04/06/2026
Titbit Tuesday 🛥️
Knysna Seahorse
An estuary is a body of water where river freshwater mixes with saltwater from the ocean. The most biodiverse estuary in South Africa is the Knysna Estuary. Out of all the various species of marine life in the estuary, there is one that truly stands out.
The Knysna Seahorse is the only fully estuarine seahorse species in the world, meaning it lives its entire life cycle in an estuary. Unlike other seahorses, the Knysna Seahorse cannot live in any other body of water.
The Knysna Seahorse body is covered by bony plates which look like scales. They can change their colour to blend in with their surroundings as camouflage against predators. Interesting fact, the males are the ones that carry the offspring during pregnancy.
Seahorses are very poor swimmers. They do not have a tail fin and use tiny fins on the sides of their body to hover along.
Habitat: 🏝️
The Knysna Seahorse only lives in estuaries, making its habitat range very limited. Their long tails are used to latch onto eelgrass to protect themselves from strong currents, as well as to navigate through the estuary like a monkey that uses its tail to swing from branch to branch.
Eelgrass is extremely important to the Knysna Seahorse because it provides shelter, protection, and a place for them to anchor themselves in the water.
Why are they Endangered:
Due to the Knysna Seahorse only living in estuaries, their habitat range is very limited, meaning they are easily affected by changes and threats in their environment.
Due to their limited area, if pollution, floods, or another specific threat targets them, they have a very high risk of becoming extinct because there is very little they can do to protect themselves.
Due to the strong currents and their poor swimming ability, they get tired very easily, which is another factor that makes it difficult for them to survive harsh conditions.
How to See Them: 🤿
Knysna Seahorses are extremely difficult to spot in the wild because they are small, well camouflaged, and spend much of their time attached to eelgrass below the water’s surface.
The best chance of seeing them is along the docks on Thesen Island as-well as nearby the Knysna heads, where they naturally occur. However, because they are endangered and protected, they should never be disturbed or removed from their habitat.
