Lamprey are an ancient, eel-like fish that can migrate from the ocean up to 2000 kilometres along the River Murray to breed.
As the lamprey are moving through fishways, they are being tagged with microchips to help us learn more about their movement and solve the mystery of where they spawn, as well as help inform how the river is managed to better support these fish.
Record numbers of lamprey are making the journey this year and their migration is being tracked by scientists at the South Australian Research and Development Institute (SARDI). You can also follow their progress.
Click on the image to see how Larry is tracking
Lamprey monitoring is funded by The Living Murray, a joint initiative funded by the New South Wales, Victorian, South Australian, and Commonwealth governments and coordinated by the Murray–Darling Basin Authority.
Fast Facts on Larry the Lamprey
- Lamprey are an ancient, eel-like fish that have been around for about 360 million years.
- Born in fresh water, they move to the sea as young adults where they spend much of their life before returning to fresh water to breed, lay eggs and then die.
- In the ocean, lamprey feed parasitically on host fish or whales whereby they attach their suction-like mouths onto the side of their host, use their tongue to scrape away scales and skin and suck the host’s blood.
- When lamprey start their spawning migration up the River Murray they change their internal organs, investing in their reproduction system rather than digestive system and in doing so, stop feeding.
- To kick start their migration up the River Murray, lamprey at sea need a freshwater signal. Freshwater flows carry the smell of pheromones to help them identify productive breeding habitat and coordinate breeding behaviour.
- Lamprey can migrate thousands of kilometres to breed, which is why it’s really important that the entire river is connected through things like fishways at locks and weirs.
- Even though lamprey have been around for millions of years, and are native to the River Murray, we’re still not sure where they breed in the Murray-Darling Basin.
- While they may look scary they are not dangerous to people or animals in the River Murray, they only have one thing on their mind once they start their journey up river and it’s not food!