Ruqayyah Snyder
The Australian sea lion (Neophoca cinerea) is a species of sea lion that is the only endemic pinniped in Australia. They are quite agile on land and use their front flippers to support themselves. Their back flippers help them to 'walk' on land and act as a rudder to steer when they are in the water. They are known to be very social animals and when not feeding at sea, they spend time resting and sunbathing on sandy beaches and rocks. So, what do they eat?
| Characteristics | Values |
|---|---|
| Diet | Sea lions are opportunistic feeders and have been known to eat seabirds. They hunt mainly on the sea floor and eat cuttlefish, mullet, small rays, octopus, sharks, rock lobster, and seabirds. |
| Feeding Range | Male sea lions will travel up to 100 km and females up to 70 km from their breeding colony. |
| Feeding Behaviour | Sea lions are bottom feeders and spend 58% of their time at sea diving. They demonstrate a high field metabolism, which allows them to maximise their time spent at or near the benthos. |
| Human Impact on Diet | Human activities, particularly gillnet and cray pot fisheries, pose a significant threat to sea lions. They can become entangled in fishing gear and debris, leading to drowning and injury. |
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What You'll Learn
Sea birds are eaten by Australian sea lions
Australian sea lions (Neophoca cinerea) are the only endemic pinnipeds in Australia. They are large carnivorous animals with very large teeth. They are quite agile on land, using their front flippers to support themselves and their back flippers to 'walk'. They are very social and spend time resting and sunbathing on sandy beaches and rocks when not feeding out at sea.
Australian sea lions are opportunistic feeders, and while they mainly hunt on the sea floor, they are known to eat seabirds. They are bottom feeders and eat cuttlefish, mullet, octopus, rock lobster, and small rays. They do not usually catch surface-dwelling animals such as penguins. When feeding, male sea lions will travel up to 100 km, and females up to 70 km from their breeding colony. These trips average about three days, and in that time, a sea lion will dive 900-1200 times.
The total population of Australian sea lions is less than 12,000, with 85% in South Australia and the remaining 15% in Western Australia. Their conservation status is listed as endangered, and they are considered 'in need of special protection'. Their breeding cycle is unusual, with a gestation period of up to 14 months, the longest of any pinniped.
The biggest threat to Australian sea lion colonies is gillnets, which are invisible, thin mesh nets used by commercial fisheries to capture sharks. Sea lions get snagged in the mesh and drown. Other threats include human disturbance, pollution, overfishing, and being struck by boats.
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Octopus is a food source for Australian sea lions
Australian sea lions are opportunistic feeders, hunting mainly on the sea floor. They are known to eat seabirds, but their diet primarily consists of sea-floor-dwelling creatures such as octopus, cuttlefish, small rays, mullet, and rock lobster.
Octopuses are, therefore, a significant food source for Australian sea lions. Sea lions hunt for octopus on the sea floor, where they spend 58% of their time diving. The typical Australian sea lion exceeds its calculated aerobic dive limit on 79% of dives, demonstrating their commitment to hunting in these habitats.
Octopus is a nutritious food source, providing sea lions with essential nutrients such as protein and various vitamins and minerals. The high levels of nutrient-cycling and transport genes found in the faeces of Australian sea lions indicate their ability to efficiently break down and absorb the nutrients from their food sources, including octopus.
While octopus is a valuable food source for Australian sea lions, it is important to note that young and naive sea lion pups may be vulnerable to the deadly blue-ringed octopus. This species of octopus is one of the most poisonous and deadliest cephalopods, and curious pups may inadvertently come into contact with them, resulting in fatal consequences.
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Australian sea lions hunt sharks for food
Australian sea lions (Neophoca cinerea) are the only endemic pinnipeds in Australia, with a population of around 12,000 individuals. They are listed as "in need of special protection" under the Wildlife Conservation Act of Western Australia (1950) and are considered endangered.
These marine mammals are opportunistic feeders, hunting mainly on the sea floor rather than catching surface-dwelling animals. They feed on cuttlefish, mullet, octopus, rock lobster, and small rays. Interestingly, they have also been known to eat seabirds and even sharks.
While adult Australian sea lions can fall prey to great white sharks and orcas, they are known to hunt smaller shark species. This is particularly notable given that sea lions are often victims of human activities, such as gillnet and cray pot fisheries, which can lead to accidental entanglement and drowning. In fact, fisheries that target sharks pose a significant threat to sea lion colonies, as these fisheries often overlap with the sea lions' foraging habitats.
To address this issue, measures have been implemented to protect sea lion colonies. For example, the areas surrounding breeding colonies are now closed to gillnet fishing, and fishing boats operating near these areas are required to have cameras onboard to monitor their activities. These efforts have led to a significant reduction in sea lion bycatch mortality, helping to stabilize the decline in sea lion populations.
In summary, Australian sea lions are versatile predators that can hunt and consume various prey, including sharks. While they must navigate threats from larger sharks, they also play a crucial role in maintaining the balance of their marine ecosystems.
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Rock lobsters are eaten by Australian sea lions
The typical Australian sea lion exceeds its calculated aerobic dive limit on 79% of dives. They spend 58% of their time at sea diving and have a high field metabolism, which allows them to maximise their time spent at or near the benthos. This means that they spend a significant amount of time in the deeper parts of their diving range. Australian sea lions are quite agile on land, using their front flippers to support themselves and their back flippers to 'walk'.
The breeding cycle of the Australian sea lion is unusual within the pinniped family. It is a long cycle, ranging from 17.6 to 18 months, and it is not synchronised between colonies. The gestation period is up to 14 months, the longest of any pinniped. The breeding season can last from five to seven months, and during this time, dominant males guard females and fight other males for the right to breed.
Australian sea lion colonies are currently threatened by human activities, particularly gillnet and cray pot fisheries. Sea lions have been observed foraging in crayfish and lobster pots, sometimes becoming trapped and drowning, and they also become entangled in gillnets. The areas around sea lion breeding colonies are now closed to gillnet fishing, and fishing boats must have cameras on board to monitor what is being caught. This has helped to reduce sea lion bycatch mortality and stabilise the decline in sea lion pup abundances.
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Cuttlefish and rays are also on the menu
Australian sea lions are opportunistic feeders, and while they primarily hunt on the sea floor, they are also agile on land, using their front flippers to support themselves and their back flippers to 'walk'. They are quite social and spend time resting and sunbathing on sandy beaches and rocks when they are not feeding.
The typical diet of an Australian sea lion includes cuttlefish, which are found in abundance in their coastal habitats. Cuttlefish are cephalopods, closely related to octopus, and are a good source of nutrition for sea lions. They are also known to eat small rays, which can be found in the same coastal areas.
However, hunting rays can be dangerous for young and naive sea lions, as they may be stung and killed by stingrays. Sea lions need to be cautious when hunting these creatures, as their curiosity can lead them into dangerous situations.
Overall, cuttlefish and rays are an important part of the diet of Australian sea lions, who are skilled and opportunistic hunters in their coastal ecosystems.
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Frequently asked questions
Australian sea lions are opportunistic feeders, hunting mainly on the sea floor. They eat cuttlefish, mullet, small rays, octopus, sharks, rock lobsters, and seabirds.
Australian sea lions are endemic to Australia and are found in Western Australia and South Australia. Their breeding range extends from the Houtman Abrolhos Islands in Western Australia to The Pages Islands that lie east of Kangaroo Island in South Australia.
The population of Australian sea lions is estimated to be between 11,200 and 14,730 individuals, spread among 66-67 breeding colonies.
The biggest threat to Australian sea lion colonies is gillnets, which are thin mesh nets suspended in the water used by commercial fisheries to capture sharks. Australian sea lions get snagged in the mesh and drown. Other threats include human disturbance, pollution, overfishing, and being struck by boats.
Yes, Australian sea lions can be dangerous. They are large carnivorous animals with very large teeth and have been known to exhibit defensive behavior, including biting.
