St. Marys River

Task ForceReport

St. Marys River Control

The intensive larval assessment work to map the distribution of larval lampreys continued. Initial field and lab trials with the new granular Bayer bottom toxicant were conducted, and plans for the recommended dye flow study continued. In addition, the design for the new adult trap at the Great Lakes Power (GLP) facility was completed and progress continued on the design for improved trapping at at the U.S. Army Corp of Engineers (U.S.C.O.E.) hydroelectric facility. The latest version of the control strategy timeline, with estimated costs is presented in Table 21. The following statements summarize the actions and status of the control options and the information gathering tasks.


Action/Year 95 96 97 98 99+

I. Control Options A. Reduce Reproduction 1. Adult Trapping 41 K 50 KOperate 44 K 50 K Continuing new GLP Trap 2. Sterile Male Release 55 K 65 K Exp. release 67 K Operate 70 K Continuing from other newCOE Trap L. Huron trib 3. Enhanced GLP Trap Const. Design Contruction 100 K Completed 4. Enhanced COE Trap Const. Construction 61 K of 244 K B. Reduce Larval Population 1. Section Bayer Treatment Decide on 1,012 K Finish 75 % coverage option (450 Acres)? in 5 years (7 total)? 2. Section TFM Treatment Decide on Potential to treat option North channel - 1999 at earliest 3. Whole River TFM Treatment Decide on option (Low effectiveness) II. Information Needs 1. Larval & Habitat Mapping 240 K 155.4 K (completion) 2. Index of Larval Abundance 100 K 200 K 206 K 212 K Continuing 3. Ageing/trans. Rates $s in index assessment above 4 TFM Transport Model original project Further development Final Calibration completed 23 K+5 K (Sonar) 25 K 5. Dye Study Planning 150 K 6.Section Bayer Studies 36 K 180 K 180 K (4 Acres) (66 Acres) (66 Acres) 7. Bayer Efficacy Testing 62 K 64 K 8. Stock Recruitment Workshop April & Nov./96 III. Environmental Assessment 1. Envir. Assess. Process ? K ? K ? K 2. Non-Target Impacts ------- Develop plan $0 K ? K ? K ? K

  1. Control Options

    • Reduce Reproduction

      • Trapping of spawning phase sea lampreys and release of sterilized males: These are ongoing Agent activities and are reported on in the sterile male release technique and the spawning-phase assessment sections of this report on pages 52 to 57 and 36 to 43. These activities will be intensified when the new traps described below become operational.

      • Enhanced adult trap at the GLP facility: The design for the new adult was completed in 1995. Initially the trap will not incorporate a fish pump to remove adults from the trap, but will have a swim-out pipe with water flow to allow trapped adults to swim to a holding area. This concept will be tested in 1996 and if successful, the fish pump will be unnecessary. Construction and installation of the trap are planned to be completed by May, 1996, to be operational for the1996 spawning run. Construction and engineering costs are still expected to be within the budgeted $100K.

      • Enhanced adult trap at U.S. C.O.E. facility: Progress continued in 1995 on plans to construct an enhanced trap(s) at the U.S.C.O.E. facility. Frequent discussions and negotiations between the COE, the U.S. Agent and the GLFC led to an accepted design. Sea lampreys are attracted to the site because of the water volume and velocity and the barrier of the COE facility concentrates the lampreys. The design of the enhanced trap will maximize the attractiveness of the existing water volume and velocity. Construction of the traps at the COE facility is scheduled for completion by May, 1997, which would make them operational for the 1997 spawning season. The GLFC cost share will be $61K of the total estimated $244K.

    • Reduction in Larval Population

      • Section Bayer treatments: Treatments with the new granular Bayer formulation would not begin until 1998, following futher field testing of the formulation's efficacy in 1996 and 1997. The timeline previously suggested treating 160 acres in 1996 and 450 acres in 1997, but because of questions raised during the 1995 field and lab testing, no operational treatments are recommended until 1998. Up to 450 acres (cost $1,012K) could be treated starting in 1998, depending on test results, with annual applications to follow if funding allows.

      • Section and whole river TFM treatments: TFM treatment options would not be feasible until 1999 at the earliest. The flow (dye) study and the larval assessment work must be completed before an analysis of effectiveness and cost of using TFM can be made. As well, other information and preparations would need to be completed and funding secured. Pre.iminary indications are that a TFM treatment of the whole river will not be cost effective, but a treatment of the north channel portion might be (see section on flow model below).

  2. Information Needs

    • Larval and habitat mapping: At the conclusion of the 1994 field season, the St. Marys river had been sampled at a point density of every 70 metres from the navigational locks downstream through the North Channel to the head of Lake George and downstream in Lake Nicolet to Six Mile Point. Because densities were expected to fall off substantially in the lower portion of Lake Nicolet, sampling intensity in 1995 was reduced to transects spaced every 140 metres. A total of 10,003 stations have been examined over an area of 56.03 km2 since 1993 (Figure 9).

      Figure 9. Area sampled for larval sea lamprey distribution in the St. Marys River to end of 1995 (shaded area).

      Previous Section of the Sea Lamprey Annual Report

      Next Section of the Sea Lamprey Annual Report
      Return to the Sea Lamprey Control Program Annual Report, Table of Contents
      Return to the Great Lakes Fishery Commission's Home Page