2012 trip by trip results

For each of the three trips carried out in 2012 two tables are shown; the first provides a summary of fish examined in the laboratories, while the second details the levels of lice observed on these fish.

(It should be noted that in contrast to 2010 and 2011, when four trips were carried out, no wild sampling trip took place at the end of March, 2012. It is thus important to look at the second trips in 2010 or 2011 when comparing figures with "Trip 1" of this year, etc.)


Results from Trip 1: 23rd April - 27th April, 2012

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 1131 33.5 0.31
Chum salmon 1113 39.8 0.57

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 5.0% [3.8 - 6.3] 1.2 [1-4] 0.06
C. clemensi 8.4% [6.8 - 10.0] 1.2 [1-3] 0.10
Chum L. salmonis 10.0% [8.2 - 11.7] 1.3 [1-4] 0.13
C. clemensi 15.1% [13.0 - 17.2] 1.4 [1-10] 0.21

Results from Trip 2: 28th May - 1st June, 2012

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 1557 54.8 1.65
Chum salmon 1564 58.4 2.19

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 13.7% [12.0 - 15.4] 1.2 [1-3] 0.16
C. clemensi 17.5% [15.6 - 19.4] 1.2 [1-6] 0.21
Chum L. salmonis 24.1% [22.0 - 26.2] 1.3 [1-5] 0.31
C. clemensi 28.1% [25.9 - 30.4] 1.4 [1-6] 0.41

Results from Trip 3: 23rd June - 27th June, 2012

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 1069 67.5 3.09
Chum salmon 774 74.7 4.86

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 7.8% [6.2 - 9.4] 1.2 [1-4] 0.09
C. clemensi 3.2% [2.1 - 4.2] 1.1 [1-3] 0.03
Chum L. salmonis 9.4% [7.4 - 11.5] 1.3 [1-7] 0.12
C. clemensi 5.4% [3.8 - 7.0] 1.1 [1-2] 0.06

The summaries provided above follow a format used by DFO in a previous project to allow for comparison. Details of that project together with trip summaries from 2005-09 can be found here.

If you are unfamiliar with any of the terms used in these tables (e.g. "prevalence", "intensity", etc.) an explanation can be found in one of the frequently asked questions around the BAMP project.

photo by MHC

photo by Brent Hargreaves.