Trinity River Hatchery Weir Trapping Summary 12/11/2015


Trinity River Hatchery Weir Trapping Summary Update 11/19/2015-11/25/2015


Total combined Chinook decreased from 852 to 636.

Total combined Steelhead decreased from 76 to 74.

Chinook Coho Steelhead
Julian Grilse Adults Combined Grilse Adults Combined Adults
week Inclusive dates Total Ads Total Ads Total Ads Total RMs Total RMs Total RMs Total Ads
35 2-Sep 0 0 0 0
36 3-Sep 9-Sep 23 3 146 29 169 32 0 0 0 0 0 0 3 0
37 10-Sep 16-Sep 102 17 144 29 246 46 0 0 0 0 0 0 30 27
38 17-Sep 23-Sep 62 12 783 183 845 195 0 0 0 0 0 0 34 29
39 24-Sep 30-Sep 69 15 358 73 427 88 0 0 1 1 1 1 22 20
40 1-Oct 7-Oct 32 8 162 24 194 32 7 7 3 3 10 10 8 8
41 8-Oct 14-Oct 0 0 0 0
42 15-Oct 21-Oct 0 0 0 0
2015 Spring Chinook subtotal: 288 55 1,593 338 1,881 393
43 22-Oct 28-Oct 87 18 268 64 355 82 78 77 274 263 352 340 57 57
44 29-Oct 4-Nov 97 12 820 185 917 197 91 87 95 50 186 137 93 92
45 5-Nov 11-Nov 42 12 311 83 353 95 71 70 304 252 375 322 53 52
46 12-Nov 18-Nov 40 8 812 170 852 178 58 53 659 593 717 646 76 76
47 19-Nov 25-Nov 25 2 611 132 636 134 45 44 838 823 883 867 74 74
Notes:
1/ Summary based on real time unedited data. Not to be used for analysis.
2/ Provisionally, Chinook and coho grilse are < 56 cm, FL. Steelhead 3/ Ads denote adipose fin-clipped fish; RMs denote right maxillary clipped fish. Both clip counts are a subset of the total shown.
4/ Totals are for entire season.

1. The Trinity River Hatchery weir is designed to capture and estimate the population of spring Chinook salmon and is typically operated from June or early July (depending on river flow) through September. The weir is “fished” Sunday evening through Friday afternoon. The weir is not fished on weekends and afternoons to allow fish passage.
2. Fall Chinook, steelhead, coho and brown trout are also captured at the Trinity River Hatchery weir. We do not attempt make population estimates for these species at the Trinity River Hatchery weir.
3. Chinook salmon are tagged with a “spaghetti tag” which is pvc tubing placed behind the dorsal fin. Each tag has a number and is inscribed with CDFW address.
4. Brown trout and steelhead are tagged with a “floy” tag which is inserted below the dorsal fin. Floy tags are short pieces of tubing inserted into the side of the fish and are also inscribed with our address.

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