7942

• UCREFRP Catalog Number: 7942
• Author: Schmitt, C. J., et al.
• Title: National Pesticide Monitoring Program
• USFW Year: 1983.
• USFW - Doc Type: Organochlorine Residues in Freshwater Fish, 1976-79.
• Copyright Material: NO

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Table 2. Occurrence of the five most frequently collected fish species, and of all species combined, in the NPMP data
set, 1974-79.

Species and
collection period
All (113)
Samples Stations
No. %C No. %d Number of stations represented
102a
Samples Stations
No. %e No. %d
78b
Samples
No. %e

Stations
No. %d
Common carp
1974 59 17.6 42 48.3 - - - - 57 19.1 41 52.6
1976-77 63 20.7 36 34.0 60 20.4 34 33.3 46 20.4 26 33.3
1978-79 74 23.5 39 36.1 71 23.9 37 36.3 55 24.1 28 35.9
1974-79 196 20.5 117 39.0 - - - - 158 21.0 95 40.6
Channel catfish
1974 37 11.0 32 36.8 - - - - 35 11.7 30 38.5
1976-77 19 6.2 15 14.2 19 6.5 15 14.7 16 7,1 13 16.7
1978-79 12 3.8 8 7.4 10 3.4 7 6.9 8 3.5 5 6.4
1974-79 68 7.1 55 18.3 - - - - 59 7.8 48 20.5
Largemouth bass
1974 25 7.5 19 21.8 - - - - 21 7.0 16 20.5
1976-77 20 6.6 20 18.9 20 6.8 20 19.6 15 6.6 15 19.2
1978-79 21 6.7 21 19.4 20 6.7 20 19.6 16 7.0 16 20.5
1974-79 66 6.9 60 19.9 - - -- - 52 6.9 47 20.1
White sucker
1974 15 4.5 12 10.5 - - - - 14 4.7 11 14.1
1976-77 24 7:9 13 12.3 22 7.5 12 11.8 16 7.1 9 11.5
1978-79 29 9.2 15 13.9 29 9.8 15 14.7 18 7.9 9 11.5
1974-79 68 7.1 40 13.3 - - - - 48 6.4 29 12.4
Yellow perch
1974 25 7.5 14 6.1 - - - - 21 7.0 12 15.4
1976-77 7 2.3 6 5.7 6 2.0 5 4.9 6 2.7 5 6.4
1978-79 11 3.5 10 9.3 11 3.7 10 9.8 11 4.8 10 12.8
1974-79 43 4.5 30 10.0 - - - - 38 5.0 27 11.5
Major species (5)
1974 161 48.1 - - - - - - 148 49.5 - -
1976-77 133 43.6 - - 127 43.2 - - 99 43.8 - -
1978-79 147 46.1 - - 141 47.5 - - 108 47.4 - -
1974-79 441 46.2 - - - - - - 355 47.1 - -
All speciese
1974 335 35.1 87 77.0 - - - - 299 89.3 78 90.0
1976-77 305 31.9 106 93.8 294 96.4 102 96.2 226 74.1 78 73.6
1978-79 315 33.0 108 95.6 297 94.3 102 92.3 228 72.4 78 72.2
1974-79 955 100.0 113 100.0 - - - - 753 78.8 78 69.0
aStations where at least one sample was taken in each collection period, 1976-79.
bStations where at least one sample was taken in each collection period, 1974 and 1976-79 (no samples collected in 1975)
ePercentage of samples taken in each collection period or periods for indicated data set.
dPercentage of station-years in collection period or periods for indicated data set.
eFor all-species summary, percentages are of total samples taken or of stations sampled in the indicated collection period.
periods. As reported previously (Schmitt et al. 1981), much
geographic discontinuity stems from the lack of truly
ubiquitous fish species that can be collected at all of the
NPMP stations. Temporal discontinuity results from the
limited time and resources available for making collections,
and from the inherent variability of the large-river environ-
ment characteristic of most NPMP stations. Large rivers
are notoriously difficult and expensive to sample, and
typically display extreme temporal variability. The mixed-
model ANOVA used to test time-period main effects was
selected because it enables one to deal with such temporally
variable species composition (Schmitt 1981).