When Do Barnacles Affect Whales?

They don't harm the whales or feed on the whales, like true parasites do. Barnacles don't serve any obvious advantage to the whales, but they give helpful lice a place to hang onto the whale without getting washed away by water. Barnacles find the slow-swimming gray whale

gray whale
Traveling night and day, the gray whale averages approximately 120 km (75 mi) per day at an average speed of 8 km/h (5 mph). This round trip of 16,000–22,000 km (9,900–13,700 mi) is believed to be the longest annual migration of any mammal.
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a good ride through nutrient-rich ocean waters.

Do whales scrape off barnacles?

As the whale travels through the ocean, the barnacles extend their filtering baskets and sea water passes through trapping microorganisms for them to eat. Sometimes gray whales scrape off the barnacles by rubbing on underwater rocks. This leaves a white scar which gives these whales a mottled gray color. Now you know!

Do barnacles grow on humpback whales?

You will often see photos of Humpback whales with clusters of what look like white/brown shells. These are in fact barnacles. It is believed that adult Humpback whales can have up to a 450kg of them on their bodies- that's a lot of free riders!

Marcus Vance

Marcus Vance

Cybersecurity & Digital Privacy Researcher

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.