Trinity River Hatchery Weir Trapping Summary 9/26/2015


Trinity River Hatchery Weir Trapping Summary Update 9/10/2015-9/16/2015


Total combined Chinook increased from 169 to 246.

Total combined Steelhead increase from 3 to 30.

Chinook Coho Steelhead
Julian Grilse 2 Adults Combined Grilse 2/ Adults Combined Adults
week Inclusive dates Total Ads 3 Total Ads 3 Total Ads 3 Total RMs 3 Total RMs 3 Total RMs 3 Total Ads 3
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 0 0 0 0
39 24-Sep 30-Sep 0 0 0 0
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: 125 20 290 58 415 78

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.

Leave a comment

Your email address will not be published. Required fields are marked *