EVENT LOG FOR SITE TWX Most recent activity to be listed first. First line of each entry lists date, time and who is reporting. Subsequent lines of each entry aligned under Time column. Do not use tabs, only spaces. Date Time Who What -------- ----- -------- ----------------------------------------------- 07/08/2004 19:18 Ledgerwo Site event log estuary PIT-trawling 2004. A total of 16,582 PIT-tagged juvenile salmonids were detected in the estuary using the large pair-trawl detection system in 2004. Sampling began on 14 April and continued through 3 July and a total of about 800 hours of detector on-time were recorded during this period. All detection records have specific GPS positions available. Two daily sampling crews were used between 21 April and 23 June when detector on-times averaged about 13 hours per day (minimum daily effort during this period was 5 hours per day). All data files have been submitted to PTAGIS interrogation site code TWX. Of the total detections, 947 had been previously detected at Bonneville Dam. Those fish will form the basis of calculation survival for inriver migrants to Bonneville Dam using the Single Release method. Perhaps as many as 3,000 detections (pending final analysis) were transported by barge and released downstream from Bonneville Dam, those detections will be used to compare timing and relative survival of barged and inriver migrant fish to better understand the variations in smolt to adult ratios for those fish groups passing into the ocean at similar times. The small trawl system sampled in the lower estuary from 5 May to 10 June (126 hours of ontime). A dissapointing 127 fish were detected between the mouth of the river and the Astoria-Meagler Bridge. It is possible that fish may have escaped the net rather than exit through the salt-water antenna where they could have been detected. A total of six fish were detected in the upper and then lower estuary (travel times between 18 and 33 hours). A proto-type trawl-like shoreline PIT sampler was deployed along the beach at Jones Beach for 8 days between 2 June and 8 July. No naturally migrating salmonids were detected in about 24 total hours of sampling. Divers and cameras were used to verify low impact and proper net configuation. To further verify performance, over 2,500 juvenile salmonids captured in beach seines at Jones Beach were individually processed for the presence of PIT tags and none had been tagged. About 50 of these fish were then PIT-tagged and released in small batches near the head-rope of the shoreline sampler. We detected about half of those released. Observations of released fish suggested that fish were reluctant to exit the trawl body by swimming through the antenna (3' diameter). 06/28/2004 13:52 Darren This is a test message sent from the ‘legacy’ web interface. It should be deposited in the top-level directory of the TWX Events forum. 04/15/2004 10:52 Ledgerwo Intermittent electronics testing and equipment preparation activities for the large surface pair-trawling effort began in early April near Jones Beach, river kilometer 75 (site code TWX). The first trawl deployment occurred on 14 April and training deployments with limited daily sampling effort will continue for about a week. At that time, a two daily sampling crew operation will begin and continue throughout the spring migrant period (mid to late June). Sampling with a single crew in late June through July for subyearling migrants is also planned but contingent on numbers of PIT-tagged migrants available at that time. We anticipate deployment of a smaller trawl system in the lower estuary in early May (site code ESX, estuary salt-experimental). Sampling with the small trawl, single crew, to continue 5 days a week through early June. We will also experiment with a shoreline PIT-tag sampler adjacent to site TWX in late May and again in early July. 01/01/2004 12:03 Dave Initialized new event log for 2004. 2003 event log has been archived. ####End of Event Log for TWX###