans across the world. A 2021 report from the National Oceanic and Atmospheric Administration estimated there were about 4,500 sperm whales in the waters around the Hawaiian Islands, from the Big Island in the south to Kure Atoll in the north.

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