Larval Population Assessment Marquette Biological Station staff
assesses the presence, distribution, abundance and size
structure of larval sea lampreys in Great Lakes tributaries and
lentic areas located in Michigan’s Upper Peninsula, Wisconsin
and Minnesota. Larval sea lamprey populations are assessed in
most streams with backpack electrofishers. A granular lampricide
is used to assess larval populations in streams and lentic areas
greater than 1.0 m in depth. Data are used to rank and prepare
streams for lampricide treatment. Sea Lamprey Control Marquette
Biological Station staff control larval sea lamprey populations
by applying federally registered lampricides to infested streams
and lentic areas in the Great Lakes. Prior to each treatment,
water discharge and chemisty data are collected and used to
determine the appropriate concentration and duration of
lampricide to apply. Lampricide concentrations are closely
monitored in each stream to ensure larval sea lamprey
populations are destroyed and non-targe