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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Fig. 1. National Pesticide Monitoring Program (NPMP) stations (numbered circles) where freshwater fish were collected for organochlorine
residue analyses. (Unnumbered circles represent stations not sampled during 1976-79.)
those reported in the past: common carp represented 22%
of the samples and were collected at 35% of the stations;
channel catfish, 5 % of the samples and 11 % of the stations;
largemouth bass, 7% and 19%; white sucker, 8% and
13 %; and yellow perch, 3 % and 8 %. Collectively, these
five species represented 45 % of the 620 samples analyzed.
The proportional representation of the five major species
was lower than reported for 1970-74; consequently, the
data set was even more heterogeneous than before, and
additional species Were numerous. Other frequently col-
lected species for the period 1976-79 included smallmouth
buffalo, largescale sucker, walleye, lake trout, bloater, and
white catfish. When the data set was reduced to the 102
stations with continuous data from 1976 through 1979,
there were 54 taxa; when it was trimmed further to 78 sta-
tions and the 1974 data were added, there were 52 taxa.
The proportional representation of the five major species
in the three data sets was nearly identical; collectively, they
represented 45% of the total 1976-79 samples, 44% of the
samples in the 102-station subset (1976-79), and 46%0 of
the 78-station subset (1974-79). Conclusions regarding
temporal trends that are drawn from all the data or from
either subset should therefore not be overly biased by dif-
ferences in the proportional species composition of the data
sets.
Year-to-year continuity at the stations declined slightly
compared with that reported for 1970-74 (Schmitt et al.
1981). At the 102 stations for which data are available for
both 1976-77 and 1978-79, one species was common to both
collections at 79 stations (78%); two or more identical
species were collected in both periods at 44 stations (43%);
and three identical species were taken in both collection
periods at one station (No. 115). For the 78-station subset
spanning three collection periods (1974, 1976-77, and
1978-79), continuity was poorer: At 46 stations (59%) one
species was common to all three collection periods; at 16
stations (20%) there were two such species; and at no sta-
tions were three species common to all three collection