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Haywood, Carl N. (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume 75 (1987)

Rudsam, Lars G.; Trapp, Todd W.
Diel patterns of behavior and habitat utilization of cisco (Coregonus artedii) in two Wisconsin lakes,   pp. 70-78 PDF (3.4 MB)


Page 71

  71Die! Patterns of Cisco 
m to 30-m depths). In addition, we report M, 110 beam width) during day,
night, data on did feeding patterns obtained dawn and dusk periods. The transducer
from analyses of stomach content of fish was towed 0.3-0.5 m below the surface
caught during different time periods, from an "A-frame" in front
of a small
 boat. Towing speed was approximately 
 Study Area 1.5-2 m/s. Transects were made along the Pallette and Trout Lakes
are located in longest diameter of the lake and perpenVilas County in Wisconsin's
Northern diculam to this diameter. 
Highland Lake District (46.0°N, Seven 4-m wide multifilament vertical
89.7°W). Pallette Lake is a 69 ha seepage gill nets were used for
the
catch, each with lake with a mean depth of 9.7 m and a a different mesh size
(19, 32, 38, 51, 64, maximum depth of 19.8 m. It has a low 89 and 127-mm
stretch mesh). The seven alkalinity (0.15 mmol/l) and can be con- nets were
set in a straight line for 48 hours sidered oligotmophic. Trout Lake is a
1605 from the surface to the bottom along the ha drainage lake separated
into four 14-m depth contour in Pallette Lake basins. Our investigation was
conducted (13-15 July) and along the 18-m depth in the largest and deepest
of these basins contour in Trout Lake (10-12 Aug.). with an area of 770 ha,
a mean depth of Trout Lake was fished for an additional 18 m, and a maximum
depth of 35.7 m. 24 hours with 32-mm and 38-mm mesh Trout Lake is more productive
than nets suspended from the surface and with Pallette and has an alkalinity
of 0.82 19, 51, 64, 89 and 127-mm mesh nets susmmol/l. pended from 13-m depth
to 28-m depth 
 (17—18 Aug.). The nets were serviced apMaterials and Methods proximately
every six hours (Table 1). 
 Pallette Lake was investigated on 13—15 Fish were identified and
their
length July 1981 and Trout Lake on 10-12 measured. Depth of catch was noted
in 1August, 17-18 August, and 2-3 Sep- m intervals. When available, 10 fish
of tembem 1981. The lakes were surveyed each 1-cm-length class were weighed
in with a 70 kHz echo sounder (Simmad EY- the field using a spring balance.
Stomachs 
Table 1. Median depth of catch for young-of-year (0+), I + to 11+, and older
cisco in 
Trout Lake. The 25 and 75 percentiles are given in parentheses. Sunrise at
0455, 11 
August, and 0503, l7August. Sunset at 2114,11 August and 2105, l7August.
Time period 
Evening 
Night 
Morning 
Day 
Depth 
Age group 
sampled 
(m) 
median N 
median N 
median 
N 
median 
N 
10-12 August: 
Time 
1600-2130 
2130-0325 
0325-1000 
1000-1600 
0+ 
0-18 
— 0 
14 (14-14) 2 
— 
0 
— 
0 
1-11+ 
0-18 
15(15-15) 3 
16 (14-17) 12 
15(7-17) 
3 
— 
0 
older 
0-18 
16(15-16) 3 
14(14-16)14 
15(12-15) 
5 
— 
0 
17—18 August: 
Time 
1630-2200 
2200-0730 
0730-1630 
0+ 
13-28 
 17 1 
14 (13-18) 12 
19 (19-19) 
4 
1-11+ 
0-28 
18 (12-19) 13 
16 (14-19) 33 
— 
0 
older 
0-28 
26 (22-27) 19 
26 (22-27) 26 
26 (25-26) 16 


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