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Main Title Age and Growth of Brown Trout (Salmo trutta) and Sculpin (Cottus SPP.) as it Relates to Eutrophication in the Jordan and Asuable Rivers.
Author Quick., Robert F. ;
CORP Author Michigan State Univ., East Lansing. Dept. of Fisheries and Wildlife.
Year Published 1971
Report Number DI-14-31-0001-3153; OWRR-C-1663(3153) ;OWRR-C-2205(3386); W72-08060 ; OWRR-C-1663(3153) (1)
Stock Number PB-231 962
Additional Subjects Fishes ; Trout ; Food chains ; Water pollution ; Nutrients ; Growth curves ; Limnology ; Theses ; Rivers ; Michigan ; Ecology ; Jordan River ; Ausable River ; Indicator species ; Eutrophication ; Sculpins ; Cottus bairdi ; Salmo trutta ; Cottus cognatus ; Water pollution effects(Animals)
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NTIS  PB-231 962 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 98p
Abstract Three sites on two rivers in Michigan were chosen to represent a gradient of eutrophication. Brown trout (Salmo trutta) were found in each site and 1,361 specimens were collected by electrofishing between March and November 1970. In the same period, 644 specimens of mottled sculpin (Cottus bairdi) were collected in the most eutrophic sites, and 556 specimens of slimy sculpin (Cottus cognatus) were collected in the two least eutrophic sites. In streams common to both sculpin species, mottled sculpin occurred in a relative abundance ratio of 10:1 with slimy sculpin. Brown trout were aged by scale annuli interpretation, and sculpin were aged by otolith analysis. Growth curves constructed for the seven fish populations indicated that for every species, fish of comparable age were larger in the more eutrophic streams. Instantaneous growth rates for the populations in each species differed only in the first year, with higher rates being exhibited by the populations in the most eutrophic environments.
Supplementary Notes Also available OWRR-C-2205(3386)(2).
NTIS Title Notes Master's thesis.
PUB Date Free Form 1971
Category Codes 6F; 13B; 8H; 57H; 68D; 48G
NTIS Prices PC A05/MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 326590005
Origin NTIS
Type CAT