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Fish Counts
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Hiram M. Chittenden Locks Salmon Counts

Past Years Archive 

Hiram M. Chittenden Locks Sockeye Salmon Counts
June-July 2013

Total to Date: 178,422

  Daily Counts Total Count
6/12 2,778 2,778
6/13 2,424 5,202
6/14 1,285 6,487
6/15 2,430 8,917
6/16 3,081 11,997
6/17 3,603 15,600
6/18 3,851 19,541
6/19 4,638 24,089
6/20 2,961 27,050
6/21 3,296 30,346
6/22 10,782 41,128
6/23 12,936 54,064
6/24 4,545 58,608
6/25 6,021 64,629
6/26 5,577 70,206
6/27 4,641 74,847
6/28 5,314 80,162
6/29 9,084 89,246
6/30 9,182 98,428
7/1 5,135 103,563
7/2 5,194 108,757
7/3 5,185 113,942
7/4 3,309 117,251
7/5 3,257 120,508
7/6 2,988 123,496
7/7 6,543 130,039
7/8 3,791 133,830
7/9 4,532 138,362
7/10 4,748 143,110
7/11 4,130 147,240
7/12 5,607 152,847
7/13 4,191 157,038
7/14 3,159 160,197
7/15 2,112 162,309
7/16 1,287 163,596
7/17 1,706 165,302
7/18 697 165,999
7/19 1,461 167,459
7/20 1,311 168,770
7/21 1,088 169,858
7/22 826 170,684
7/23 960 171,644
7/24 1,269 172,913
7/25 798 173,712
7/26 988 174,700
7/27 750 175,450
7/28 621 176,071
7/29 539 176,610
7/30 495 177,105
7/31 244 177,349
8/01 305 177,654
8/02 146 177,800
8/03 173 177,973
80/4 179 178,152
8/05 111 178,263
8/06 158 178,422

Past Years Archive

Lake Washington sockeye salmon have been counted each year since 1972 as they enter freshwater at the Hiram M. Chittenden Locks. The Washington Department of Fish and Wildlife (WDFW) counted the sockeye from 1972 through 1992, and currently Muckleshoot Indian Tribe and WDFW staffs conduct the counts cooperatively. Although small numbers of sockeye enter the system in May and early June, the period from the second week of June through the end of July is the standard counting interval used to determine if there are sufficient sockeye to open fishing seasons. Sockeye counts begin on June 12th each year to provide consistent data from year to year. The sockeye are sample counted daily during set time periods as they pass through both the locks and the fishway, and the counts are converted into a daily total number of fish passing upstream. In early July, State and Tribal managers begin to make weekly projections of the expected total run size based on the current total counts. When the co-managers believe that the total run size includes sufficient surplus fish above the escapement goal of 350,000 sockeye, sport and Tribal fishing seasons will be opened.

2013 Pre-season Sockeye Forecast

The pre-season forecast for the 2013 sockeye return is about 96,866. The estimate is based primarily upon fry production from the spawners in 2008, 2009, and 2010. Since lake and marine survival rates are highly variable from year to year, the actual return to Lake Washington could be higher or lower than 96,866.

Collecting biological samples from adult sockeye

In 2013 a comprehensive biological sampling program will continue gathering critical information for the management of Lake Washington sockeye salmon, including changes in populations, survival rates, genetic identification, changes in size, etc.

The goal is to collect approximately 200 adult sockeye each week as they move from seawater into the Lake Washington Basin. Biologists from the Muckleshoot Indian Tribe will lead the sampling effort, with the collaboration of WDFW staff who will assist in the collection and processing of samples from the adult sockeye. Seattle Public Utilities provides funding for processing and analysis of these biological samples.

The types of information that will be collected are:

  • Scales
  • Lengths
  • Genetic Samples (DNA)
  • Mark Samples (Otoliths and tags)
  • Sex

The following are examples of three important biological data sets.

Age Composition - Sockeye salmon age compositions are a necessary step in measuring survival rates. Insufficient age data have been collected in recent years because of budget constraints and due to the difficulty of collecting a representative sample. Scales from the adult fish will be used to determine ages.

Wild/hatchery proportions - Artificially produced sockeye salmon will be an important component of the return in 2011 and coming years. The hatchery fish are 100% otolith (small bones inside the head) marked for differentiation from wild-origin sockeye. The accurate estimation of the numbers of returning hatchery fish is important to evaluate hatchery performance, and can be used to inform in-season fishery management decisions.

Genetic Diversity - Because genetic (DNA) analysis has only recently become available as an assessment tool, consistent genetic sampling programs have not been a part of the management process. Tissue samples collected from Lake Washington sockeye stocks will be used to make future comparisons between populations based on DNA profiles. This may allow the in-season monitoring of the returns of various wild and hatchery stocks, the crafting of protective measures in fisheries, and may allow the measurement of the influence of hatchery fish on wild sockeye.

Chinook

Chinook Salmon at Ballard Locks

Click chart for enlargement

Coho

Chinook Salmon at Ballard Locks

Click chart for enlargement