To: Sue Madsen, Skagit Fisheries Enhancement Group From: Eric Beamer, Skagit River System Cooperative Date: December 18, 2014 Subject: McElroy Slough beach seine summary results for unmarked juvenile Chinook salmon: 2014 Sites and Effort Fifty-four beach seine sets were made in McElroy Slough from February through June, 2014 (Table 1). Sites up- and downstream of the tidegate site were sampled (Figure 1) and are consistent with sites sampled in previous years. Sampling frequency was once in February and twice per month in March through June. The sampling period is designed to capture the entire period when juvenile Chinook salmon use estuarine habitats in Puget Sound. In 2014, per a recommendation after the 2011 beach seining effort, we installed data loggers up and downstream of the tidegate in order to measure variables influenced by tidegate operation: Water surface elevation (WSE) when the tidegate doors close, WSE up and downstream of the tidegate, water temperature up and downstream of the tidegate, and water salinity up and downstream of the tidegate. Table 1. Number of beach seine sets made by sampling date and position relative to the tidegate in McElroy Slough, 2014. Sampling Date downstream of tidegate upstream of tidegate 26-Feb-14 3 3 10-Mar-14 3 3 26-Mar-14 3 3 08-Apr-14 3 3 23-Apr-14 3 3 06-May-14 3 3 22-May-14 3 3 04-Jun-14 3 3 20-Jun-14 3 3 Grand Total 27 27
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To: Sue Madsen, Skagit Fisheries Enhancement Group
From: Eric Beamer, Skagit River System Cooperative
Date: December 18, 2014
Subject: McElroy Slough beach seine summary results for unmarked juvenile Chinook
salmon: 2014
Sites and Effort
Fifty-four beach seine sets were made in McElroy Slough from February through June, 2014
(Table 1). Sites up- and downstream of the tidegate site were sampled (Figure 1) and are
consistent with sites sampled in previous years. Sampling frequency was once in February and
twice per month in March through June. The sampling period is designed to capture the entire
period when juvenile Chinook salmon use estuarine habitats in Puget Sound.
In 2014, per a recommendation after the 2011 beach seining effort, we installed data loggers up
and downstream of the tidegate in order to measure variables influenced by tidegate operation:
Water surface elevation (WSE) when the tidegate doors close,
WSE up and downstream of the tidegate,
water temperature up and downstream of the tidegate, and
water salinity up and downstream of the tidegate.
Table 1. Number of beach seine sets made by sampling date and position relative to the tidegate in
McElroy Slough, 2014.
Sampling Date downstream of tidegate upstream of tidegate
26-Feb-14 3 3
10-Mar-14 3 3
26-Mar-14 3 3
08-Apr-14 3 3
23-Apr-14 3 3
06-May-14 3 3
22-May-14 3 3
04-Jun-14 3 3
20-Jun-14 3 3
Grand Total 27 27
Figure 1. Location of beach seine sampling sites in McElroy Slough. Yellow dots are located downstream
of the tidegate site. White triangles are located upstream of the tidegate site.
Fish Assemblage
We caught over 5,000 fish representing eleven different species in 2014 (Table 2).
Table 2. Total catch by species at McElroy Slough sites February 26 through June 20, 2014. Mean catch