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
---------- ----- --------
07/07/2011 11:17 Bob_Magi

    Sampling for outmigrating PIT-tagged juvenile salmonids with a surface
    pair-trawl in the Columbia River Estuary concluded 1 July 2011.
    Intensive sampling (two daily shifts) was conducted from 2 May to 10
    June.  We sampled for a total of 669 hours and detected 14,116
    PIT-tagged fish. The lower total number of detections this year compared
    to 2010 (31,325) is a direct result of the high river flows observed
    through most of the sampling season.   As observed in other high flow
    years, juvenile out migrants were greater dispersed and traveled faster
    through the sampling reach reducing our opportunity to detect them.
    Additionally, sampling time was reduced as crews spent more time
    traveling to higher sections of the sampling reach to set the trawl than
    in lower flow years.   Intotal, we detected 5,574 yearling Chinook
    salmon, 1,651 subyearling Chinook salmon, 325 coho, 5,186 steelhead, 433
    sockeye, 1 cutthroat and 946 fish without release information at this
    date (unknown).

    Sampling with the Mobile separation by code (MSbyC) vessel with the
    pair-trawl was delayed until late in the season due to delays in
    modifications to the vessel.  Sampling occurred on one occasion (June
    24) when densities of PIT-tagged fish in the estuary were low.   We
    sampled for 2.5hrs and recovered 4 PIT-tagged Chinook salmon.
    Additionally, we diverted all flow to the sample tank for a total of 5
    minutes and recovered 96 untagged Chinook salmon, 2 untagged steelhead
    and 23 stickleback.
04/04/2011 12:44 Bob_Magi

         Sampling in the Columbia River Estuary (approximately rkm 61-83)
    for PIT-tagged juvenile salmonids with a surface trawl was initiated on
    22 March 2011.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 7 days per week
    (excluding one night shift per week), as densities of PIT-tagged fish in
    the estuary increase and warrant the effort (typically in early
    May).This effort will remain consistent through the high fish density
    period of the juvenile 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 modified 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.
01/01/2011 00:00 PTOC_Bot
    Annual log file initiation for TWX

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