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
---------- ----- --------
08/28/2009 14:28 Bob_Magi
    Sampling for juvenile PIT-tagged salmonids with the matrix surface
    pair-trawl system in the Columbia River estuary in 2009 was concluded on
    12 August due to low availability of Pit-tagged fish in the estuary.  We
    deployed with the matrix antenna trawl system in the mid-river
    exclusively this year and sampled for 1097 hours with 23,247 fish
    detected.  Sampling with two daily crews was conducted from 1 May to 13
    June coinciding with the majority of the outmigration through the
    estuary.  We sampled with our shoreline system intermittently from 10
    March until 27 April for a total of 42 hours yielding no detections.
    Fall sampling will not be conducted due to low fish densities resulting
    in few detections in the estuary during this period, as observed in 2008.
03/31/2009 08:51 Bob_Magi
    Sampling for juvenile pit-tagged salmonids between river kilometer 61 to
    83 using a surface pair-trawl began on 6 March 2009.  The 8.5 foot by 10
    foot Matrix antenna and trawl consisting of 6-coils (3 front and 3 rear)
    was and will continue to be deployed 3 days per week until densities of
    pit-tagged fish increase in the estuary.  In 2008 the Matrix system
    proved twice as effective at detecting pit-tagged fish as the 3
    foot-diameter antenna used early in the season resulting in the
    exclusive use of the newer and larger antenna system.  Sampling effort
    will increase in April to a single shift 5 days per week and eventually
    7 days weekly with both a day and a night shift as detections increase.
    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.



    The shoreline Matrix system developed in 2007 was and will continue to
    be used 2 days per week from 12 March until mid April 2009 to sample
    shoreline oriented pit-tagged fish.  This 8.5 foot by 10 foot antenna
    consists of 2-coils in series and is attached to a surface oriented net
    that, when deployed, is fixed to an anchor point on the beach and the
    opposing wing is fixed to a vessel anchored offshore.  2009 Shoreline
    sampling efforts are focused on detecting pit-tagged fish that may have
    overwintered in the estuary and other shoreline oriented early migrants.
01/01/2009 00:00 PTOC_Bot
    Annual log file initiation for TWX

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