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Alaska Department of Fish and Game


Kenai Chinook Estimates, Indices and Inseason Run Summaries

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Location: Kenai River (king salmon)
Species: Chinook - Late Run
Method: Sonar

The selected years are color-coded in the graphs below:

  • 2015
  • 2014
  • 2013
  • 2012
  • 2011
Daily Counts
Cumulative

Description: The DIDSON sonar estimates will be updated twice weekly. The daily estimates represent king salmon of all age and size classes and is expanded by 1.55 to account for early-run king salmon passing outside of the ensonified zone, and 1.28 to account for late-run salmon. This DIDSON sonar estimate is used to measure total run abundance relative to the optimum escapement goal of 5,300-9,000 early-run king salmon and the sustainable escapement goal of 15,000–30,000 late-run king salmon. To view daily estimates about king salmon passage go to the Abundance Indices tab, which is updated as data becomes available. The inseason run summary tab will provide information about king salmon passage at the mile 14 DIDSON sonar site external link, netting project, creel survey, water conditions and management actions twice each week. Information about the status of the run and inseason management actions are also available by telephone at (907) 262-9097.

Contact: Area Management Biologist,
(907) 262-9368

Weekly Sportfish Fishing Report for this area

46 records returned for the years selected. Dashes indicate days with no count.
[Export results in Excel format]

Date
2015
Count
2015
Cumulative
2015
Cumulative
2014
Cumulative
2013
Cumulative
2012
Notes for
2015
Aug-15 - 0 16,671 17,028 28,021  
Aug-14 - 0 16,671 16,895 27,848  
Aug-13 - 0 16,671 16,590 27,435  
Aug-12 - 0 16,671 16,316 26,963  
Aug-11 - 0 16,671 16,120 26,343  
Aug-10 - 0 16,598 15,906 25,556  
Aug-09 - 0 16,526 15,682 24,448  
Aug-08 - 0 16,397 15,493 23,571  
Aug-07 - 0 16,250 15,324 22,798  
Aug-06 - 0 16,041 15,131 21,561  
Aug-05 - 0 15,876 14,880 20,826  
Aug-04 - 0 15,489 14,605 20,456  
Aug-03 - 0 15,183 14,230 19,791  
Aug-02 - 0 14,857 13,813 19,045  
Aug-01 - 0 14,287 13,529 18,283  
Jul-31 - 0 13,589 13,023 17,422  
Jul-30 - 0 12,706 12,423 16,320  
Jul-29 - 0 12,051 11,746 15,594  
Jul-28 - 0 11,224 10,943 14,752  
Jul-27 - 0 10,657 10,503 13,629  
Jul-26 - 0 10,405 10,032 12,528  
Jul-25 - 0 9,879 9,365 11,596  
Jul-24 - 0 8,965 8,948 10,970  
Jul-23 - 0 8,023 8,678 10,363  
Jul-22 - 0 7,306 8,291 10,081  
Jul-21 - 0 6,843 7,954 9,445  
Jul-20 - 0 6,472 7,743 8,927  
Jul-19 - 0 5,458 7,497 8,096  
Jul-18 - 0 4,571 7,090 7,650  
Jul-17 - 0 3,960 6,401 6,929  
Jul-16 - 0 3,458 5,733 5,645  
Jul-15 - 0 3,208 4,985 5,133  
Jul-14 - 0 3,006 4,441 4,809  
Jul-13 - 0 2,836 3,513 3,998  
Jul-12 - 0 2,574 2,974 3,144  
Jul-11 - 0 2,356 2,709 2,639  
Jul-10 - 0 2,122 2,253 2,095  
Jul-09 - 0 1,926 1,722 1,450  
Jul-08 - 0 1,708 1,365 1,130  
Jul-07 - 0 1,524 1,196 962  
Jul-06 - 0 1,158 1,032 807  
Jul-05 - 0 838 900 680  
Jul-04 - 0 569 695 605  
Jul-03 - 0 479 523 508  
Jul-02 - 0 299 360 351  
Jul-01 - 0 148 174 210  

Sonar Tools

Late Run DIDSON Threshold (>30 in.) Sonar Estimate

The DIDSON threshold estimate is an estimate for fish targets that are measured to be 750 millimeters (30 inches) or greater in total length. These estimates are a daily index of the relative abundance of king salmon passage between the transducers at the mile 8.6 sonar and are not expanded to estimate passage of fish outside the ensonified zone.

Show DIDSON Threshold Data Table ↓

Date 2014 2013 2012 2011
Jul-01 78 164 175 272
Jul-02 153 273 269 616
Jul-03 237 376 372 852
Jul-04 283 479 425 1,059
Jul-05 404 588 463 1,313
Jul-06 561 654 541 1,572
Jul-07 730 738 637 2,129
Jul-08 838 841 727 2,497
Jul-09 928 1,022 943 2,793
Jul-10 1,018 1,317 1,425 3,149
Jul-11 1,120 1,582 1,769 3,330
Jul-12 1,210 1,727 2,064 3,711
Jul-13 1,361 2,041 2,558 4,369
Jul-14 1,457 2,530 3,021 5,277
Jul-15 1,553 2,832 3,250 5,776
Jul-16 1,692 3,279 3,564 6,325
Jul-17 1,987 3,641 4,335 7,551
Jul-18 2,347 4,021 4,757 8,375
Jul-19 2,866 4,250 5,046 9,328
Jul-20 3,463 4,407 5,697 10,299
Jul-21 3,686 4,546 6,047 11,108
Jul-22 3,963 4,745 6,492 11,694
Jul-23 4,428 4,997 6,685 12,352
Jul-24 4,916 5,159 7,076 13,076
Jul-25 5,453 5,400 7,525 13,801
Jul-26 5,773 5,768 8,030 14,224
Jul-27 5,954 6,046 8,740 14,508
Jul-28 6,310 6,330 9,457 14,665
Jul-29 6,823 6,807 9,982 14,885
Jul-30 7,215 7,266 10,412 15,129
Jul-31 7,782 7,652 11,069 15,533
Aug-01 8,286 7,978 11,533 15,749
Aug-02 8,709 8,173 12,027 15,843
Aug-03 8,926 8,481 12,528 15,952
Aug-04 9,143 8,735 13,021 16,030
Aug-05 9,396 8,916 13,274 16,345
Aug-06 9,517 9,091 13,856 16,719
Aug-07 9,668 9,224 14,775 16,894
Aug-08 9,777 9,350 15,378 17,058
Aug-09 9,879 9,477 16,011 17,348
Aug-10 9,927 9,634 16,909 17,460
Aug-11 9,969 9,809 17,403 -
Aug-12 - 9,989 17,789 -
Aug-13 - 10,169 18,121 -
Aug-14 - 10,392 18,408 -
Aug-15 - 10,504 18,521 -

Late Run Sonar Net Apportioned Cumulative Passage Estimates

The Net Apportioned sonar estimate of Chinook salmon passage is based on the combination of the number of fish detected by sonar and number of Chinook salmon captured by the netting project conducted at the sonar station located at river mile 8.6.


Non-Sonar Tools

Late Run Netting Project CPUE Index

The Net Catch Per Unit Effort (CPUE) is an index of the numbers of Chinook salmon moving into the Kenai River and is based on the rate at which Chinook salmon are captured by the netting project conducted at the sonar station located at river mile 8.6.


Late Run Sport CPUE Index

The Sport Catch Per Unit Effort (CPUE) is an index of the numbers of Chinook salmon in the lower Kenai River and is based on the success rate of anglers fishing downstream of the Sterling Highway Bridge Crossing in Soldotna.

Late Run Eastside Setnet CPUE Index

The Eastside Setnet Catch per Unit Effort (CPUE) is an index of the total number of late-run Kenai River Chinook salmon.

Weekly Sportfish Fishing Report for this area


Final Late Run Kenai River Chinook Inseason Summary

King Salmon Run Update:

The preliminary DIDSON estimate of king salmon passage at the river mile 8.6 sonar site was 16,671 king salmon. Approximately 18% of the total late-run king salmon passage occurred in August, which is typical. Compared to the mean of the previous four years of DIDSON counts, this year’s inriver run was approximately two days late at the midpoint. Daily king salmon passage over the last four days was less than one percent of the cumulative season passage. For the 2014 late-run, the DIDSON estimate as well as all indices used to assess run abundance indicated an inriver run that appears to be the worst on record.

Fishery Harvest:

The preliminary creel survey estimate of king salmon sport fish harvest (including catch-and-release mortality) was approximately 610 fish. The inriver sport fishery for king salmon was restricted for the entire 2014 season, and was closed from July 26 to the end of the season on July 31. Retention of king salmon in the personal use dip net fishery was prohibited in 2014. The preliminary commercial eastside set net harvest was 2,055 king salmon, of which 549 were harvested by set nets in the Kasilof terminal area. Post-season analysis of tissue samples collected in these fisheries will be used to estimate the component of Kenai River king salmon. The commercial eastside set net fishery was also restricted for the entire 2014 season, and was closed from July 26 through August 2.

Escapement:

The sustainable escapement goal (SEG) for Kenai River late-run king salmon is 15,000 to 30,000 king salmon. The preliminary total estimated inriver mortality (harvest and catch and release mortality) above the sonar is 610 fish. Therefore, the preliminary escapement estimate is 16,061 king salmon. The sustainable escapement goal was estimated to have been achieved on Tuesday, August 5th. It should be noted that escapement levels would have been much lower had the inriver sport, personal use and the commercial eastside set net fisheries not been restricted and closed.

Additional Information:

The department continued the king salmon netting project at river mile 8.6 and the sonar research project at river mile 13.7 through August 15. The daily catches of king salmon were very low and pink salmon as well as sockeye salmon catches declined sharply from August 12 thru August 15 in the netting project conducted at the 8.6 sonar station. Coho salmon catches thru August 10 were the second highest recorded in the last 13 years of the king salmon netting project. The king salmon radio telemetry project will continue well into the fall. These research projects are not yet completed for the year and are designed to provide information to investigate operating DIDSON sonar for future inseason management of king salmon at river mile 13.7. Genetic samples collected in 2014 will be processed later this winter and will be used to estimate the abundance of the 2014 total run of Kenai River late-run king salmon.

Summary of cumulative raw information collected thru Aug 26 (by year) that is used to assess Kenai River king salmon run strength.
Year Number Chinook Captured in Test Net at Sonar Station Number Sockeye Captured in Test Net at Sonar Station Chinook Sport Harvest Below Soldotna Estimated by Creel Survey Cumulative DIDSON Sonar Estimate Cumulative Net Apportioned Sonar Estimate Commercial Set Net Harvest
2002 1,171 1,915 11,482 N/A 61,490 9,478
2003 1,446 1,464 13,837 N/A 92,115 14,810
2004 1,077 749 14,494 N/A 110,367 21,616
2005 1,027 730 15,312 N/A 125,872 20,968
2006 1,330 566 13,190 N/A 77,176 8,691
2007 780 2,059 9,258 N/A 43,317 12,128
2008 895 1,435 9,272 N/A 52,958 6,409
2009 559 1,798 7,378 N/A 26,066 5,588
2010 311 3,454 5,375 24,292 18,116 7,059
2011 472 3,548 6,458 26,926 27,584 7,697
2012 345 3,685 102 28,050 20,435 704
2013 200 2,048 1,577 17,015 17,756 2,630
2014 288 4,430 539 16,671 N/D 1,506

NOTE: N/A means that there is no fishery for that date, and an asterisk (*) means that there is no data for that date.