Trinity River Hatchery Weir Trapping Summary 10/2/2015


Trinity River Hatchery Weir Trapping Summary Update 9/24/2015-9/30/2015


Total combined Chinook decreased from 845 to 427.

Total combined Steelhead decreased from 34 to 22.

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 0 0 0 0
41 8-Oct 14-Oct 0 0 0 0
42 15-Oct 21-Oct 0 0 0 0
2015 Spring Chinook subtotal: 256 47 1,431 314 1,687 361

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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