Nearshore Habitat Use by Juvenile Chinook Salmon in Lentic ...

TABLE 6.—Diet composition of juvenile Chinook salmon along the shoreline of Lake Washington and at three tributary mouths of Lake Washington,
April 2003. n = number of stomach samples analyzed; the range of Chinook salmon lengths is also given; %N = percent number; %O = percent
occurrence; %W = percent weight; %IRI = percent index of relative importance.
47
Lake shoreline Kennydale Beach trib. May Cr. Taylor Cr.
n = 20, range = 45-84 mm FL n = 6, range = 59-73 mm FL n = 11, range = 56-74 mm FL n = 10, range = 44-62 mm FL
Prey group %N %O %W %IRI %N %O %W %IRI %N %O %W %IRI %N %O %W %IRI
Insecta
Diptera
Chironomid pupae and adults 93.4 95 92.9 97.3 92.7 100 74.7 92.2 73.3 90.9 65.1 75.8 76.8 80 82.0 88.8
Chironomid larvae 2.7 55 0.7 1.0 5.7 50.0 14.7 5.6 8.5 90.9 17.1 14.0 10.5 60 2.6 5.5
Other aquatic diptera 0.1 5 0.05 0.01 0 0 0 0 0.8 27.3 1.4 0.4 0 0 0 0
Ephemeroptera 0 0 0 0 0 0 0 0 3.7 54.5 4.0 2.5 1.1 10 1.1 0.1
Collembola 0.4 15 0.1 0.0 0.5 33.3 0.3 0.1 2.7 36.4 1.3 0.9 2.1 10 0.2 0.2
Other aquatic insects 0.1 5 0.02 0.01 0 0 0 0 2.4 36.4 1.6 0.9 0 0 0 0
Homoptera (Aphididae) 0 0 0 0 0.5 33.3 1.0 0.3 0 0 0 0 0 0 0 0
Other terrestrial insects 1.1 15 0.6 0.1 0.3 33.3 8.9 1.7 2.1 36.4 2.0 0.9 4.2 30 6.5 2.2
Crustacea
Cladocera - Daphnia 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Other crustaceans 0.2 10 0.7 0.05 0.2 16.7 0.4 0.05 0.3 9.1 0.5 0.04 0 0 0 0
Hydrachnida 1.0 25 0.3 0.2 0 0 0 0 0.8 18.2 0.01 0.1 1.1 10 1.4 0.2
Oligochaeta 0 0 0 0 0 0 0 0 0.3 9.1 0.2 0.02 0 0 0 0
Other 1.0 40 4.6 1.2 0 0 0 0 5.1 63.6 6.6 4.5 4.2 40 6.3 2.9