AbstractThis study examined the sublethal toxicity of 2‐(thiocyanomethylthio)benzothiazole (TCMTB), a wood preservative used in British Columbia's lumber industry, to coho salmon,Oncorhynchus kisutch.Swimming performance, oxygen consumption, and blood lactate levels were used as indicators of sublethal TCMTB toxicity. Assessment of swimming performance consisted of subjecting preexposed (48 h) fish to a series of increasing velocity increments within an annular swim chamber. An automated respirometer apparatus was used to measure oxygen consumption rates. Blood lactate levels were assayed upon termination of the respirometer trials. Reductions in critical swimming speed and elevations in blood lactate occurred in a concentration‐dependent manner with thresholds of 10 and 7.5 μg/L, respectively. A similar concentration‐dependent response was not observed with respect to oxygen consumption
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