Leslie Massey
Seahorses are fascinating creatures that can be found in various locations in Australia. From the sparkling ocean inlet of Port Stephens on the NSW lower north coast, where four species coexist, to the Southern Ocean waters of South Australia, home to the Potbelly seahorse, these unique fish captivate and intrigue. The West Australian Seahorse, a large species endemic to Western Australian waters, can be spotted in sheltered reefs and seagrass areas, while the elusive Red Seahorse hides in deep waters among sponge gardens and black coral. With their slow movement, grasping tails, and armour-plated bodies, seahorses are masters of camouflage, making them a challenge to spot in their natural habitat.
| Characteristics | Values |
|---|---|
| Species | Western Australian Seahorse, Red Seahorse, Short Snouted Seahorse, Short-head Seahorse, Potbelly Seahorse |
| Location | Western Australia, Point Quobba, WA to Shellharbour, NSW, Sydney Harbour, Southern Ocean, South Australia |
| Habitat | Sheltered reefs, seagrass areas, sponge gardens, black coral "trees", seagrass meadows, soft corals, kelp, large estuaries |
| Depth | Up to 10 meters |
| Size | Up to 22 cm |
| Colour | Red, yellow, varies |
| Diet | Crustaceans, plankton |
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What You'll Learn
- The West Australian Seahorse is a large species endemic to Western Australia
- They can be found in sheltered reefs and seagrass areas to depths of 10 metres
- The Short-snouted seahorse is the species most commonly encountered by divers and snorkelers
- Seahorses are slow-moving and rely on camouflage and armour-plated bodies for safety
- Port Stephens is a seahorse hotspot, with four species found there
The West Australian Seahorse is a large species endemic to Western Australia
The West Australian Seahorse, or *Hippocampus subelongatus*, is a large species endemic to Western Australia. This fascinating creature, with its horse-like head, is a true fish, swimming with fins, breathing with gills, and controlling buoyancy with a swim bladder. What sets it apart from other fish are its lack of a tail fin and its prehensile tail, which it uses to grasp objects, much like a monkey or a possum. It also has a bent neck and swims vertically using its tiny dorsal fin for propulsion.
This unique seahorse species is found only on the west coast of Australia, from Cape Leeuwin to Shark Bay, with a particular affinity for muddy, silty habitats. It typically inhabits waters less than 20 metres deep and can be spotted holding onto sponges, sea squirts, and seaweed. During the summer breeding season, the West Australian Seahorse is most active, favouring places like the Swan River Estuary and Cockburn Sound.
Growing to a length of about 22-25 centimetres, this seahorse species is quite large compared to other seahorse species globally. Its colouration is highly variable, ranging from brown, white, yellow, orange, red, and even purple. Interestingly, they have the ability to change their colour, a skill they use to master the art of camouflage, making up for their slow swimming speed.
The West Australian Seahorse is a protected species, listed under CITES Appendix II, due to its use in traditional Chinese medicine and the potential threat of habitat destruction. It is also listed as data deficient by the IUCN, highlighting the need for further study and conservation efforts. These seahorses are monogamous, with males carrying the unique distinction of getting pregnant. After a series of courtship rituals, the female deposits her eggs in the male's brood pouch, where they are fertilised and nurtured for 2-3 weeks before the male goes through labour.
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They can be found in sheltered reefs and seagrass areas to depths of 10 metres
The Western Australian seahorse is commonly found in sheltered reefs and seagrass areas to depths of 10 metres. Stretching from the proposed Dampier Archipelago Marine Park to the Ngari Capes Marine Park, this area includes the stretch of coastline between Busselton and Augusta. The seahorse is particularly common in the lower reaches of Perth's Swan River, where it uses its prehensile tail to grasp ropes around jetties and moored boats. It is also found in seagrass areas in Cockburn Sound and the nearby Shoalwater Islands Marine Park.
The Western Australian seahorse is a large species, growing up to about 22 cm in length and varying in colour. They are endemic to Western Australian waters, and their range overlaps with that of the short-snouted seahorse (Hippocampus breviceps), which is the seahorse most commonly encountered by divers and snorkelers in South Australia.
Seahorses are slow-moving due to their tiny fins, and they rely on camouflage and their armour-plated bodies for protection. They feed on tiny crustaceans and plankton that drift by, capturing them by quickly opening their mouths and sucking them in.
In addition to Western Australia and South Australia, seahorses are also found in other parts of the country. For example, Port Stephens on the NSW lower north coast is a seahorse hotspot, with four species found there—a phenomenon considered rare worldwide. Seahorses are also occasionally seen in Sydney Harbour during the summer months, among the branches of black coral and feather stars.
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The Short-snouted seahorse is the species most commonly encountered by divers and snorkelers
The short-snouted seahorse, or Hippocampus hippocampus, is the species most commonly encountered by divers and snorkelers in Australia. This is due to its relatively small size, distinct appearance, and the fact that it is found in shallow, muddy waters where people often swim and dive. The short-snouted seahorse has a very distinctive shape, with its head set at an angle to its body. The trunk of its body is short and fat, while the tail is tapering, curled, and prehensile.
This species of seahorse is typically found on the bottoms of rocks, in seaweed, or at the edge of seagrass beds in shallow muddy waters. They are well-camouflaged, with the ability to change colour from brown to orange, purple, or black, sometimes with pale blotches. They can be found in waters that are up to 77 meters deep, though most of their movement occurs when storms displace them with strong currents. They have a very restricted home range due to their limited daily movements.
The short-snouted seahorse is native to the northeastern Atlantic, from northwestern Scotland and the Netherlands, south to Senegal, and into the Mediterranean Sea. They can also be found in the coastal waters of the Azores, Madeira, and the Canary Islands. In Australia, they are found in Port Phillip, Victoria, and are known to frequent the Sydney region and north to Forster, NSW. They are also found in the large ocean inlet of Port Stephens, which is nestled between Nelson Bay and Hawks Nest on the NSW lower north coast.
The short-snouted seahorse is a monogamous species, with male and female pairs forming faithful bonds. They showcase their commitment through their reproductive states and daily greetings, which can last from six to eight minutes. When a male is ready for reproduction, he will pump water in and out of his pouch, and the female will respond by pointing her head towards the water surface. The female will then line up the base of her trunk with the male's pouch, depositing her eggs inside for fertilisation.
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Seahorses are slow-moving and rely on camouflage and armour-plated bodies for safety
The Western Australian seahorse is a large species endemic to Western Australian waters. They are found in sheltered reefs and seagrass areas to depths of 10 metres from the proposed Dampier Archipelago Marine Park to Ngari Capes Marine Park. They are also found in the lower reaches of Perth's Swan River and in seagrass areas in Cockburn Sound and the nearby Shoalwater Islands Marine Park.
Seahorses are slow-moving as their tiny fins are not able to propel them very well. They rely on camouflage and their armour-plated bodies for safety. The pygmy seahorse, for example, is a master of camouflage, blending in with the coral it lives on. Calcium-rich bumps, known as tubercles, cover the seahorses' bodies and help them blend in with the sea fans' polyps. Two colour morphs exist in the wild: yellow seahorses with orange tubercles that spend their days hanging around the similarly coloured Muricella paraplectana, and purple seahorses peppered with pinkish-red tubercles found on the coral Muricella plectana.
The tail of a seahorse can be compressed to about half its size before permanent damage occurs. The tail's exceptional flexibility is due to its structure, made up of bony, armoured plates, which slide past each other. The bony plates are highly deformable materials designed to slide past one another and buckle when compressed. This complex plate and segment motion, along with the unique hardness distribution and structural hierarchy of each plate, provide seahorses with joint flexibility while shielding them against impact and crushing.
The seahorse's armour-plated body protects it from predators, which include sea turtles, crabs, and birds. The armour-plated tail also serves as an anchor, allowing the seahorse to anchor itself to corals or seaweed and hide from predators.
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Port Stephens is a seahorse hotspot, with four species found there
Port Stephens, a sparkling ocean inlet nestled between Nelson Bay and Hawks Nest on the NSW lower north coast, is a seahorse hotspot. It is one of the few places in the world where four species of seahorses can be found. This phenomenon is rare and occurs nowhere else in Australia.
The White's seahorse, an endangered species, used to be abundant in this region. However, over the past decade, their numbers have significantly declined. To restore their population, conservationists have released over 300 White's seahorses, bred in captivity, into artificial habitats called "seahorse hotels" in Port Stephens.
The Red Seahorse, an elusive species rarely photographed in the wild, is generally found in deep waters among sponge gardens and black coral "trees". They travel on the East Australian Current (EAC) and are occasionally seen in Port Stephens during the summer months. This tropical species is recognised by its bent head and red or yellow colouring.
Another species that hitches a ride on the EAC to Port Stephens is the aptly named Thorny Seahorse, characterised by thorny appendages covering its body. This species is endemic to southern Australian waters and is a master of camouflage, often found drifting among kelp.
Port Stephens, with its diverse seahorse population, offers a unique insight into the world of these fascinating creatures and highlights the importance of conservation efforts to protect their delicate marine ecosystems.
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Frequently asked questions
Seahorses can be found in various locations across Australia, including Western Australia, South Australia, New South Wales, and the Southern Ocean.
Seahorses have been spotted in Port Stephens, Sydney Harbour, and the East Australian Current during the summer months. They are also found in sheltered reefs and seagrass areas in Western Australia, as well as in large estuaries in the Sydney region.
The West Australian Seahorse is a large species endemic to Western Australian waters, growing up to about 22 cm in length and varying in color. The Short-snouted seahorse (Hippocampus breviceps) is another species commonly encountered by divers and snorkelers in South Australia.
