FPC GBT Metadata


  Index:

  Gas Bubble Trauma Monitoring Sites:

  Gas Bubble Trauma Protocols:

  Definition of Terms and abbreviations used:

  Data Available  (by start and end dates by site):

  Data Source:

  How frequently Data is updated:

 

  Gas Bubble Trauma Monitoring Program and Manual


  Gas Bubble Trauma Monitoring Sites

Year Sites Years of GBT Monitoring
BON Bonneville Dam 1994 to 2015
JDA John Day Dam 1994 to 1999
MCN McNary Dam 1994 to 2015
IHR Ice Harbor Dam 1996 to 2000
LMN Lower Monumental Dam 1994 to 2015
LGS Little Goose Dam 1994 to 2015
LGR Lower Granite Dam 1994 to 2015
RIS Rock Island Dam 1995 to 2015

  Gas Bubble Trauma Protocols

Method of fish examination for GBT 2002 to 2015
Fish are examined using a variable magnification (6X to 40X) dissecting scope. Unpaired fins and eyes are examined for the presence of bubbles. The left side of the fish is examined for signs of GBT and then both eyes are examined for signs of GBT. The eye with the highest percent of bubbles will be selected to rank, using the same system as is describe for fins. The examination begins with the unpaired fins and eyes are examined and data recorded based on the percent area of the fin or eye covered with bubbles. A minimum magnification for these examinations is 10X. The area covered is estimated using the examiners best judgment. A rank is assigned based upon the percent area of the fin or eye covered with bubbles. A rank 0 is assigned if no bubbles occur; rank 1 will be assigned if 1 to 5 percent of the fin or eye is covered with bubbles; rank 2 is assigned for 6 to 25 percent area covered; rank 3 for 26 to 50 percent area covered; and rank 4 for greater than 50 percent area covered. The rank reported for the eyes is the highest rank for either eye. When the percent area covered is near the boundary for two ranks (e.g. at or near 25 percent) then the higher rank is assigned. In 1998 sampling occured 3 times a week except when TDGS levels were above 115% in dam forebays and 120% in dam tailraces based on COE monitors, then the sampled every other day.  In 1999 sampling was done twice a week.  Since 2000, sampling was be done twice a week at all Columbia River sites and 1 day per week at Snake River Sites. 
Method of fish examination for GBT 1998 to 2001
Fish are examined using a variable magnification (6X to 40X) dissecting scope. Unpaired fins, eyes, and lateral line are examined for the presence of bubbles. The left side of the fish is examined for signs of GBT and then both eyes are examined for signs of GBT. The eye with the highest percent of bubbles will be selected to rank, using the same system as is describe for fins. The examination begins with the lateral line. With the fish on its right side, the examiner searches the left lateral line for bubbles. The level of magnification required for this examination varies with the size of the fish, but will always be a minimum of 15X in order to allow for comparability among sites and years. The magnification must be great enough to discern the canal of the lateral line and also to determine whether objects in the lateral line are bubbles. The entire length of the lateral line, from the anterior end, at the point where the lateral line curves upward at the operculum, to the posterior end, at the base of the caudal fin, will be examined for bubbles.  If bubbles are found in the lateral line, then the percent length of the lateral line occluded by bubbles is estimated. The length of the lateral line occluded will be ranked according to the same criteria described for fins; rank 0 if no bubbles present; rank 1 if up to 5 percent of the lateral line has bubbles; rank 2 if 6 to 25 percent; rank 3 if 26 to 50 percent and rank 4 if greater than 50 percent of lateral line has bubbles. A rule of thumb that can provide adequate precision is that the length of 7 scales above the lateral line is approximately 5% of the total length. The "scale measure" will be used as needed to help estimate length occluded. The goal in using this technique (i.e. estimated percent occlusion) is to decrease the amount of time spent handling fish versus the alternate method of measuring bubbles precisely. Then the unpaired fins and eyes are examined and data recorded based on the percent area of the fin or eye covered with bubbles. A minimum magnification for these examinations is 10X. The area covered is estimated using the examiners best judgment. A rank is assigned based upon the percent area of the fin or eye covered with bubbles. A rank 0 is assigned if no bubbles occur; rank 1 will be assigned if 1 to 5 percent of the fin or eye is covered with bubbles; rank 2 is assigned for 6 to 25 percent area covered; rank 3 for 26 to 50 percent area covered; and rank 4 for greater than 50 percent area covered. The rank reported for the eyes is the highest rank for either eye. When the percent area covered is near the boundary for two ranks (e.g. at or near 25 percent) then the higher rank is assigned. In 1998 sampling occured 3 times a week except when TDGS levels were above 115% in dam forebays and 120% in dam tailraces based on COE monitors, then the sampled every other day.  In 1999 sampling was done twice a week.  Since 2000, sampling was be done twice a week at all Columbia River sites and 1 day per week at Snake River Sites. 
Method of fish examination for GBT 1997
Same as 1998, except the percent lateral line occlusion was calculated by determining the length of the lateral line occluded by bubbles, expressed in bubble units, where each bubble unit was approx 0.5 mm, and this was divided by the total length of the lateral line using the same units.  Sampling occurred every other day when TDGS levels were above 115% in dam forebays and 120% in dam tailraces based on COE monitors, except at RIS which sampled three times a week.
Method of fish examination for GBT 1996
Same as 1998, except the percent lateral line occlusion was calculated by determining the length of the lateral line occluded by bubbles, expressed in bubble units, where each bubble unit was approx 0.5 mm, and this was divided by the total length of the lateral line using the same units.  Sampling occurred three days per week when TDGS levels were above 115% in dam forebays and 120% in dam tailraces based on COE monitors.  GBT monitoring was conducted every other day when TDGS levels exceeded the 115/120% levels.
Method of fish examination for GBT 1995
Two methods were used to examine the fish.  Four power magnifiers were used to examine 200 fish (100 each of the two most prevalent species at that site) three days a week  Also 80 fish (40 each of the two most prevalent species at that site) were examined three days a week with 6 to 40 power variable magnification dissecting scopes at each dam.  Also, 100 juvenile chinook were examined three days per week using 4X magnifiers at RIS.  The percent lateral line occlusion was calculated by determining the length of the lateral line occluded by bubbles, expressed in bubble units, where each bubble unit was approx 0.5 mm, and this was divided by the total length of the lateral line using the same units.
Method of fish examination for GBT 1994
Fish were examined using the naked eye.  There was no ranking or percentages marked, only the absence or presence of GBT.  The eyes, fins and body were examined.

  Definition of Terms

Species
CH Chinook
ST Steelhead
Age
0 Sub-yearling
1 Yearling
LatLineGBT or LL Lateral Line Occlusion (bubbles): Rank 0,1,2,3,4 based on an estimate of the length of lateral line having bubbles.  Not used in 1994.
NumFinGBT Unpaired fins and eyes.  Not used in 1994.
SevereFinGBT Greater than 25%.  Not used in 1994.
Rank
1996 - present Percent length covered with bubbles
0 0 %
1 1 to 5 %
2 6 to 25 %
3 26 to 50 %
4 greater than 50 %
1995 Percent length covered with bubbles
0 0
1 1 to 25 %
2 26 to 50 %
3 greater than 50 %
1994 For 1994, the present or absence of GBT was noted, but no percentages or ranking was used.
 

  Data Available

2017 2016 2015

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/15/15 08/31/15
MCN 04/15/15 08/31/15
LMN 04/15/15 08/31/15
LGS 04/15/15 08/31/15
LGR 04/15/15 06/30/15
RIS 04/15/15 08/31/15

2014 2013 2012

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/15/14 08/31/14 04/15/13 08/31/13 04/15/12 08/31/12
MCN 04/15/14 08/31/14 04/15/13 08/31/13 04/15/12 08/31/12
LMN 04/15/14 08/31/14 04/15/13 08/31/13 04/15/12 08/31/12
LGS 04/15/14 08/31/14 04/15/13 08/31/13 04/15/12 08/31/12
LGR 04/15/14 06/30/14 04/15/13 06/30/13 04/15/12 06/30/12
RIS 04/15/14 08/31/14 04/15/13 08/31/13 04/15/12 08/31/12

2011 2010 2009

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/15/11 08/31/11 04/18/10 08/30/10 04/10/09 08/27/09
MCN 04/10/11 08/31/11 04/10/10 09/02/10 04/14/09 08/25/09
LMN 04/15/11 08/31/11 04/17/10 09/02/10 04/14/09 08/25/09
LGS 04/20/11 08/31/11 04/20/10 08/30/10 04/20/09 08/13/09
LGR 04/26/11 06/21/11 06/30/10 04/20/10 04/13/09 06/17/09
RIS 04/20/11 08/31/11 04/20/10 08/18/10 04/23/09 07/30/09

2008 2007 2006

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/18/08 08/30/08 04/07/07 08/28/07 04/10/06 08/29/06
MCN 04/14/08 08/28/08 04/12/07 08/27/07 04/11/06 08/29/03
LMN 04/14/08 08/25/08 04/09/07 09/02/07 04/10/06 08/29/06
LGS 04/15/08 08/26/08 04/11/07 08/28/07 04/10/06 08/29/06
LGR 04/08/08 06/10/08 04/10/07 06/12/07 04/10/06 08/29/06
RIS 04/24/08 08/07/08 04/16/07 08/16/07 04/11/06 08/29/06

 2005 2004 2003

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/01/05 08/31/05 04/08/04 08/28/04 04/07/03 08/28/03
MCN 04/01/05 08/31/05 04/01/04 08/28/04 04/01/03 08/28/03
LMN 04/10/05 06/30/05 04/12/04 06/30/04 04/07/03 06/30/03
LGS 04/10/05 06/30/05 04/06/04 06/30/04 04/09/03 06/30/03
LGR 04/10/05 06/30/05 04/07/04 06/30/04 04/08/03 06/30/03
RIS 04/10/05 08/31/05 04/08/04 08/28/04 04/07/03 08/28/03

2002 2001 2000

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/08/02 08/31/02 04/09/01 08/31/01 04/03/00 08/31/00
MCN 04/08/02 08/31/02 04/09/01 08/31/01 04/03/00 08/31/00
IHR
no sampling
no sampling
04/04/00 06/20/00
LMN 04/08/02 06/20/02 04/12/01 06/20/01 04/03/00 06/20/00
LGS 04/10/02 06/20/02 04/11/01 06/20/01 04/05/00 06/20/00
LGR 04/09/02 06/20/02 04/10/01 06/20/01 04/03/00 06/20/00
RIS 04/08/02 08/31/02 04/09/01 08/31/01 04/04/00 08/31/00

1999 1998 1997

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/05/99 08/30/99 04/06/98 04/29/98 04/08/97 08/30/97
JDA

no sampling

04/10/98 09/01/98 04/07/97 08/29/97
MCN 04/05/99 08/30/99 04/07/98 08/29/98 04/08/97 08/30/97
LMN 04/05/99 06/22/99 04/06/98 06/29/98 04/07/97 06/30/97
LGS 04/07/99 06/23/99 04/09/98 06/09/98 04/08/97 06/29/97
LGR 04/05/99 06/14/99 04/06/98 06/29/98 04/07/97 07/02/97
RIS 04/05/99 08/26/99 04/06/98 08/31/98 04/07/97 08/29/97

1996 1995 1994

Site

Monitoring Dates

Monitoring Dates

Monitoring Dates

Start End Start End Start End
BON 04/10/96 08/30/96 04/11/95 09/01/95 04/18/94 10/31/94
JDA 04/11/96 08/31/96 04/11/95 09/01/95 04/18/94 09/30/94
MCN 04/19/96 08/30/96 04/06/95 09/01/95 04/23/94 12/05/94
LMN 04/11/96 06/29/96 04/06/95 07/20/95 04/21/94 09/14/94
LGS 04/09/96 06/30/96 04/12/95 07/19/95 04/15/94 09/14/94
LGR 04/10/96 06/27/96 04/17/95 08/30/95 04/15/94 09/14/94
RIS 04/22/96 08/19/96 04/10/95 08/21/95

no sampling

  Data Source

 Site

Agency Collecting Data

JDA and BO1

National Marine Fisheries Service (NMFS)

IHR Army Corp of Engineers contracts Washington Dept. of Fish and Wildlife (WDFW)
LGR, LMN, and MCN  Washington Dept. of Fish and Wildlife (WDFW)
LGS Dam  Oregon Department of Fish and Wildlife (ODFW)
RIS  Chelan Co. PUD contracts Washington Dept. of Fish and Wildlife (WDFW)

  How Frequently Data is Updated

The sampling data is only updated if an error is found.  The data is proofed at the sites and by FPC's GBT Monitoring Coordinator, Jerry McCann.


Page last updated on: February 27, 2015

This website designed for 1024 x 768 or higher resolution. Questions and comments to: webmaster@fpc.org

[ Home ] [ Adult ] [ Smolt ] [ Spawning ] [ River ] [ Hatchery] [ Survival] [ Travel times] [ Documents ]