EVENT LOG FOR SITE TWX

        The first line of each entry contains a date/time stamp & who is reporting.
        The most recent entry is listed first.

Date       Time  Who
---------- ----- --------
09/21/2010 17:08 Bob_Magi
    Sampling for outmigrating PIT-tagged juvenile salmonids with a surface
    pair-trawl in the Columbia River estuary concluded 4 August 2010.
    Intensive sampling (two daily crews) was conducted from 30 April to
    15 June.  We sampled for a total of 882 hours and detected 31,325
    PIT-tagged fish.  We detected more PIT-tag fish in 2010 than in any
    previous year, surpassing the previous record of 23,247 detections in
    2009 in 1,097 hours. The greatest increase in PIT-trawl detections were
    for yearling Chinook salmon which nearly doubled when compared to
    previous years. In total, we detected 17,153 yearling Chinook salmon,
    2,857 subyearling Chinook salmon, 646 coho, 9,123 steelhead, 640
    sockeye, 1 cutthroat and 905 fish without release information at this
    date (unknown).

    The mobile separation by code system (MSBC) was deployed during sixteen
    sample-shifts for a total of 52 hours to develop deployment procedures
    and evaluate system effectiveness. During these deployments (occurring
    in periods of low PIT-tagged fish densities), we diverted samples of
    fish for a total of 6.25 hours and collected 1,052 fish (includes 67
    PIT-tagged fish). We diverted 696 Chinook salmon, 69 coho salmon, 46
    steelhead, 177 sockeye salmon, 46 chum salmon, 8 starry flounder, 2
    peamouth, 2 juv. lamprey, 2 juv. shad and numerous sticklebacks.
    Collected fish were measured and evaluated for descaling or injury. Of
    the 67 detected and diverted PIT-tagged fish collected, 63 were Chinook
    salmon (both traveling in-river and transported) and 4 were steelhead.
04/16/2010 12:23 Dave
    Updated the TWX configuration (#170) to incorporate two new antennas (D1
    and D2) in the new "Mobile SbyC System" antenna group.
04/15/2010 09:19 Bob_Magie
    Sampling in the Columbia River Estuary (approximately rkm 61-83) for
    PIT-tagged juvenile salmonids with a surface trawl was initiated on 23
    March 2010.  Using the matrix PIT tag antenna developed in 2008 (8.5ft
    wide x 10ft tall fish passage tunnel) fixed to the cod end of the
    trawl enabling fish to pass through the system unhandled, we initiated
    sampling  3 days weekly.  Sampling will increase to daily sampling 5
    days per week and finally to two daily sampling shifts, 6 days weekly,
    as densities of PIT-tagged fish in the estuary increase and warrant
    the effort (typically in early May).  This 6 day rotation will have
    day and night shifts offset so no calendar day is missed by both
    shifts.  This effort will remain consistent through the high fish
    density period of the outmigration season.  As detection rates
    decrease (late June or early July) sampling will be reduced to 5 days
    weekly using one daily shift until sampling is halted.
    
    Testing of a mobile separation by code device used with the matrix
    trawl will be conducted periodically throughout the outmigration
    season (1 to 2 days weekly) to evaluate effectiveness and impacts to
    fish.
01/01/2010 00:00 PTOC_Bot
    Annual log file initiation for TWX

         #### End of Event Log for TWX ###