Last night we were having a leisurely late dinner at Clyde's Drive-in. After a day of working in the yard, it sounded like a fun way to end our day. Just as we finished eating a tank truck pulled in and backed down a ramp to the river. The young man was very open to our questions and even let me climb up on the truck to take pictures of the tanks full of lamprey.
You can read about the lamprey problem in the St. Marys River at several web sites.
Lamprey Control in the St. Marys River
Lamprey Control Fact Sheet
Here is an explanation of the program that we saw in action last night.
SUPPRESSING LONG-TERM SPAWNING
SUCCESS. Male sea lampreys are trapped, sterilized,
and released into the St. Marys River. The
sterilized males compete as aggressively as normal
males, wasting the spawning potential of female sea
lampreys. The sterile-male-release-technique reduces
sea lamprey spawning success over the long-term.