Ruqayyah Snyder
Blue whales are the largest animals ever known to have lived on Earth, capable of growing over 30 metres long and weighing over 100 tonnes. They are also one of the loudest species, communicating with each other over hundreds of kilometres. Despite their size, blue whales are rarely seen close to shore and are therefore difficult to find in some parts of Australia. In fact, there have been only six verified sightings of the pygmy blue whale off Sydney in the last 18 years. However, blue whales are indeed found in Australian waters, and they are a focus of conservation efforts in the country.
| Characteristics | Values |
|---|---|
| Blue whale population in Australia | Pygmy blue whales are found in southern and western Australian waters. |
| Migration patterns | Blue whales migrate to cold waters to feed and then to warmer waters to breed. |
| Feeding grounds | Perth Canyon, Western Australia, and between the Great Australian Bight and Bass Strait. |
| Feeding habits | Blue whales feed on krill, consuming up to 40 million krill per day or 3,600 kg of krill. |
| Size | Pygmy blue whales can grow up to 24-25 meters in length. The Antarctic blue whale, found in Australian waters, can reach around 33 meters. |
| Weight | Pygmy blue whales can weigh up to 100 tonnes. |
| Conservation status | Blue whales are classified as Endangered by the IUCN Red List. |
| Threats | Ship strikes, chemical and noise pollution, bycatch, climate change, and oil and gas exploration. |
| Conservation efforts | WWF-Australia is working to protect 30% of shared oceans by 2030 and connect networks of Marine Protected Areas (MPAs) for safe passage. |
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What You'll Learn
Blue whales are rarely seen close to shore
Blue whales are the largest animals ever known to have lived on Earth. They are highly endangered, with only a small fragment of the original population surviving today. In the past, whaling decimated their numbers, and now they face a growing number of threats from human activity, including ship strikes, noise and chemical pollution, bycatch, and climate change.
Blue whales are indeed found in Australia, with the pygmy blue whale being one of two blue whale subspecies that occur in Australian waters. The other is the Antarctic blue whale, the largest whale of them all, reaching around 33 metres in length. The pygmy blue whale is no less impressive, growing up to 24 or 25 metres in length and weighing up to 100 tonnes. Despite their size, blue whales are rarely seen close to shore. They prefer to live in deep ocean waters and are capable of swimming thousands of kilometres in search of food and breeding grounds.
In Australia, blue whales are known to feed in the Great Southern Australian Coastal Upwelling System (GSACUS) during the summer months. They spend their summers gorging on krill in the cold polar seas of the Antarctic before heading north to warmer tropical waters to breed and escape the harsh winter. In Western Australia, blue whales feed in the Perth Canyon and between the Great Australian Bight and Bass Strait. They have also been spotted off the coast of Sydney, though sightings are rare.
The elusive nature of blue whales makes them difficult to study. They can hold their breath for up to 90 minutes underwater, and their enormous size means they can be hard to spot unless they're near the surface. To learn more about blue whales in Australia, marine scientists have developed various techniques, including listening to whale vocalisations, taking skin samples, and satellite tagging.
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They are found in the Perth Canyon, Western Australia
Blue whales, the largest animals ever known to have lived on Earth, are indeed found in Australia. They are an endangered species, with only 12,000 to 20,000 remaining around the globe and less than 2,000 in Australian waters. They are highly elusive, capable of swimming thousands of kilometres for food and breeding, and can hold their breath underwater for up to 90 minutes.
In Western Australia, blue whales are known to feed in the Perth Canyon during the summer months, particularly from March to May. The Perth Canyon is a marine epicentre located about 30 nautical miles off the coast of Perth. It is larger than the Grand Canyon and is a pristine eco-hotspot with origins dating back to the entrance of the Swan River in Perth. The nutrient-rich Leeuwin Undercurrent creates an abundant feeding ground for various marine life, including blue whales, which feed on krill.
The opportunity to witness blue whales in their natural habitat is a rare and exciting experience, offering a chance to contribute to research and conservation efforts. Whale-watching tours in Western Australia provide visitors with the thrill of encountering these majestic giants, contributing to a generational memory.
Blue whales are known to migrate through southern and western Australia and West Timor, with presumed breeding grounds in Indonesia. They are also found in the Great Southern Australian Coastal Upwelling System (GSACUS) during the austral summer, particularly between the Great Australian Bight and Bass Strait.
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Blue whales are endangered due to historical whaling
Blue whales, the largest animals ever known to have lived on Earth, are an endangered species due to historical whaling. They are found in every single ocean except the Arctic Ocean. In Australia, they are known to feed in the Great Southern Australian Coastal Upwelling System (GSACUS) during the summer. They spend most of their time over the continental shelf and are likely to forage in association with several seascape variables such as sea surface temperature and depth.
Historical whaling in the 1800s and early 1900s drove blue whales to extinction, causing their population to decline significantly. The growing industrial age and increasing dependency on oil, along with advances in technology and boating, made it easier for whalers to hunt, kill, and capture these mammals. The lucrative business of whale blubber and oil further fuelled competition in the international whaling market. As technology and hunting equipment evolved, the rate at which blue whales were being killed increased, leading to a decline in their population.
In 1931, international agreements were established to minimise whale killings and aid in the recovery of endangered species, including blue whales. The whaling industry was monitored and hunting efforts were limited by organisations such as the International Whaling Commission. Despite these efforts, blue whales remain endangered today due to historical whaling practices.
In Australia, pygmy blue whales are a "data deficient" animal, with only a few verified sightings off the east coast in Sydney. They are known to occur mainly along the west coast of Australia and migrate through southern and western Australia to breeding grounds in Indonesia. The more data and information scientists have about pygmy blue whales, the better they can assess their conservation needs and protect this endangered subspecies.
Today, blue whales continue to face man-made threats such as entanglement in fishing gear, vessel strikes, ocean noise, habitat degradation, ocean pollution, and the impacts of climate change. These threats further endanger the species and hinder their population recovery. Conservation efforts and protection of blue whales are crucial to ensure the survival of these majestic creatures.
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They migrate to cold waters to feed, then to warmer waters to breed
Blue whales are the largest animals ever known to have lived on Earth. They are bigger than the biggest dinosaurs and can grow over 30 metres long, weighing over 100 tonnes. They are also one of the loudest animals on the planet, communicating with each other across hundreds of kilometres of ocean. Despite their size, blue whales are elusive creatures, making them hard to find in some parts of the world, including Australia.
In Australia, blue whales are predominantly found along the west coast, with rare sightings off the east coast. They are known to feed in the Great Southern Australian Coastal Upwelling System (GSACUS) during the summer months. Here, they spend most of their time over the continental shelf, foraging for krill in association with several seascape variables, including sea surface temperature and depth.
Blue whales are migratory creatures, travelling thousands of kilometres annually between their feeding and breeding grounds. They migrate to cold, nutrient-rich waters in search of food and then to warmer waters to breed and give birth. This migration pattern is driven by the availability of food, with blue whales feeding on krill, tiny shrimp-like crustaceans that are found in dense swarms in cold waters. During the summer feeding season in polar regions, a blue whale can consume up to 4-6 tons of krill per day, building up fat reserves for their long migrations.
In Australia, blue whales have been observed feeding in the Bonney Upwelling region, between the Great Australian Bight and Bass Strait from late spring to autumn. They are also known to feed in the Perth Canyon, Western Australia, during the summer months. As winter approaches, blue whales migrate to warmer, tropical waters to breed. While the exact breeding grounds of Southern Hemisphere blue whales are unknown, they are thought to be located in the deep oceanic waters of the tropical South Pacific, Atlantic, and Indian Oceans.
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Human activities threaten blue whales in Australia
Blue whales, the largest animals ever known to have lived on Earth, are under constant threat from human activities in Australia. These majestic creatures, with their long, streamlined shapes and mottled blue or grey backs, are sadly endangered. While they are rarely seen close to shore, human activities in the ocean continue to pose significant risks to their existence.
One of the primary threats to blue whales in Australia is commercial whaling, which has pushed their population to the brink. Before the International Whaling Commission banned commercial whaling practices on blue whales in 1966, there were approximately 250,000 blue whales in the world. Today, only a fragment of that population survives, with current estimates ranging from 10,000 to 25,000 individuals. Despite the ban, pirate whaling and the constant push for reprieve from whalers pose a persistent risk to their survival.
Climate change is another critical factor threatening blue whales in Australia. As water levels and temperatures are impacted, the population of krill, the primary food source for blue whales, is decreasing. Antarctica, once a haven for blue whales, is now facing the consequences of climate change, making it harder for these whales to find sufficient food. Additionally, the northern Indian Ocean is fringed by land, limiting the ability of blue whales to move northward into cooler habitats as waters warm.
Human-induced pollution is also a significant concern for blue whales in Australia. The buildup of toxic chemicals from plastic, litter, and oil spills in their systems can compromise the health and fertility of these magnificent creatures. Microplastics, in particular, have been found in over 60% of beached whales, disrupting their reproductive and developmental processes and making them more susceptible to diseases.
Noise pollution is another issue. Blue whales rely on sound to navigate and communicate, and excessive noise from sources like military sonar, oil and gas drilling, and shipping can cause serious disruptions. It can even lead to stranding, further endangering their already fragile existence. Additionally, the noise can disrupt their migration, breeding, and communication patterns, making it challenging for them to locate suitable habitats and reproduce effectively.
Fishing nets and gear also pose a significant threat to blue whales in Australian waters. Trawl nets and static nets hung in the water can accidentally ensnare blue whales, endangering their lives. As blue whales undertake their endless cycle of migration and travel great distances, human activities, especially in major shipping lanes and extensive fisheries, continue to put them at risk.
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Frequently asked questions
Yes, blue whales are found in Australia. In fact, Australia is home to two subspecies of blue whales: the pygmy blue whale and the Antarctic blue whale.
Blue whales are mostly found along the west coast of Australia, particularly in the Perth Canyon, Western Australia, during the summer months. They are also known to feed in the Great Southern Australian Coastal Upwelling System (GSACUS) during the austral summer.
Blue whales migrate every year in search of food and breeding grounds. They spend summers in the Antarctic's cold polar seas before heading north to warmer tropical waters to breed and escape the harsh winter. So, the best time to see blue whales in Australia is during their annual migration in spring and autumn.
