2011 trip by trip results

For each of the four trips in 2011 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.


Results from Trip 1: 27th March - 31st March, 2011

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 833 30.6 0.24
Chum salmon 237 35.9 0.42

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 1.1% [0.4 - 1.8] 1.0 0.01
C. clemensi 1.0% [0.3 - 1.6] 1.0 0.01
Chum L. salmonis 1.3% [-0.2 - 2.7] 1.0 0.01
C. clemensi 2.1% [0.3 - 3.9] 1.4 [1-2] 0.03

Results from Trip 2: 25th April - 29th April, 2011

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 977 36.3 0.51
Chum salmon 579 42.1 0.93

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 2.7% [1.7 - 3.7] 1.1 [1-2] 0.03
C. clemensi 9.2% [7.4 - 11.0] 1.2 [1-3] 0.11
Chum L. salmonis 6.7% [4.7 - 8.8] 1.2 [1-2] 0.08
C. clemensi 14.7% [11.8 - 17.6] 1.5 [1-5] 0.22

Results from Trip 3: 24th May - 29th May, 2011

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 1559 56.3 2.03
Chum salmon 481 55.6 2.35

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 4.5% [3.5 - 5.5] 1.1 [1-4] 0.05
C. clemensi 12.8% [11.3 - 14.5] 1.2 [1-5] 0.15
Chum L. salmonis 7.1% [4.8 - 9.4] 1.1 [1-3] 0.08
C. clemensi 17.5% [14.1 - 20.9] 1.3 [1-4] 0.23

Results from Trip 4: 20th June - 24th June, 2011

Number examined Average length
(mm)
Average weight
(g)
Pink salmon 1005 65.4 3.12
Chum salmon 252 67.4 4.20

Prevalence
[95% CI]
Intensity
[range]
Abundance
Pink L. salmonis 1.9% [1.1 - 2.7] 1.1 [1-2] 0.02
C. clemensi 3.6% [2.4 - 4.7] 1.2 [1-2] 0.04
Chum L. salmonis 4.0% [1.6 - 6.4] 1.3 [1-3] 0.05
C. clemensi 5.2% [2.4 - 7.9] 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.