Trinity River Trapping Summary 8/13-8/19/2014


Junction City Weir Trinity Trapping Summary Update 8/13-8/19/2014

Chinook Coho Steelhead
Julian Trap Grilse 2 Adults Combined Grilse 2 Adults Combined 1/2 lbers 2 Adults Combined Brown trout
week Inclusive dates days Total Ads 3 Total Ads 3 Total Ads 3 Total RMs 3 Total RMs 3 Total RMs 3 Total Ads 3 Total Ads 3 Total Ads 3 <42 cm >41 cm Total
23 4-Jun —- 10-Jun 1 0 0 2 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8 9
24 11-Jun —- 17-Jun 5 2 0 121 24 123 24 0 0 0 0 0 0 0 0 1 0 1 0 1 35 36
25 18-Jun —- 24-Jun 5 1 0 205 29 206 29 0 0 0 0 0 0 0 0 6 0 6 0 1 18 19
26 25-Jun —- 1-Jul 5 4 0 230 36 234 36 0 0 0 0 0 0 1 0 0 0 1 0 5 22 27
27 2-Jul —- 8-Jul 4 9 2 132 21 141 23 0 0 0 0 0 0 0 0 3 0 3 0 2 18 20
28 9-Jul —- 15-Jul 5 6 0 65 10 71 10 0 0 0 0 0 0 0 0 4 0 4 0 10 28 38
29 16-Jul —- 22-Jul 5 6 0 34 5 40 5 0 0 0 0 0 0 0 0 2 0 2 0 4 13 17
30 23-Jul —- 29-Jul 5 2 1 9 2 11 3 0 0 0 0 0 0 0 0 3 1 3 1 4 5 9
31 30-Jul —- 5-Aug 5 21 3 39 6 60 9 0 0 0 0 0 0 0 0 6 0 6 0 2 0 2
32 6-Aug —- 12-Aug 5 9 2 19 0 28 2 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1
33 13-Aug —- 19-Aug 5 19 3 58 8 77 11 0 0 0 0 0 0 0 0 1 0 1 0 0 1 1
34 20-Aug —- 26-Aug
35 27-Aug —- 2-Sep
36 3-Sep —- 9-Sep
37 10-Sep —- 16-Sep
38 17-Sep —- 23-Sep
39 24-Sep —- 30-Sep
40 1-Oct —- 7-Oct
2014 Season Totals: 50 79 11 914 141 993 152 0 0 0 0 0 0 1 0 27 1 28 1 31 148 179
2013 Season Totals4: 74 20 3 813 140 833 149 0 0 1 0 1 0 0 0 84 31 84 31 44 188 232

 

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

 

General Information
1. All data are preliminary, are subject to revision, and should be cited as such.
2. Trapping numbers and totals at Junction City and Willow Creek weirs are not total population estimates.
3. Fish trapped at the weirs are a sub-sample of the population. These fish are tagged for the purpose of estimating the population size using whats known as
a “mark and recapture” estimator. Population estimates are formulated at the end of each run year.
4. Trinity River Hatchery totals are actual counts reflective of all fish which have entered and been processed at the facility.
5. Tags placed on fish trapped at the weirs are used for population estimates and angler harvest estimates.
6. Fishing is not allowed within 750 feet of the weirs which are marked with signs at the upstream and downstream ends of the closure.
7. Fin clip totals (Ad and RM) at the weirs and hatchery are used to estimate the hatchery contributions to each run. Currently, 100% of the steelhead (AD clip)
and coho (RM clip) are marked at the hatchery prior to release as juveniles. Chinook salmon (AD clip) are marked at a rate of approximately 25% prior to release.
8. Weir installation and removal dates are variable from year to year and are affected by river flow and funding levels.
9. Previous year totals are not always for the same time periods and should not be used for absolute comparisons, note installation date notes for each site.
10. Adult and grilse(jack) counts are based on provisional cut-off sizes. The actual composition of the run is determined post season.
Junction City weir
1. This 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 Junction City weir. We do not attempt make population estimates for these species at
Junction City 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 our 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.
Willow Creek weir
1. This weir is designed to capture and estimate the population of fall Chinook salmon, coho salmon and adult fall-run steelhead and is typically operated from
late August through November (flows permitting). The weir is “fished” Sunday evening through Friday afternoon. The weir is not fished on weekends and
afternoons to allow for fish passgae.
2. The tail end of the spring chinook run is captured at Willow Creek, however we do not attempt to estimate this run of Chinook salmon above Willow Creek weir.
3. All fish deemed in good condition at Willow Creek weir are tagged with spaghetti tags inscribed with our address.
Trinity River Hatchery
1. Hatchery summaries are not always posted on a weekly basis due to the large amount of data collection and entry.
2. All hatchery totals are complete counts of what has been processed at the facility.
3. Hatchery totals do not include fish which are being held in on-site ponds for ripening and future spawning.
4. There is a break in spawning operations, usually in October, to facilitate separation of spring and fall-run Chinook salmon.
5. The hatchery serves as our main recovery point for fish tagged at the two weirs.

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