| 12/31/2013 09:35 AM |
Trawl sampling to detect PIT-tagged juvenile salmonids in the estuary began on 25 March 2013. Intermittent sampling gradually increased until 29 April to 6 June when two daily shifts were used. Following this period we resumed intermittent sampling until 25 July. During the two shift period we sampled in daylight and darkness, averaging14 sample hours/d, and detected 2.7% of yearling Chinook salmon and 3.8% of steelhead previously detected at Bonneville Dam (a rough measure of sample efficiency). In total, we detected 22,879 salmonids in 889 hours of sampling (10,400 spring/summer Chinook salmon, 1,061 fall Chinook salmon, 9,299 steelhead, 1,023 sockeye salmon, 747 coho salmon, 7 cutthroat trout, and 342 fish with no release information in PTAGIS). |
|
matthew.morris |
| 03/18/2014 02:46 PM |
Trawl sampling began on 18 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration. |
|
matthew.morris |
| 08/01/2014 07:47 AM |
During 2014, we sampled for 925 h and detected 15,904 tagged fish. Sampling began on 18 March with a daily shift, and effort was gradually increased to two daily shifts during the juvenile migration peak (28 April 12 June). After 12 June, we scaled back to a single daily shift until 30 July. In total, we detected 6,744 spring/summer Chinook, 684 fall Chinook, 545 coho, 886 sockeye salmon, and 6,765 steelhead. During the peak migration period, we detected 1.8% of the yearling Chinook salmon and 2.4% of steelhead previously detected at Bonneville Dam, along with similar proportions of fish released from transport barges just below the dam. |
|
matthew.morris |
| 03/19/2015 01:58 PM |
Trawl sampling began on 19 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration. |
|
matthew.morris |
| 07/05/2015 02:42 PM |
During 2015, we sampled for 813 h and detected 19,889 tagged fish. Sampling
began on 19 March with a daily shift, and effort was gradually increased to
two daily shifts during the juvenile migration peak (4 May 11 June). After 11
June, we scaled back to a single daily shift until 2 July. In total, we
detected 8,806 spring/summer Chinook, 730 fall Chinook, 603 coho, 744
sockeye salmon, and 8,284 steelhead. During the peak migration period, we
detected 3.3% of the yearling Chinook salmon and 4.6% of steelhead
previously detected at Bonneville Dam, along with similar proportions of
fish released from transport barges just below the dam |
|
matthew.morris |
| 03/24/2016 10:44 AM |
Trawl sampling began on 24 March and will continue intermittently through late April. We will then increase our effort to two daily shifts and sample seven days per week during the height of the juvenile outmigration. |
|
matthew.morris |
| 01/05/2017 10:28 AM |
During 2016, we sampled for 829 h and detected 12,165 tagged fish. Sampling began on 24 March with a daily shift, and effort was gradually increased to two daily shifts during the juvenile migration peak (1 May 9 June). After 9 June, we scaled back to a single daily shift until 5 July. In total, we detected 5,217 spring/summer Chinook, 323 fall Chinook, 697 coho, 234 sockeye salmon, and 5,313 steelhead. During the peak migration period, we detected 2.0% of the yearling Chinook salmon and 3.4% of steelhead previously detected at Bonneville Dam, along with 1.6% of the yearling Chinook and 2.8% of the steelhead released from transport barges just below the dam. |
|
borskyaj5 |
| 01/17/2018 12:00 AM |
During 2017, we sampled for 711 h with the matrix trawl and detected 8,419 tagged fish. Intermittent sampling began on 17 March, and effort was gradually increased to two daily shifts during the juvenile migration peak (30 April-15 June). We ended sampling on 16 June. In total, we detected 3,169 spring/summer Chinook, 535 fall Chinook, 207 coho, 175 sockeye salmon, 4,109 steelhead, 2 cutthroat trout, 2 Pacific Lamprey, and 220 fish with no species data in the PTAGIS database. During the peak migration period, we detected 1.0% of the yearling Chinook salmon and 1.3% of steelhead previously detected at Bonneville Dam, along with 0.9% of the yearling Chinook and 3.0% of the steelhead released from transport barges just below the dam. |
|
EHolcombe |