||Toxaphene effects on reproduction, growth, and mortality of brook trout /
Mayer, F. L. ;
Mehrle, Jr., Paul M. ;
Dwyer., William P.
||Fish and Wildlife Service, Columbia, Mo. Fish-Pesticide Research Lab.;Environmental Research Lab., Duluth, Minn.
|| Available from National Technical Information Service,
Fishes--Effect of water pollution on. ;
Trout--Diseases and pests. ;
Chlorine aliphatic compounds ;
Aquatic animals ;
Water pollution ;
Salvelinus fontinalis ;
Water pollution effects(Animals)
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||viii, 42 pages : illustrations ; 28 cm.
Yearling brook trout (Salvelinus fontinalis) were continuously exposed to toxaphene (0, 39, 68, 139, 288, and 502 ng/l) in a flow-through diluter system. Day length and water temperature were altered monthly to correspond to natural conditions. Adult growth was reduced in the 288 and 502 ng/l toxaphene exposures, and the added stress of spawning activities caused extensive mortalities in these concentrations. The numbers of eggs spawned and percent viability were inversely related to increasing toxaphene concentrations. All groups of fry exposed to toxaphene had reduced rates of growth and survival. Biochemical investigations on fry backbones demonstrated that bone collagen may be a sensitive indicator of normal and abnormal growth and development prior to being observed in the whole fish. Toxaphene was accumulated by brook trout 5,000 to 76,000 times that in the water and the more chlorinated isomers of toxaphene were preferentially stored.
Prepared for U.S. Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory, Duluth, Minnesota under Contract no. EPA-IAG-0153 (D). Includes bibliographical references (pages 36-41). Microfiche.