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Main Title Effects of Chlorpyrifos on the Diet and Growth of Larval Fathead Minnows, 'Pimephales promelas', in Littoral Enclosures.
Author Brazner, J. C. ; Kline, E. R. ;
CORP Author Environmental Research Lab.-Duluth, MN. ;Wisconsin Univ.-Superior. Center for Lake Superior Environmental Studies.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/250;
Stock Number PB91-144956
Additional Subjects Water pollution effects(Animals) ; Dursban ; Feeding behavior ; Littoral zone ; Freshwater fishes ; Growth ; Larvae ; Body weight ; Reprints ; Pimephales promelas
Library Call Number Additional Info Location Last
NTIS  PB91-144956 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
A series of 12 littoral enclosures constructed within a 2 ha, mesotrophic pond near Duluth, Minnesota were used to determine if sublethal concentrations of the insecticide chlorpyrifos (0,0,-diethyl 0-(3,5,6-trichloro-2-pyridyl) phosphorothioate) could lead to changes in the diet and growth of fathead minnow larvae. Chlorpyrifos was added to the enclosures at nominal concentrations of 0.0, 0.5, 5.0, and 20.0 microgram/L in a single application on June 16, 1986. Growth rates of larvae were significantly reduced in the treated enclosures during the 32-d study period. The most dramatic differences in the mean size of larvae from the four treatment groups were observed 15 d posttreatment. These differences corresponded to the most significant reductions in cladoceran, copepod, rotifer, and chironomid populations in the treated enclosures. These results indicate that toxicity to chlorpyrifos-sensitive invertebrate forage species forced dietary changes that led to reduced growth of native fathead minnow larvae in the treated enclosures.