22/11/2023
Anne Scott, an assistant professor at Michigan State University, and her team of researchers are creating a new method of sea lamprey control using a newly discovered chemical compound, petromyzonol tetrasolfate – also known as 3sPZS.
It is very similar to a pheromone that male sea lampreys release in rivers and streams before breeding. The natural pheromone attracts females ready to breed to the males’ nests. But when 3sPZS is released into a river system, females can’t find the nests and are unable to breed, Scott said.
A long process lies ahead for the researchers before this new method can be used. Efficacy tests, like those that prescription drugs must undergo and trial applications in diverse river systems are the next steps of this journey.
The tests are promising and the new compound seems both safe and effective, Scott said. It will naturally break down in the water and due to its similarity to the naturally occurring pheromone, it only influences the invasive sea lamprey.
Sea lampreys are invasive parasitic eel-shaped fish that have been present within the Great Lakes for over 100 years. They latch on to the sides of fish with their suction cup-shaped mouth, pierce fish’s skin with their tongue, and after secreting a blood-thinning enzyme, drain the fish’s fluids. In the Great Lakes and surrounding water bodies, sea lampreys kill 40 to 60 percent of their hosts. This can translate to over 40 pounds of fish killed per lamprey.
https://greatlakesecho.org/2023/11/22/new-compound-may-expand-sea-lamprey-control/