Human activity has compromised the blue whale habitats in Sri Lankan waters. Here’s what is being done about it.
Blue whale. U.S. Embassy New Zealand. CC0 1.0.
Though blue whales are the largest animal species on Earth, their population has been shrunk by human activity. There are an estimated 10,000 to 25,000 blue whales left on Earth, compared to a population of at least 100,000 just a century ago. A traditional hotspot for these endangered gentle giants is the northern Indian Ocean, in Sri Lankan waters. Human actions, such as fishing and shipping, have contributed to the death of blue whales in this area, pushing this species ever closer to extinction. Here are some ways that humans have negatively impacted the blue whale population, as well as some potential solutions.
Pollution
Microplastic. Oregon State University. CC BY-SA 2.0.
Pollution, particularly of microplastics, has contributed toward the decrease in the blue whale populations. As their name suggests, microplastics are tiny pieces of plastic that are created when larger objects break down, or are manufactured at tiny sizes for beauty products such as face scrubs. Krill often consume this type of debris, and are themselves food for whales in huge quantities. Because of the enormous amount of krill they eat, filter feeding baleen whales may consume about 10 million pieces of microplastic per day, equivalent to about 96 pounds of plastic. Blue whales in Sri Lankan waters are especially vulnerable to plastic pollution, as this area is a major shipping lane and microplastics are used in product packaging, leading to an increased risk of exposure. Though the mechanisms by which microplastics harm whales are still under investigation, they can carry toxic materials, which may be a contributing factor toward increased blue whale mortality.
Entanglement
Marine organisms caught in fishing nets. Martin Stelfox. CC BY-SA 4.0.
Whales can get entangled in fishing gear, resulting in injuries and infections. Whales may also carry around tangled fishing nets for years, making it more difficult for them to swim and feed,and leading to exhaustion. It has been found that about 300,000 whales and dolphins die from entanglement every year. Entanglement is one of the leading causes of death for blue whales in Sri Lanka.
Shipping Accidents
Ships in Sri Lankan waters. NZ Defence Force. CC BY 3.0 NZ.
The northern Indian Ocean contains a major shipping lane, and this lane happens to be a large feeding ground for blue whales. Due to the overlapping use of this area by boats, many blue whales have been killed in collisions with ships. Within the last decade, there has been an increase of shipping traffic by 300 percent, with more than 200 ships using the lane in Sri Lankan waters per day. There are differing estimates on the number of whales killed by ships, but it is suggested that as many as 56 whales die this way each year.
Resolutions
Whale disentanglement training. Nicole Capps. CC0 1.0.
Change of Shipping Routes
There are currently efforts to relocate Sri Lanka’s shipping lanes to decrease harm done to whales. It has been found that by directing ships 15 miles south of the current route, 95 percent of whale fatalities in the area may be avoided. Organizations such as International Fund for Animal Welfare (IFAW), the International Maritime Organization (IMO), and OceanCare have requested changes in this shipping route. The major shipping corporation, MSC Group, has agreed to move these routes south in order to benefit the blue whale population. Although this action has now been approved, it was previously rejected by the former Sri Lankan government due to economic concerns.
Entanglement Response
There are current international efforts to save whales that have been entangled in fishing nets. The International Whaling Commission (IWC), which regulates whale hunting and preservation globally, provides training workshops on disentanglement, reaching over 1300 government representatives, scientists and conservationists globally. The Center for Coastal Studies also has a “Disentanglement Network,” where trained response teams visit popular whale feeding and calving areas to assist any possible whales-in-need.
Addressing Microplastic
The Whale and Dolphin Conservation, Environmental Investigation Agency, Humane Society International and OceanCare recently got the European Union push for the IWC to prioritize plastic pollution in its conservation efforts. The motion received consensus approval; all votes were in favor. Individual efforts against the use of plastic can help reduce its prevalence in the ocean, such as taking small measures like recycling, using reusable products instead of single-use, and avoiding beauty products that contain microplastic beads.
TO GET INVOLVED
Click here to donate to the International Fund for Animal Welfare.
Click here to donate to Marine Life Studies.
Click here to donate to Greenpeace.
Alexandra Copeland
Alexandra Copeland is a student at The College of New Jersey studying psychology and journalism. She is a lover of coffee, dancing, and visiting new places. Being raised with her Greek culture has inspired her interest in cultural customs around the world. She is a passionate writer and hopes that her work will make an impact in the future.