Stories
Leafy Seadragon: The Seaweed-Mimicking Fish Where Males Carry Eggs and Give Birth
- •The Leafy Seadragon is a marine fish found only in Australian waters, known for its remarkable camouflage resembling drifting seaweed.
- •Males carry and protect up to 250 fertilized eggs on a specialized brood patch for four to six weeks before releasing the young.
- •These predators lack teeth and stomachs, swallowing prey whole and feeding continuously on small organisms like mysid shrimp.
- •Their slow movement, around 0.15 km/h, and ability to change color enhance their disguise, making them almost invisible in their habitat.
- •Threats include habitat degradation, pollution, illegal collection, and climate change, leading to declining populations according to the IUCN.
Key Questions Answered
During the breeding season from October to January, the male leafy seadragon develops a specialised brood patch along the underside of his tail where the female deposits up to 250 eggs. The male fertilises the eggs as they are transferred and provides them with oxygen for roughly four to six weeks while they mature.
Leafy seadragons use their long, narrow snouts and tiny mouths like pipettes to create suction, drawing in small prey such as mysid shrimp, sea lice, plankton, and larval fish. Lacking teeth or a conventional stomach, they swallow their prey whole and must feed continuously.
There are three recognised species of seadragon: the leafy seadragon, the weedy or common seadragon, and the ruby seadragon. All three species are found exclusively in Australian waters.
