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A Chemical Selectively Lethal to Squawfish (Ptychocheilus oregonensis and P. umpquae)
Author(s) -
Macphee Craig,
Ruelle Richard
Publication year - 1969
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1969)98[676:acslts]2.0.co;2
Subject(s) - salvelinus , oncorhynchus , fontinalis , salmo , zoology , biology , chemistry , fish <actinopterygii> , potency , ecology , toxicology , trout , fishery , in vitro , biochemistry
A piscicide, 1,1′‐methylenedi‐2‐naphthol, is lethal to Ptychocheilus oregonensis and P. umpqua at concentrations 3 to 100 times more toxic to squawfish than to salmonids. Selectivity of the chemical varies with the tolerances of the species and its potency varies positively with concentration and temperature. For a thermal range of 18.3 to 10.0 C, the minimum LC 100 is 0.006 to 0.015 ppm for P. oregonensis and 0.01 to 0.03 ppm for P. umpquae. Within these ranges the mean survival time varies from 6 to 31 hr for P. oregonensis and 6 to 20 hr for P. umpquae. In 96‐hour assays at similar temperatures, the maximum LC 0 is about 0.3 ppm for Salvelinus fontinalis, 0.1 ppm for Oncorhynchus tshawytscha, and from 0.6 to 1.3 ppm for O. kisutch and Salmo gairdneri depending on the water temperature. One domestic sheep and two ducks showed no ill effects when forced to drink water containing 10 ppm of the chemical for 1 week. A field application in a small lagoon containing several species of fish killed only P. oregonensis.